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Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal
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Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal

2024-11-13 This document shows how to configure a Network Address Translation Traversal (NAT-T) between Cisco VPN Clients located behind a Port Address Translati

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This document shows how to configure a Network Address Translation Traversal (NAT-T) between Cisco VPN Clients located behind a Port Address Translation (PAT)/NAT device and a remote Cisco VPN Concentrator. NAT-T can be used between VPN Clients and a VPN Concentrator, or between concentrators behind a NAT/PAT device. NAT-T can also be used when connecting to a Cisco router running Cisco IOS® Software and PIX Firewall; however, these configurations are not discussed in this document.

There are no specific requirements for this document.

The information in this document is based on these software and hardware versions:

  • Cisco VPN 3000 Concentrator 4.0(1)B

  • Cisco VPN Clients: 3.6.1 and 4.0(3) Rel

  • Cisco PIX Firewall (PAT device) version 6.3(3)

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

This document uses this network setup:

VPN Clients PCs ( 10.10.10.2 10.10.10.3 ) PIX Firewall . PIX scenario simply PAT device , conducts PAT addresses 171.69.89.78 . device able PAT multiple internal connections .   VPN 3000 Concentrator public address is is 172.16.172.50 . following example is demonstrates demonstrates configure clients concentrator NAT – T IKE negotiation .

For more information on document conventions, refer to the Cisco Technical Tips Conventions.

After NAT-T negotiation is completed, the initiator can use any random User Datagram Protocol (UDP) port (Y). The destination port must be UDP 4500, as in UDP (Y, 4500), and the responder uses UDP (4500, Y). All subsequent Internet Key Exchange (IKE) negotiations and rekeying are done on these ports. During NAT-T negotiations, both the IPSec peers negotiate the UDP ports and also determine if they are behind a NAT/PAT device. The IPSec peer behind the NAT/PAT device sends the IPSec-over-UDP NAT keepalive packet to the IPSec peer that is not behind a NAT/PAT device. NAT-T encapsulates IPSec traffic in UDP datagrams, using port 4500, thereby providing NAT devices with port information. NAT-T autodetects any NAT devices, and only encapsulates IPSec traffic when necessary.

When implementing IPSec over NAT translation on the VPN 3000 Concentrator, IPSec over TCP takes first precedence, then NAT-T, and then IPSec over UDP. By default, NAT-T is turned off. You need to enable NAT-T using a checkbox located in NAT Transparency, under the IPSec configuration located under Tunneling Protocols. Also, for a LAN-to-LAN tunnel, you have to turn NAT-T on under the LAN-to-LAN configurations IPSec NAT-T field.

use NAT – T , you is complete complete steps :

  1. Open port 4500 firewall configured VPN Concentrator .

  2. Reconfigure previous IPSec/UDP configurations using port 4500 to a different port.

  3. Choose Configuration > Interfaces > Ethernet, choose second options Fragmentation Policy parameter .

    These options allow traffic to travel across NAT devices that do not support IP fragmentation; they do not impede the operation of NAT devices that do support IP fragmentation.

The relevant configuration output for the PIX is shown here:

PIX Firewall 
pix501(config ) # 
 : Saved 
 : 
 PIX Version 6.3(3 ) 
 nameif ethernet0 outside security0 
 nameif ethernet1 inside security100 
 ip address outside 171.69.89.78 255.255.254.0 
 ip address inside 10.10.10.1 255.255.255.0 
 ... 
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
...
route outside 0.0.0.0 0.0.0.0 171.69.88.1 1
http server enable
http 10.10.10.2 255.255.255.255 inside
...
Cryptochecksum:6990adf6e0e2800ed409ae7364eecc9d
: end

[OK]

This sample configuration assumes that the VPN 3000 Concentrator has already been configured for IP connectivity, and that standard (non-NAT-T) VPN connections have already been established.

enable NAT – T VPN 3000 Concentrator release earlier version 4.1 , chooseConfigurations > System > Tunneling protocols > IPSec > NAT Transparency, then check the IPSec NAT – T option on the concentrator as shown in the example below. The NAT-T option is off by default.

To enable NAT-T on a VPN Concentrator version 4.1 and later, navigate to the same NAT Transparency window by choosing Configuration > Tunneling and Security > IPSec > NAT Transparency.

Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal

To use NAT-T, check Enable Transparent Tunneling. following example is demonstrates demonstrates VPN Client later version 4.0 .

Note :  The same configuration option is available on VPN Client version 3.x.

This section provides information you can use to confirm your configuration is working properly.

Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.

Additional troubleshooting information can be found at IP Security Troubleshooting – Understanding and Using debug Commands.

commands verify PIX configuration :

  • xlate—As shown in the output below, the PIX is using different source ports for the two VPN Clients, but the destination ports are the same. All IPSec data packets are wrapped using UDP port 4500. Subsequent rekeying negotiations also use the same source and destination ports.

    pix501(config ) #xlate
 3 use , 4 is used 
 PAT Global 171.69.89.78 (1025) Local 10.10.10.3(4500)
PAT Global 171.69.89.78(1026) Local 10.10.10.2(4500)
PAT Global 171.69.89.78(4) Local 10.10.10.2(500)

  • show arp— Use command display Address Resolution Protocol ( ARP ) table determine ARP requests processed .

    pix501(config ) #show arp
        outside 171.69.88.3 00d0.0132.e40a
        outside 171.69.88.2 00d0.0133.3c0a
        outside 171.69.88.1 0000.0c07.ac7b
        inside 10.10.10.3 0050.dabb.f093
        inside 10.10.10.2 0001.0267.55cc
pix501(config)#

Once the VPN tunnel is established, right-click on the yellow lock and choose Status. A similar window is shown below. Note that the tunnel port is UDP 4500, which proves that you are using NAT-T.

Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal

Complete these steps:

  1. On the VPN Concentrator, choose Administration > Administrator Session.

    The VPN Client session can be seen under Remote Access Sessions. The example below shows the sessions of the two clients after they have established an IPSec tunnel to the VPN Concentrator. They are both using the public IP address 171.69.89.78 and were assigned 40.1.1.1 and 40.1.1.2, respectively.

    Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal

  2. Double-click on a client user name.

    IPSec / IKE statistics shown , seen example . UDP source port is is client 1029 , destination port 4500 .

    Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal

This section provides information you can use to troubleshoot your configuration.

Note :  Before issuing debug commands, refer to Important Information on Debug Commands.

Note :  Additional PIX troubleshooting information can be found at IP Security Troubleshooting – Understanding and Using debug Commands.

On the PC on which the VPN Client is installed, open the Log Viewer before establishing a connection to the VPN Concentrator. This log output highlights the NAT-T-specific messages:

1      21:06:48.208  10/18/02  Sev=Info/6   DIALER/0x63300002
Initiating connection.
2      21:06:48.218  10/18/02  Sev=Info/4   CM/0x63100002
Begin connection process
3      21:06:48.218  10/18/02  Sev=Info/4   CM/0x63100004
Establish secure connection using Ethernet
4      21:06:48.218  10/18/02  Sev=Info/4   CM/0x63100026
Attempt connection with server "172.16.172.50"
42     21:07:42.326  10/18/02  Sev=Info/6  IKE/0x6300003B
Attempting to establish a connection with 172.16.172.50.
43     21:07:42.366  10/18/02  Sev=Info/4  IKE/0x63000013
SENDING >>> ISAKMP OAK AG (SA, KE, NON, ID, VID, VID, VID, VID, VID)
 to 172.16.172.50
44     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x6300002F
Received ISAKMP packet: peer = 172.16.172.50
45     21:07:42.716  10/18/02  Sev=Info/4  IKE/0x63000014
RECEIVING <<< ISAKMP OAK AG (SA, KE, NON, ID, HASH, VID, VID, VID,
 VID, NAT-D, NAT-D, VID, VID) from 172.16.172.50
46     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000059
Vendor ID payload = 12F5F28C457168A9702D9FE274CC0100
47     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000001
Peer is a Cisco-Unity compliant peer
48     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000059
Vendor ID payload = 09002689DFD6B712
49     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000001
Peer supports XAUTH
50     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000059
Vendor ID payload = AFCAD71368A1F1C96B8696FC77570100
51     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000001
Peer supports DPD
52     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000059
Vendor ID payload = 90CB80913EBB696E086381B5EC427B1F
53     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000001
Peer is supports supports NAT - T
54     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000059
Vendor ID payload = 4048B7D56EBCE88525E7DE7F00D6C2D3C0000000
55     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000001
Peer supports IKE fragmentation payloads
56     21:07:42.716  10/18/02  Sev=Info/5  IKE/0x63000059
Vendor ID payload = 1F07F70EAA6514D3B0FA96542A500306
57     21:07:42.757  10/18/02  Sev=Info/4  IKE/0x63000013
SENDING >>> ISAKMP OAK AG *(HASH, NOTIFY:STATUS_INITIAL_CONTACT, NAT-D,
 NAT-D) to 172.16.172.50
58     21:07:42.767  10/18/02  Sev=Info/5  IKE/0x6300002F
Received ISAKMP packet: peer = 172.16.172.50
59     21:07:42.767  10/18/02  Sev=Info/4  IKE/0x63000014
RECEIVING <<< ISAKMP OAK TRANS *(HASH, ATTR) from 172.16.172.50
60     21:07:42.767  10/18/02  Sev=Info/4  CM/0x63100015
Launch xAuth application
61     21:07:42.967  10/18/02  Sev=Info/4  IPSEC/0x63700014
Deleted all keys
62     21:07:59.801  10/18/02  Sev=Info/4  CM/0x63100017
xAuth application returned
63     21:07:59.801  10/18/02  Sev=Info/4  IKE/0x63000013
SENDING >>> ISAKMP OAK TRANS *(HASH, ATTR) to 172.16.172.50
64     21:08:00.101  10/18/02  Sev=Info/5  IKE/0x6300002F
Received ISAKMP packet: peer = 172.16.172.50
65     21:08:00.101  10/18/02  Sev=Info/4  IKE/0x63000014
RECEIVING <<< ISAKMP OAK TRANS *(HASH, ATTR) from 172.16.172.50
66     21:08:00.101  10/18/02  Sev=Info/5  IKE/0x63000071
Automatic NAT Detection Status:
   Remote end is NOT behind a NAT device
   This end IS behind a NAT device
67     21:08:00.101  10/18/02  Sev=Info/4  CM/0x6310000E
Established Phase 1 SA.  1 Phase 1 SA in the system
68     21:08:00.111  10/18/02  Sev=Info/4  IKE/0x63000013
SENDING >>> ISAKMP OAK TRANS *(HASH, ATTR) to 172.16.172.50
69     21:08:00.111  10/18/02  Sev=Info/5  IKE/0x6300005D
Client sending a firewall request to concentrator
70     21:08:00.111  10/18/02  Sev=Info/5  IKE/0x6300005C
Firewall Policy: Product=Cisco Integrated Client, Capability= 
(Centralized Protection Policy).
71     21:08:00.111  10/18/02  Sev=Info/4  IKE/0x63000013
SENDING >>> ISAKMP OAK TRANS *(HASH, ATTR) to 172.16.172.50
72     21:08:00.122  10/18/02  Sev=Info/5  IKE/0x6300002F
Received ISAKMP packet: peer = 172.16.172.50
73     21:08:00.122  10/18/02  Sev=Info/4  IKE/0x63000014
RECEIVING <<< ISAKMP OAK TRANS *(HASH, ATTR) from 172.16.172.50
74     21:08:00.122  10/18/02  Sev=Info/5  IKE/0x63000010
MODE_CFG_REPLY: Attribute = INTERNAL_IPV4_ADDRESS: , value = 40.1.1.1
75     21:08:00.122  10/18/02  Sev=Info/5  IKE/0x6300000D
MODE_CFG_REPLY: Attribute = MODECFG_UNITY_SAVEPWD: , value = 0x00000000
76     21:08:00.122  10/18/02  Sev=Info/5  IKE/0x6300000D
