I'd check the isdn stuf, deb dialer, deb isdn q931, etc... ""DW"" a icrit dans le message de news: [EMAIL PROTECTED] > When the primary is up the route table shows: > > 192.1.1.0/24 is variably subnetted, 2 subnets, 2 masks > S 192.1.1.0/24 is directly connected, Serial0/0:1 > C 192.1.1.25/32 is directly connected, Serial0/0:1 > > When the primary goes down it shows: > > 192.1.1.0/24 is variably subnetted, 2 subnets, 2 masks > S 192.1.1.0/24 is directly connected, BRI1/1 > C 192.1.1.25/32 is directly connected, BRI1/1 > > This is why I don't understand why it will not work !! > > Thanks, > > Derek > > > > wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > What does your route table show on both routers? > > > > Mark > > > > > I have a 3640 router (Pri rate Interface / backup ISDN interfaces) that > is > > > not performing as I thought it would...One of the channelised interfaces > > > went down yesterday and the backup ISDN for that line kicked in, however > I > > > could no longer ping into the remote site once the backup came up - The > > > remote router is a 1720. > > > I could ping from router to router (In both directions). > > > I could not ping from a client in Site A to router in Site B, or beyond. > > > I could not ping from a client in Site B to router in Site A, or beyond. > > > > > > Below is part of the config: > > > > > > SITE A - 3640 > > > > > > interface FastEthernet0/0 > > > ip address 192.168.25.25 255.255.255.0 > > > > > > duplex auto > > > > > > speed 100 > > > > > > no cdp enable > > > > > > > > > interface Serial0/0:1 > > > > > > bandwidth 128 > > > > > > backup delay 20 20 > > > > > > backup interface BRI1/1 > > > > > > ip unnumbered FastEthernet0/0 > > > > > > no ip directed-broadcast > > > > > > encapsulation ppp > > > > > > fair-queue 64 256 0 > > > > > > no cdp enable > > > > > > > > > > > > interface BRI1/1 > > > > > > ip unnumbered FastEthernet0/0 > > > > > > no ip directed-broadcast > > > > > > encapsulation ppp > > > > > > dialer idle-timeout 300 > > > > > > dialer string XXXXXXXX > > > > > > dialer hold-queue 20 > > > > > > dialer-group 1 > > > > > > isdn switch-type basic-net3 > > > > > > no cdp enable > > > > > > ppp authentication chap > > > > > > > > > > > > ip route 192.1.1.0 255.255.255.0 Serial0/0:1 > > > > > > ip route 192.1.1.0 255.255.255.0 BRI1/1 50 > > > > > > > > > > > > access-list 100 permit ip any any > > > > > > access-list 100 permit icmp any any > > > > > > dialer-list 1 protocol ip list 100 > > > > > > > > > > > > SITE B - 1720 > > > > > > > > > > > > interface BRI0 > > > ip unnumbered FastEthernet0 > > > encapsulation ppp > > > dialer idle-timeout 300 > > > dialer string XXXXXXX > > > > > > dialer hold-queue 50 > > > dialer-group 1 > > > isdn switch-type basic-net3 > > > ppp authentication chap > > > ! > > > interface FastEthernet0 > > > ip address 192.1.1.25 255.255.255.0 > > > speed auto > > > ! > > > interface Serial0 > > > bandwidth 128 > > > backup delay 20 20 > > > backup interface BRI0 > > > ip unnumbered FastEthernet0 > > > ! > > > ip classless > > > ip route 192.168.25.0 255.255.255.0 Serial0 > > > ip route 192.168.25.0 255.255.255.0 BRI0 50 > > > no ip http server > > > ! > > > access-list 100 permit ip any any > > > access-list 100 permit icmp any any > > > dialer-list 1 protocol ip list 100 > > > > > > > > > > > > Can anyone out there see anything obviously wrong with the above > config.... > > > > > > > > > > > > Thanks in advance. > > > > > > > > > > > > Derek
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