Cisco VPN and Cisco 2651 customer support
I 2651 and remote VPN client
Client can successfully establish VPN to 2651 but nothing through this tunnel. In the stats customers there are no decrypted packets. In 2651 I saw the incoming packets but no response. What evil? (This cisco also make VPN tunnel with each other)
2651 config:
version 12.3
customer password username
AAA new-model
AAA authentication login userauthen local
AAA - the id of the joint session
crypto ISAKMP policy 3
BA 3des
preshared authentication
Group 2
!
crypto ISAKMP policy 10
md5 hash
preshared authentication
ISAKMP crypto key xxxx address xx.xx.xx.xx
ISAKMP crypto nat keepalive 20
!
ISAKMP crypto client configuration group 3000client
xxxxxxxxxxxx key
DNS 192.168.77.1
win 192.168.77.1
area xxx.xx
pool ippool
ACL 111
!
!
Crypto ipsec transform-set esp - esp-md5-hmac M-Chel
!
Crypto-map dynamic dynmap 10
game of transformation-M-Chel
!
!
card crypto client TunnelMap of authentication list userauthen
card crypto isakmp authorization list groupauthor TunnelMap
client configuration address card crypto TunnelMap answer
map TunnelMap 1 ipsec-isakmp crypto
defined peer xx.xx.xx.xx
game of transformation-M-Chel
match address 110
map TunnelMap 10-isakmp ipsec crypto dynamic dynmap
!
!
!
interface FastEthernet0/0
Description link to DMZ
IP address xxx.xxx.xxx.252 255.255.255.224
no ip route cache
no ip mroute-cache
automatic duplex
automatic speed
No cdp enable
no cache route NCLC
NAT outside IP
card crypto TunnelMap
!
interface FastEthernet0/1
Description network internal
IP 192.168.77.17 255.255.255.0
no ip route cache
no ip mroute-cache
automatic duplex
automatic speed
No cdp enable
NAT outside IP
no cache route NCLC
!
local pool IP 192.168.10.1 ippool 192.168.10.50
IP nat inside source list 1 interface FastEthernet0/0 overload
IP route 0.0.0.0 0.0.0.0 xxx.xxx.xxx.xxx permanent
!
access-list 110 permit ip 192.168.77.0 0.0.0.255 host xx.xx.xx.xx
access-list 111 allow ip 192.168.77.0 0.0.0.255 192.168.10.0 0.0.0.255
Two things:
You have not defined a group of authorization specifying that authorization for VPN clients will be done locally. Add the following:
AAA authorization groupauthor LAN
And your NAT statement is probably wrong, even if you have not shown that the ACL 1 is equal to. follow these steps:
IP nat inside source list 100 int fa0/0 overload
access-list 100 deny ip 192.168.77.0 0.0.0.255 host xx.xx.xx.xx
access-list 100 deny ip 192.168.77.0 0.0.0.255 192.168.10.0 0.0.0.255
access-list 100 permit ip 192.168.77.0 0.0.0.255 any
no nat ip within the source list 1 int Fa0/0 overload
Note that if you get an error after this last order saying NAT entries are in use, leave the config mode, do:
clear the ip nat trans *.
return to mode config, and then retype the command. You must make sure that when you do a 'wr t', there is only a single command 'ip nat inside source... ". "in the config and it is the one that refers to ACL 100.
Tags: Cisco Security
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