MODE_CFG_REPLY: Attribute = MODECFG_UNITY_PFS: , value = 0x00000000
77     21:08:00.122  10/18/02  Sev=Info/5  IKE/0x6300000E
MODE_CFG_REPLY: Attribute = APPLICATION_VERSION, value = Cisco Systems, Inc.
/VPN 3000 Concentrator Version 3.6.1.Rel built by vmurphy on Aug 29 2002
 18:34:44
78     21:08:00.122  10/18/02  Sev=Info/5  IKE/0x6300000D
MODE_CFG_REPLY: Attribute = Recieved and using NAT-T port number , value = 
0x00001194
79     21:08:00.132  10/18/02  Sev=Info/4  CM/0x63100019
Mode Config data received
80     21:08:00.142  10/18/02  Sev=Info/5  IKE/0x63000055
Received a key request from Driver for IP address 172.16.172.50, GW IP = 
172.16.172.50
81     21:08:00.142  10/18/02  Sev=Info/4  IKE/0x63000013
SENDING >>> ISAKMP OAK QM *(HASH, SA, NON, ID, ID) to 172.16.172.50
82     21:08:00.142  10/18/02  Sev=Info/5  IKE/0x63000055
Received a key request from Driver for IP address 10.10.10.255, GW IP = 
172.16.172.50
83     21:08:00.142  10/18/02  Sev=Info/4  IKE/0x63000013
SENDING >>> ISAKMP OAK QM *(HASH, SA, NON, ID, ID) to 172.16.172.50
84     21:08:00.172  10/18/02  Sev=Info/5  IKE/0x6300002F
Received ISAKMP packet: peer = 172.16.172.50
85     21:08:00.172  10/18/02  Sev=Info/4  IKE/0x63000014
RECEIVING <<< ISAKMP OAK INFO *(HASH, NOTIFY:STATUS_RESP_LIFETIME) from 
172.16.172.50
86     21:08:00.172  10/18/02  Sev=Info/5  IKE/0x63000044
RESPONDER-LIFETIME notify has value of 86400 seconds
87     21:08:00.172  10/18/02  Sev=Info/5  IKE/0x63000046
This SA has already been alive for 18 seconds, setting expiry to 86382 
seconds from now
88     21:08:00.182  10/18/02  Sev=Info/5  IKE/0x6300002F
Received ISAKMP packet: peer = 172.16.172.50
89     21:08:00.182  10/18/02  Sev=Info/4  IKE/0x63000014
RECEIVING <<< ISAKMP OAK QM *(HASH, SA, NON, ID, ID, NOTIFY:STATUS_RESP_LIFETIME)
 from 172.16.172.50
90     21:08:00.182  10/18/02  Sev=Info/5  IKE/0x63000044
RESPONDER-LIFETIME notify has value of 28800 seconds
91     21:08:00.182  10/18/02  Sev=Info/4  IKE/0x63000013
SENDING >>> ISAKMP OAK QM *(HASH) to 172.16.172.50
92     21:08:00.182  10/18/02  Sev=Info/5  IKE/0x63000058
Loading IPsec SA (Message ID = 0x347A7363 OUTBOUND SPI = 0x02CC3526 INBOUND
 SPI = 0x5BEEBB4C)
93     21:08:00.182  10/18/02  Sev=Info/5  IKE/0x63000025
Loaded OUTBOUND ESP SPI: 0x02CC3526
94     21:08:00.182  10/18/02  Sev=Info/5  IKE/0x63000026
Loaded INBOUND ESP SPI: 0x5BEEBB4C
95     21:08:00.182  10/18/02  Sev=Info/4  CM/0x6310001A
One secure connection established
 96      21:08:00.192   10/18/02   Sev = Info/6   DIALER/0x63300003 
Connection established.
97     21:08:00.332  10/18/02  Sev=Info/5  IKE/0x6300002F
Received ISAKMP packet: peer = 172.16.172.50
98     21:08:00.332  10/18/02  Sev=Info/4  IKE/0x63000014
RECEIVING <<< ISAKMP OAK QM *(HASH, SA, NON, ID, ID, NOTIFY:STATUS_RESP_LIFETIME)
 from 172.16.172.50
99     21:08:00.332  10/18/02  Sev=Info/5  IKE/0x63000044
RESPONDER-LIFETIME notify has value of 28800 seconds
100    21:08:00.332  10/18/02  Sev=Info/4            IKE/0x63000013
SENDING >>> ISAKMP OAK QM *(HASH) to 172.16.172.50
101    21:08:00.342  10/18/02  Sev=Info/5            IKE/0x63000058
Loading IPsec SA (Message ID = 0x2F81FB2D OUTBOUND SPI = 0x3316C6C9 INBOUND 
SPI = 0x6B96ED76)
102    21:08:00.342  10/18/02  Sev=Info/5            IKE/0x63000025
Loaded OUTBOUND ESP SPI: 0x3316C6C9
 103     21:08:00.342   10/18/02   Sev = Info/5             IKE/0x63000026 
Loaded INBOUND ESP SPI: 0x6B96ED76
 104     21:08:00.342   10/18/02   Sev = Info/4             CM/0x63100022 
Additional Phase 2 SA established.
105    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x63700014
Deleted all keys
106    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x63700010
Created a new key structure
107    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x6370000F
Added key with SPI=0x2635cc02 into key list
108    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x63700010
Created a new key structure
109    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x6370000F
Added key with SPI=0x4cbbee5b into key list
110    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x63700010
Created a new key structure
111    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x6370000F
Added key with SPI=0xc9c61633 into key list
112    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x63700010
Created a new key structure
113    21:08:01.203  10/18/02  Sev=Info/4            IPSEC/0x6370000F
Added key with SPI=0x76ed966b into key list
114    21:08:10.216  10/18/02  Sev=Info/6            IKE/0x63000054
Sent a ping on the Public IPSec SA
115    21:08:20.381  10/18/02  Sev=Info/4            IKE/0x63000013
SENDING >>> ISAKMP OAK INFO *(HASH, NOTIFY:HEARTBEAT) to 172.16.172.50
116    21:08:20.381  10/18/02  Sev=Info/6            IKE/0x63000052
Sent a ping on the IKE SA

To view the logs on the VPN Concentrator, choose Monitoring > Filterable Event Log, and select Event Classes IKE, IKEDBG, IKEDECODE, and IPSECDBG with Severities 1 through 13.

