Cisco VPN :: Site To Site VPN 2921 Failure And Fail To Allocate

May 2, 2012

I'm trying to configure a VPN between a Check Point firewall (UTM-1, running R75.10) and a 2921 router (15.0(1r)M9).Here's the relevant config (names and external IP addresses only modified - using 1.1.1.1 for Check Point and 2.2.2.2 for Cisco):

================================================
## vpn phase 2 access list (also used for route map)access-list 2699 permit ip 192.168.209.16 0.0.0.15 192.168.51.128 0.0.0.127
 
## nat route maproute-map R1 permit 2699match ip address 2699
 
## phase 1 detailscrypto isakmp policy 10encr aes 256authentication pre-sharegroup 2lifetime 86400
 
## pskcrypto isakmp key ............... address 1.1.1.1 no-xauth
 
## phase 2 transform setcrypto ipsec transform-set AES-256 esp-aes 256 esp-sha-hmac
 
## phase 2 detailscrypto map VPN 2699 ipsec-isakmp set peer 1.1.1.1set pfs group2set transform-set AES-256set security-association lifetime seconds 3600match address 2699
 
## nat definitionsip nat inside source static 10.231.70.250 192.168.209.17 route-map R1 reversibleip nat inside source static 10.231.10.1 192.168.209.18 route-map R1 reversibleip nat inside source static 10.231.10.10 192.168.209.19 route-map R1 reversible
================================================
 
Phase 1 appears to complete without issue, however at phase two it fails with "Fail to allocate ip address" (full debug attached). Everything I've read suggests that this issue relates to client based VPN, where the Cisco router cannot assign other related attributes to the requesting client (DNS server etc.) but obviously that isn't relevant in this case. Why the router might think it's a client connection and how to stop it?
 
While I'm troubleshooting this issue currently with a Check Point VPN we've noticed the issue appear on other VPNs (to Cisco 880 routers), and the problem seems to solve itself (which obviously doesn't useful in finding the cause of the problem!).

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Building configuration... 
Current configuration : 5425 bytes
!
! Last configuration change at 15:09:21 PCTime Fri Jun 15 2012 by admin01
!
version 12.4
no service pad

[code]....

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!
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object network DOMAIN_LOCAL

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!
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