Can anyone help with some ISDN advice.
I have a router with a remote ISDN connection. The router is able to successfully dial and authenticate to the remote ISDN device. When a ping is sent from an inside server to the remote end it fails.
Originally the ISDN solution was on an old 2600 with a PRI and this worked fine. I lifted the config off the 2600 and modified it slightly to drop onto a new 1841 router with a BRI and pings won't work. Put it back on the PRI router and it does.
A traceroute from an inside machine 10.20.0.10 (see NAT statement below) hits 10.20.100.2 and then stops. The ISDN authenticates fine but no ping responses even though I am seeing hits on my 'interesting traffic' ACL. I assume the router is just dropping the packets even though the ISDN authenticates. After the idle timeout period the ISDN closes.
Config as follows:
interface FastEthernet0/1 description Connection to LAN Switch ip address 10.20.100.2 255.255.0.0 ip address 212.X.X.113 255.255.255.252 secondary no ip redirects ip nat inside ip virtual-reassembly speed 100 full-duplex ! interface BRI0/1/0 description Test ISDN Link no ip address encapsulation ppp dialer pool-member 1 isdn switch-type basic-net3 no fair-queue no cdp enable ppp authentication chap ppp multilink ! interface Dialer10 description Test ISDN Dialer ip address 195.X.X.37 255.255.255.0 ip nat outside ip virtual-reassembly encapsulation ppp dialer pool 1 dialer remote-name blah dialer idle-timeout 30 dialer string 0012345678 dialer-group 2 no cdp enable ppp authentication chap ppp multilink
ip nat inside source static 10.20.0.10 212.X.X.114
ip route 147.X.X.X 255.255.255.0 195.X.X.X name ISDN Test
dialer-list 2 protocol ip list 102
access-list 102 permit icmp host 212.X.X.113 host 147.X.X.X access-list 102 permit tcp host 212.X.X.X host 147.X.X.X log access-list 102 permit icmp host 212.X.X.114 host 147.X.X.X log access-list 102 permit tcp host 212.X.X.114 host 147.X.X.X log