2835 10/20/2002 20:22:42.390 SEV=8 IKEDECODE/0 RPT=8190 171.69.89.78 
  Exchange Type :	Oakley Quick Mode
  Flags         :	1   (ENCRYPT )
  Message ID    : 	1b050792
  Length        : 	52
 2838 10/20/2002 20:22:42.390 SEV=8 IKEDBG/0 RPT=9197 171.69.89.78 
RECEIVED Message (msgid=1b050792) with payloads : 
HDR + HASH (8) + NONE (0)
total length : 48
2840 10/20/2002 20:22:42.390 SEV=9 IKEDBG/0 RPT=9198 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
processing hash
2841 10/20/2002 20:22:42.390 SEV=9 IKEDBG/0 RPT=9199 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
loading all IPSEC SAs
 2842 10/20/2002 20:22:42.390 SEV=9 IKEDBG/1 RPT=793 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Generating Quick Mode Key!
2843 10/20/2002 20:22:42.390 SEV=9 IKEDBG/1 RPT=794 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Generating Quick Mode Key!
2844 10/20/2002 20:22:42.400 SEV=4 IKE/173 RPT=41 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
NAT-Traversal successfully negotiated!
IPSec traffic will be encapsulated to pass through NAT devices.
 2847 10/20/2002 20:22:42.400 SEV=7 IKEDBG/0 RPT=9200 171.69.89.78 
 Group [ ciscovpn ] User [ vpnclient2 ] 
 Loading host : 
   Dst : 172.16.172.50 
   Src : 40.1.1.2 
 2849 10/20/2002 20:22:42.400 SEV=4 IKE/49 RPT=63 171.69.89.78 
 Group [ ciscovpn ] User [ vpnclient2 ] 
 Security negotiation complete User ( vpnclient2 ) 
 Responder , Inbound SPI = 0x350f3cb1 , Outbound SPI = 0xc74e30e5 
 2852 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/6 RPT=309 
 IPSEC key message parse - msgtype is err 1 , Len 704 , vers 1 , pid 00000000 , seq 0 , err 0 
 , type 2 , mode 1 , state 320 , label 0 , pad 0 , spi c74e30e5 , encrKeyLen 24 , hashKe 
 yLen 16 , ivlen 8 , alg 2 , hmacAlg 3 , lifetype 0 , lifetime1 21 , lifetime2 0 , dsId 
 0 
 2856 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/1 RPT=1137 
 Processing KEY_ADD msg ! 
 2857 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/1 RPT=1138 
 key_msghdr2secassoc is configured ( ): Enter 
 2858 10/20/2002 20:22:42.400 SEV=7 IPSECDBG/1 RPT=1139 
 USER filter is configured configured 
 2859 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/1 RPT=1140 
 KeyProcessAdd : Enter 
 2860 10/20/2002 20:22:42.400 SEV=8 IPSECDBG/1 RPT=1141 
 KeyProcessAdd : Adding outbound SA 
 2861 10/20/2002 20:22:42.400 SEV=8 IPSECDBG/1 RPT=1142 
 KeyProcessAdd : src 172.16.172.50 mask 0.0.0.0 , DST 40.1.1.2 mask 0.0.0.0 
 2862 10/20/2002 20:22:42.400 SEV=8 IPSECDBG/1 RPT=1143 
 KeyProcessAdd : FilterIpsecAddIkeSa success 
 2863 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/6 RPT=310 
 IPSEC key message parse - msgtype 3 , Len is err 376 , vers 1 , pid 00000000 , seq 0 , err 0 
 , type 2 , mode 1 , state 32 , label 0 , pad 0 , spi 350f3cb1 , encrKeyLen 24 , hashKey 
 Len 16 , ivlen 8 , alg 2 , hmacAlg 3 , lifetype 0 , lifetime1 21 , lifetime2 0 , dsId 0 
 2866 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/1 RPT=1144 
 Processing KEY_UPDATE MSG ! 
 2867 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/1 RPT=1145 
 Update inbound SA addresses 
 2868 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/1 RPT=1146 
 key_msghdr2secassoc ( ): Enter 
 2869 10/20/2002 20:22:42.400 SEV=7 IPSECDBG/1 RPT=1147 
 USER filter is configured configured 
 2870 10/20/2002 20:22:42.400 SEV=9 IPSECDBG/1 RPT=1148 
 KeyProcessUpdate : Enter 
 2871 10/20/2002 20:22:42.400 SEV=8 IPSECDBG/1 RPT=1149 
 KeyProcessUpdate : success 
 2872 10/20/2002 20:22:42.400 SEV=8 IKEDBG/7 RPT=63 
 IKE is got got KEY_ADD MSG SA : SPI = 0xc74e30e5 
 2873 10/20/2002 20:22:42.400 SEV=8 IKEDBG/0 RPT=9201 
 pitcher : rcv KEY_UPDATE , spi 0x350f3cb1 
 2874 10/20/2002 20:22:42.400 SEV=4 IKE/120 RPT=63 171.69.89.78 
 Group [ ciscovpn ] User [ vpnclient2 ] 
 PHASE 2 COMPLETED ( msgid=1b050792 ) 
 2875 10/20/2002 20:22:42.430 SEV=8 IKEDECODE/0 RPT=8191 171.69.89.78 
 ISAKMP HEADER : 	 ( Version 1.0 ) 
   Initiator Cookie(8 ): 	 C5 A0 F0 8B 69 60 D7 47 
   Responder Cookie(8 ): 	 48 65 B1 6F 36 1F 9D 3A 
   Payload   : 	 HASH ( 8) 
   Exchange Type : 	 Oakley Quick Mode 
   Flags          : 	 1    ( ENCRYPT ) 
   Message ID     : 	 cf9d1420 
   Length         : 	 52 
 2882 10/20/2002 20:22:42.430 SEV=8 IKEDBG/0 RPT=9202 is RECEIVED 171.69.89.78 
 RECEIVED Message ( msgid = cf9d1420 ) payloads : 
 HDR + HASH ( 8) + ( 0 ) 
 total length : 48 
 2884 10/20/2002 20:22:42.430 SEV=9 IKEDBG/0 RPT=9203 171.69.89.78 
 Group [ ciscovpn ] User [ vpnclient2 ] 
 processing hash 
 
