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Problem connecting to remote VPN server when sat behind Cisco 1841 router

Posted on 2007-03-20
Last Modified: 2008-03-03
Hi All,

This is the situation, The owner of our company is sat behind a Cisco 1841 router (firewall turned off), he is trying to initiate a VPN connection to a server outside of our company.

In the way is our company firewall.

I have opened a rule in the firewall to allow access through to a certain address (the vpn server of the other company). I can see traffic passing through our firewall after meeting this rule.

However, he is getting a "verifying username and password" message and then it times out.

I have narrowed it down to the router, has anyone else had this problem?

Here is an example of the router's config :

version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname OFFICE
logging queue-limit 100
no logging buffered
enable secret 5 $1$SJ30$08lBzf7AVKDQswtBpmmLZ1
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
no ip cef
ip dhcp excluded-address 172.16.XXX.129 172.16.XXX.140
ip dhcp excluded-address 172.16.XXX.1 172.16.XXX.16
ip dhcp pool CLIENT
   import all
   network 172.16.XXX.128
   default-router 172.16.XXX.129
ip dhcp pool STAFF
   import all
   network 172.16.XXX.0
   default-router 172.16.XXX.1
   lease 2
no ip domain lookup
no ftp-server write-enable
interface FastEthernet0/0
 description Connection to the STAFF ethernet segment
 ip address 172.16.XXX.1
 ip access-group 10 out
 hold-queue 100 out

interface ATM0/0/0
 no ip address
 no atm ilmi-keepalive
 pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 dsl operating-mode auto
interface FastEthernet0/1
 description Connection to the CLIENT ethernet segment
 ip address 172.16.XXX.129
 ip access-group 10 out
 hold-queue 100 out

interface Dialer1
 ip address negotiated
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp authentication chap pap callin
 ppp chap hostname OFFICE@A4EADSL.CO.UK
 ppp chap password 0 PASSPHRASE
 ppp pap sent-username OFFICE@A4EADSL.CO.UK password 0 PASSPHRASE
 ppp ipcp dns request
 ppp ipcp wins request
 hold-queue 224 in
ip classless
ip route Dialer1
ip http server
no ip http secure-server
access-list 10 permit 172.16.XXX.16
access-list 10 permit 172.16.XXX.0
access-list 10 deny   172.16.XXX.0
access-list 10 permit any
dialer-list 1 protocol ip permit
line con 0
 exec-timeout 120 0
 password 7 104D000A0618
 stopbits 1
line aux 0
 stopbits 1
line vty 0 4
 exec-timeout 120 0
 password 7 14141B180F0B
 length 0
scheduler max-task-time 5000
Question by:A4eIT
  • 2
LVL 10

Accepted Solution

Sorenson earned 500 total points
ID: 18759079
What vpn client is he using?  If it is a cisco vpn client, be sure that the vpn server (firewall, router, pix, asa) has nat traversal enabled (http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ftipsnat.htm) .  If it is a microsoft, or PPTP vpn, he will need a static translation through the firewall (not a hide or global) and the firewall will need to allow pptp ports back to that address.

Author Comment

ID: 18762503
Hi sorry it's a bog standard windows VPN connection

Author Comment

ID: 18904199
Turned out to be a NAT problem. thanks for the help anyway.

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