 2885 10/20/2002 20:22:42.430 SEV=9 IKEDBG/0 RPT=9204 171.69.89.78 
 Group [ ciscovpn ] User [ vpnclient2 ] 
 loading IPSEC SAs 
 2886 10/20/2002 20:22:42.430 SEV=9 IKEDBG/1 RPT=795 171.69.89.78 
 Group [ ciscovpn ] User [ vpnclient2 ] 
 Generating Quick Mode Key ! 
 2887 10/20/2002 20:22:42.440 SEV=9 IKEDBG/1 RPT=796 171.69.89.78 
 Group [ ciscovpn ] User [ vpnclient2 ] 
 Generating Quick Mode Key ! 
 2888 10/20/2002 20:22:42.440 SEV=4 is RPT=42 IKE/173 RPT=42 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
NAT-Traversal successfully negotiated!
IPSec traffic will be encapsulated to pass through NAT devices.
2891 10/20/2002 20:22:42.440 SEV=7 IKEDBG/0 RPT=9205 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Loading subnet:
  DST: 0.0.0.0  mask: 0.0.0.0
  Src: 40.1.1.2
2893 10/20/2002 20:22:42.440 SEV=4 IKE/49 RPT=64 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Security negotiation complete for User (vpnclient2)
Responder, Inbound SPI = 0x2a2e2dcd, Outbound SPI = 0xf1f4d328
2896 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/6 RPT=311 
IPSEC key message parse - msgtype 1, Len 704, vers 1, pid 00000000, seq 0, err 0
, type 2, mode 1, state 320, label 0, pad 0, spi f1f4d328, encrKeyLen 24, hashKe
yLen 16, ivlen 8, alg 2, hmacAlg 3, lifetype 0, lifetime1 21, lifetime2 0, dsId 
0
2900 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/1 RPT=1150 
Processing KEY_ADD MSG!
2901 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/1 RPT=1151 
key_msghdr2secassoc(): Enter
2902 10/20/2002 20:22:42.440 SEV=7 IPSECDBG/1 RPT=1152 
No USER filter configured
2903 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/1 RPT=1153 
KeyProcessAdd: Enter
2904 10/20/2002 20:22:42.440 SEV=8 IPSECDBG/1 RPT=1154 
KeyProcessAdd: Adding outbound SA
2905 10/20/2002 20:22:42.440 SEV=8 IPSECDBG/1 RPT=1155 
KeyProcessAdd: src 0.0.0.0 mask 255.255.255.255, DST 40.1.1.2 mask 0.0.0.0
2906 10/20/2002 20:22:42.440 SEV=8 IPSECDBG/1 RPT=1156 
KeyProcessAdd: FilterIpsecAddIkeSa success
2907 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/6 RPT=312 
IPSEC key message parse - msgtype 3, Len 376, vers 1, pid 00000000, seq 0, err 0
, type 2, mode 1, state 32, label 0, pad 0, spi 2a2e2dcd, encrKeyLen 24, hashKey
Len 16, ivlen 8, alg 2, hmacAlg 3, lifetype 0, lifetime1 21, lifetime2 0, dsId 0
2910 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/1 RPT=1157 
Processing KEY_UPDATE MSG!
2911 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/1 RPT=1158 
Update inbound SA addresses
2912 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/1 RPT=1159 
key_msghdr2secassoc(): Enter
2913 10/20/2002 20:22:42.440 SEV=7 IPSECDBG/1 RPT=1160 
No USER filter configured
2914 10/20/2002 20:22:42.440 SEV=9 IPSECDBG/1 RPT=1161 
KeyProcessUpdate: Enter
2915 10/20/2002 20:22:42.440 SEV=8 IPSECDBG/1 RPT=1162 
KeyProcessUpdate: success
2916 10/20/2002 20:22:42.440 SEV=8 IKEDBG/7 RPT=64 
IKE got a KEY_ADD MSG for SA: SPI = 0xf1f4d328
2917 10/20/2002 20:22:42.440 SEV=8 IKEDBG/0 RPT=9206 
pitcher: rcv KEY_UPDATE, spi 0x2a2e2dcd
2918 10/20/2002 20:22:42.440 SEV=4 IKE/120 RPT=64 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
PHASE 2 COMPLETED (msgid=cf9d1420)
2919 10/20/2002 20:22:44.680 SEV=7 IPSECDBG/1 RPT=1163 
IPSec Inbound SA has received data!
2920 10/20/2002 20:22:44.680 SEV=8 IKEDBG/0 RPT=9207 
pitcher: recv KEY_SA_ACTIVE spi 0x2a2e2dcd
2921 10/20/2002 20:22:44.680 SEV=8 IKEDBG/0 RPT=9208 
KEY_SA_ACTIVE no old rekey centry found with new spi 0x2a2e2dcd, mess_id 0x0
2922 10/20/2002 20:22:47.530 SEV=9 IPSECDBG/18 RPT=828 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
2923 10/20/2002 20:22:47.530 SEV=9 IPSECDBG/18 RPT=829 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
2924 10/20/2002 20:22:48.280 SEV=9 IPSECDBG/17 RPT=668 
Received an IPSEC-over-NAT-T NAT keepalive packet
2925 10/20/2002 20:22:52.390 SEV=9 IPSECDBG/17 RPT=669 
Received an IPSEC-over-NAT-T NAT keepalive packet
2926 10/20/2002 20:22:52.720 SEV=7 IPSECDBG/1 RPT=1164 
IPSec Inbound SA has received data!
2927 10/20/2002 20:22:52.720 SEV=8 IKEDBG/0 RPT=9209 
pitcher: recv KEY_SA_ACTIVE spi 0x19fb2d12
2928 10/20/2002 20:22:52.720 SEV=8 IKEDBG/0 RPT=9210 
KEY_SA_ACTIVE no old rekey centry found with new spi 0x19fb2d12, mess_id 0x0
2929 10/20/2002 20:22:56.530 SEV=9 IPSECDBG/18 RPT=830 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
2930 10/20/2002 20:22:56.530 SEV=9 IPSECDBG/18 RPT=831 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
2931 10/20/2002 20:22:58.300 SEV=8 IKEDECODE/0 RPT=8192 171.69.89.78 
ISAKMP HEADER : 	( Version 1.0 )
  Initiator Cookie(8): 	B6 92 24 F4 96 0A 2D 9E 
  Responder Cookie(8): 	76 FE F6 55 1F 9D 49 F3 
  Next Payload  :	HASH (8)
  Exchange Type :	Oakley Informational
  Flags         :	1   (ENCRYPT )
  Message ID    : 	d4a0ec25
  Length        : 	76
2938 10/20/2002 20:22:58.300 SEV=8 IKEDBG/0 RPT=9211 171.69.89.78 
RECEIVED Message (msgid=d4a0ec25) with payloads : 
HDR + HASH (8) + NOTIFY (11) + NONE (0)
total length : 76
2940 10/20/2002 20:22:58.300 SEV=9 IKEDBG/0 RPT=9212 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
processing hash
2941 10/20/2002 20:22:58.300 SEV=9 IKEDBG/0 RPT=9213 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Processing Notify payload
2942 10/20/2002 20:22:58.300 SEV=8 IKEDECODE/0 RPT=8193 171.69.89.78 
Notify Payload Decode :
  DOI           :	IPSEC (1)
  Protocol      :	ISAKMP (1)
  Message       :	Altiga keep-alive (40500)
  Spi           :	B6 92 24 F4 96 0A 2D 9E 76 FE F6 55 1F 9D 49 F3 
  Length        :	28
2948 10/20/2002 20:22:58.300 SEV=9 IKEDBG/41 RPT=336 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Received keep-alive of type Altiga keep-alive, not the negotiated type
2950 10/20/2002 20:22:58.310 SEV=8 IKEDECODE/0 RPT=8194 171.69.89.78 
ISAKMP HEADER : 	( Version 1.0 )
  Initiator Cookie(8): 	B6 92 24 F4 96 0A 2D 9E 
  Responder Cookie(8): 	76 FE F6 55 1F 9D 49 F3 
  Next Payload  :	HASH (8)
  Exchange Type :	Oakley Informational
  Flags         :	1   (ENCRYPT )
  Message ID    : 	d196c721
  Length        : 	84
2957 10/20/2002 20:22:58.310 SEV=8 IKEDBG/0 RPT=9214 171.69.89.78 
RECEIVED Message (msgid=d196c721) with payloads : 
HDR + HASH (8) + NOTIFY (11) + NONE (0)
total length : 80
2959 10/20/2002 20:22:58.310 SEV=9 IKEDBG/0 RPT=9215 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
processing hash
2960 10/20/2002 20:22:58.310 SEV=9 IKEDBG/0 RPT=9216 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Processing Notify payload
2961 10/20/2002 20:22:58.310 SEV=8 IKEDECODE/0 RPT=8195 171.69.89.78 
Notify Payload Decode :
  DOI           :	IPSEC (1)
  Protocol      :	ISAKMP (1)
  Message       :	DPD R-U-THERE (36136)
  Spi           :	B6 92 24 F4 96 0A 2D 9E 76 FE F6 55 1F 9D 49 F3 
  Length        :	32
2967 10/20/2002 20:22:58.310 SEV=9 IKEDBG/36 RPT=92 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Sending keep-alive of type DPD R-U-THERE-ACK (seq number 0x2d932552)
2969 10/20/2002 20:22:58.310 SEV=9 IKEDBG/0 RPT=9217 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
constructing blank hash
2970 10/20/2002 20:22:58.310 SEV=9 IKEDBG/0 RPT=9218 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
constructing qm hash
2971 10/20/2002 20:22:58.310 SEV=8 IKEDBG/0 RPT=9219 171.69.89.78 
SENDING Message (msgid=d678099) with payloads : 
HDR + HASH (8) + NOTIFY (11) 
total length : 80
2973 10/20/2002 20:23:02.400 SEV=8 IKEDECODE/0 RPT=8196 171.69.89.78 
ISAKMP HEADER : 	( Version 1.0 )
  Initiator Cookie(8): 	C5 A0 F0 8B 69 60 D7 47 
  Responder Cookie(8): 	48 65 B1 6F 36 1F 9D 3A 
  Next Payload  :	HASH (8)
  Exchange Type :	Oakley Informational
  Flags         :	1   (ENCRYPT )
  Message ID    : 	317b646a
  Length        : 	76
2980 10/20/2002 20:23:02.400 SEV=8 IKEDBG/0 RPT=9220 171.69.89.78 
RECEIVED Message (msgid=317b646a) with payloads : 
HDR + HASH (8) + NOTIFY (11) + NONE (0)
total length : 76
2982 10/20/2002 20:23:02.400 SEV=9 IKEDBG/0 RPT=9221 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
processing hash
2983 10/20/2002 20:23:02.400 SEV=9 IKEDBG/0 RPT=9222 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Processing Notify payload
2984 10/20/2002 20:23:02.400 SEV=8 IKEDECODE/0 RPT=8197 171.69.89.78 
Notify Payload Decode :
  DOI           :	IPSEC (1)
  Protocol      :	ISAKMP (1)
  Message       :	Altiga keep-alive (40500)
  Spi           :	C5 A0 F0 8B 69 60 D7 47 48 65 B1 6F 36 1F 9D 3A 
  Length        :	28
2990 10/20/2002 20:23:02.400 SEV=9 IKEDBG/41 RPT=337 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Received keep-alive of type Altiga keep-alive, not the negotiated type
2992 10/20/2002 20:23:02.410 SEV=9 IPSECDBG/17 RPT=670 
Received an IPSEC-over-NAT-T NAT keepalive packet
2993 10/20/2002 20:23:05.530 SEV=9 IPSECDBG/18 RPT=832 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
2994 10/20/2002 20:23:05.530 SEV=9 IPSECDBG/18 RPT=833 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
2995 10/20/2002 20:23:08.310 SEV=9 IPSECDBG/17 RPT=671 
Received an IPSEC-over-NAT-T NAT keepalive packet
2996 10/20/2002 20:23:12.420 SEV=9 IPSECDBG/17 RPT=672 
Received an IPSEC-over-NAT-T NAT keepalive packet
2997 10/20/2002 20:23:14.530 SEV=9 IPSECDBG/18 RPT=834 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
2998 10/20/2002 20:23:14.530 SEV=9 IPSECDBG/18 RPT=835 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
2999 10/20/2002 20:23:18.330 SEV=8 IKEDECODE/0 RPT=8198 171.69.89.78 
ISAKMP HEADER : 	( Version 1.0 )
  Initiator Cookie(8): 	B6 92 24 F4 96 0A 2D 9E 
  Responder Cookie(8): 	76 FE F6 55 1F 9D 49 F3 
  Next Payload  :	HASH (8)
  Exchange Type :	Oakley Informational
  Flags         :	1   (ENCRYPT )
  Message ID    : 	f6457474
  Length        : 	76
3006 10/20/2002 20:23:18.330 SEV=8 IKEDBG/0 RPT=9223 171.69.89.78 
RECEIVED Message (msgid=f6457474) with payloads : 
HDR + HASH (8) + NOTIFY (11) + NONE (0)
total length : 76
3008 10/20/2002 20:23:18.330 SEV=9 IKEDBG/0 RPT=9224 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
processing hash
3009 10/20/2002 20:23:18.330 SEV=9 IKEDBG/0 RPT=9225 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Processing Notify payload
3010 10/20/2002 20:23:18.330 SEV=8 IKEDECODE/0 RPT=8199 171.69.89.78 
Notify Payload Decode :
  DOI           :	IPSEC (1)
  Protocol      :	ISAKMP (1)
  Message       :	Altiga keep-alive (40500)
  Spi           :	B6 92 24 F4 96 0A 2D 9E 76 FE F6 55 1F 9D 49 F3 
  Length        :	28
3016 10/20/2002 20:23:18.330 SEV=9 IKEDBG/41 RPT=338 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Received keep-alive of type Altiga keep-alive, not the negotiated type
3018 10/20/2002 20:23:18.330 SEV=9 IPSECDBG/17 RPT=673 
Received an IPSEC-over-NAT-T NAT keepalive packet
3019 10/20/2002 20:23:22.430 SEV=8 IKEDECODE/0 RPT=8200 171.69.89.78 
ISAKMP HEADER : 	( Version 1.0 )
  Initiator Cookie(8): 	C5 A0 F0 8B 69 60 D7 47 
  Responder Cookie(8): 	48 65 B1 6F 36 1F 9D 3A 
  Next Payload  :	HASH (8)
  Exchange Type :	Oakley Informational
  Flags         :	1   (ENCRYPT )
  Message ID    : 	358ae39e
  Length        : 	76
3026 10/20/2002 20:23:22.430 SEV=8 IKEDBG/0 RPT=9226 171.69.89.78 
RECEIVED Message (msgid=358ae39e) with payloads : 
HDR + HASH (8) + NOTIFY (11) + NONE (0)
total length : 76
3028 10/20/2002 20:23:22.430 SEV=9 IKEDBG/0 RPT=9227 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
processing hash
3029 10/20/2002 20:23:22.430 SEV=9 IKEDBG/0 RPT=9228 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Processing Notify payload
3030 10/20/2002 20:23:22.430 SEV=8 IKEDECODE/0 RPT=8201 171.69.89.78 
Notify Payload Decode :
  DOI           :	IPSEC (1)
  Protocol      :	ISAKMP (1)
  Message       :	Altiga keep-alive (40500)
  Spi           :	C5 A0 F0 8B 69 60 D7 47 48 65 B1 6F 36 1F 9D 3A 
  Length        :	28
3036 10/20/2002 20:23:22.430 SEV=9 IKEDBG/41 RPT=339 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Received keep-alive of type Altiga keep-alive, not the negotiated type
3038 10/20/2002 20:23:22.430 SEV=9 IPSECDBG/17 RPT=674 
Received an IPSEC-over-NAT-T NAT keepalive packet
3039 10/20/2002 20:23:23.530 SEV=9 IPSECDBG/18 RPT=836 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3040 10/20/2002 20:23:23.530 SEV=9 IPSECDBG/18 RPT=837 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3041 10/20/2002 20:23:28.340 SEV=9 IPSECDBG/17 RPT=675 
Received an IPSEC-over-NAT-T NAT keepalive packet
3042 10/20/2002 20:23:32.440 SEV=9 IPSECDBG/17 RPT=676 
Received an IPSEC-over-NAT-T NAT keepalive packet
3043 10/20/2002 20:23:32.530 SEV=9 IPSECDBG/18 RPT=838 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3044 10/20/2002 20:23:32.530 SEV=9 IPSECDBG/18 RPT=839 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3045 10/20/2002 20:23:38.360 SEV=8 IKEDECODE/0 RPT=8202 171.69.89.78 
ISAKMP HEADER : 	( Version 1.0 )
  Initiator Cookie(8): 	B6 92 24 F4 96 0A 2D 9E 
  Responder Cookie(8): 	76 FE F6 55 1F 9D 49 F3 
  Next Payload  :	HASH (8)
  Exchange Type :	Oakley Informational
  Flags         :	1   (ENCRYPT )
  Message ID    : 	fa8597e6
  Length        : 	76
3052 10/20/2002 20:23:38.360 SEV=8 IKEDBG/0 RPT=9229 171.69.89.78 
RECEIVED Message (msgid=fa8597e6) with payloads : 
HDR + HASH (8) + NOTIFY (11) + NONE (0)
total length : 76
3054 10/20/2002 20:23:38.360 SEV=9 IKEDBG/0 RPT=9230 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
processing hash
3055 10/20/2002 20:23:38.360 SEV=9 IKEDBG/0 RPT=9231 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Processing Notify payload
3056 10/20/2002 20:23:38.360 SEV=8 IKEDECODE/0 RPT=8203 171.69.89.78 
Notify Payload Decode :
  DOI           :	IPSEC (1)
  Protocol      :	ISAKMP (1)
  Message       :	Altiga keep-alive (40500)
  Spi           :	B6 92 24 F4 96 0A 2D 9E 76 FE F6 55 1F 9D 49 F3 
  Length        :	28
3062 10/20/2002 20:23:38.360 SEV=9 IKEDBG/41 RPT=340 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Received keep-alive of type Altiga keep-alive, not the negotiated type
3064 10/20/2002 20:23:38.360 SEV=9 IPSECDBG/17 RPT=677 
Received an IPSEC-over-NAT-T NAT keepalive packet
3065 10/20/2002 20:23:41.530 SEV=9 IPSECDBG/18 RPT=840 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3066 10/20/2002 20:23:41.530 SEV=9 IPSECDBG/18 RPT=841 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3067 10/20/2002 20:23:42.470 SEV=8 IKEDECODE/0 RPT=8204 171.69.89.78 
ISAKMP HEADER : 	( Version 1.0 )
  Initiator Cookie(8): 	C5 A0 F0 8B 69 60 D7 47 
  Responder Cookie(8): 	48 65 B1 6F 36 1F 9D 3A 
  Next Payload  :	HASH (8)
  Exchange Type :	Oakley Informational
  Flags         :	1   (ENCRYPT )
3073 10/20/2002 20:23:42.470 SEV=8 IKEDECODE/0 RPT=8204 171.69.89.78 
  Message ID    : 	c892dd4c
  Length        : 	76
RECEIVED Message (msgid=c892dd4c) with payloads : 
HDR + HASH (8) + NOTIFY (11) + NONE (0)
total length : 76
3076 10/20/2002 20:23:42.470 SEV=9 IKEDBG/0 RPT=9233 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
processing hash
3077 10/20/2002 20:23:42.470 SEV=9 IKEDBG/0 RPT=9234 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Processing Notify payload
3078 10/20/2002 20:23:42.470 SEV=8 IKEDECODE/0 RPT=8205 171.69.89.78 
Notify Payload Decode :
  DOI           :	IPSEC (1)
  Protocol      :	ISAKMP (1)
  Message       :	Altiga keep-alive (40500)
  Spi           :	C5 A0 F0 8B 69 60 D7 47 48 65 B1 6F 36 1F 9D 3A 
  Length        :	28
3084 10/20/2002 20:23:42.470 SEV=9 IKEDBG/41 RPT=341 171.69.89.78 
Group [ciscovpn] User [vpnclient2]
Received keep-alive of type Altiga keep-alive, not the negotiated type
3086 10/20/2002 20:23:42.470 SEV=9 IPSECDBG/17 RPT=678 
Received an IPSEC-over-NAT-T NAT keepalive packet
3087 10/20/2002 20:23:48.370 SEV=9 IPSECDBG/17 RPT=679 
Received an IPSEC-over-NAT-T NAT keepalive packet
3088 10/20/2002 20:23:50.530 SEV=9 IPSECDBG/18 RPT=842 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3089 10/20/2002 20:23:50.530 SEV=9 IPSECDBG/18 RPT=843 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3090 10/20/2002 20:23:52.470 SEV=9 IPSECDBG/17 RPT=680 
Received an IPSEC-over-NAT-T NAT keepalive packet
3091 10/20/2002 20:23:58.380 SEV=8 IKEDECODE/0 RPT=8206 171.69.89.78 
ISAKMP HEADER : 	( Version 1.0 )
  Initiator Cookie(8): 	B6 92 24 F4 96 0A 2D 9E 
  Responder Cookie(8): 	76 FE F6 55 1F 9D 49 F3 
  Next Payload  :	HASH (8)
  Exchange Type :	Oakley Informational
  Flags         :	1   (ENCRYPT )
  Message ID    : 	943c7d99
  Length        : 	76
3098 10/20/2002 20:23:58.390 SEV=8 IKEDBG/0 RPT=9235 171.69.89.78 
RECEIVED Message (msgid=943c7d99) with payloads : 
HDR + HASH (8) + NOTIFY (11) + NONE (0)
total length : 76
3100 10/20/2002 20:23:58.390 SEV=9 IKEDBG/0 RPT=9236 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
processing hash
3101 10/20/2002 20:23:58.390 SEV=9 IKEDBG/0 RPT=9237 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Processing Notify payload
3102 10/20/2002 20:23:58.390 SEV=8 IKEDECODE/0 RPT=8207 171.69.89.78 
Notify Payload Decode :
  DOI           :	IPSEC (1)
  Protocol      :	ISAKMP (1)
  Message       :	Altiga keep-alive (40500)
  Spi           :	B6 92 24 F4 96 0A 2D 9E 76 FE F6 55 1F 9D 49 F3 
  Length        :	28
3108 10/20/2002 20:23:58.390 SEV=9 IKEDBG/41 RPT=342 171.69.89.78 
Group [ciscovpn] User [vpnclient1]
Received keep-alive of type Altiga keep-alive, not the negotiated type
3110 10/20/2002 20:23:58.390 SEV=9 IPSECDBG/17 RPT=681 
Received an IPSEC-over-NAT-T NAT keepalive packet
3111 10/20/2002 20:23:59.530 SEV=9 IPSECDBG/18 RPT=844 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success
3112 10/20/2002 20:23:59.530 SEV=9 IPSECDBG/18 RPT=845 171.69.89.78 
Xmit IPSEC-over-UDP NAT keepalive packet: success

NAT-T encapsulates IPSec traffic in UDP datagrams using port 4500. If NAT-T is not checked on the VPN Concentrator or if NAT transparency is not checked on the VPN Client, the IPSec tunnel is established; however, you are not able to pass any data. For NAT-T to work, you must have the NAT-T checked on the concentrator and NAT transparency (over UDP) checked on the client.

The example below shows such a case in which NAT-T was not checked on the concentrator. On the client, Transparent Tunneling was checked. In this case, an IPSec tunnel is established between the client and the concentrator. However since the IPSec tunnel port negotiations failed, no data passes between the client and the concentrator. As such, the bytes transmitted and received are zero for the remote access sessions.

Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal

The example below shows the statistics of the VPN Client. Notice that the tunnel port negotiated is 0. There is an attempt to ping 192.168.2.251 (private interface of the VPN 3000 Concentrator) and 172.16.172.50 from a DOS prompt. However, these pings are failing because no tunnel port has been negotiated and, thus, the IPSec data is being discarded on the remote VPN server.

Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal

The example below shows that the VPN Client is sending encrypted data (13 packets). But the number of decrypted packets is zero for the remote VPN server, and it has not sent any encrypted data back. Since no tunnel port has been negotiated, the remote VPN server discards the packets and sends no reply data.

Configuring Multiple VPN Clients to a Cisco VPN 3000 Concentrator Using NAT-Traversal