I have set up a simple ISDN dial up between two routers, and I don't see any wrong with the configs may be. The funny thing is when I use dialer string command on both routers then I can successfully ping each other, but if I replace Dialer String with Dialer Map which is a preferred way I am not able to ping. The Bri channel 1 will be connected, but my ping times out. Here is the configs for both routers:r1#wr tBuilding configuration...Current configuration:!version 11.3service timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname r1!enable secret 5 $1$oix0$jjbU/t1qjJlHT1zYajIeG/!no ip domain-lookupisdn switch-type basic-ni1!!interface Ethernet0 ip address 170.10.22.1 255.255.255.0 no keepalive media-type 10BaseT!interface Ethernet1 no ip address shutdown media-type 10BaseT!interface Serial0 no ip address encapsulation frame-relay!interface Serial0.1 point-to-point ip address 170.10.29.1 255.255.255.252 frame-relay interface-dlci 102!interface Serial1 ip address 170.10.23.1 255.255.255.252!interface Serial2 no ip address shutdown!interface Serial3 no ip address shutdown!interface BRI0 ip address 170.10.129.1 255.255.255.252 encapsulation ppp dialer map ip 170.10.129.2 name r2 broadcast 9636000 dialer-group 1 isdn spid1 25696350000101 isdn spid2 25696350010101!interface BRI1 no ip address shutdown!interface BRI2 no ip address shutdown!interface BRI3 no ip address shutdown!router ospf 1 passive-interface BRI0 network 170.10.22.1 0.0.0.0 area 1 network 170.10.23.1 0.0.0.0 area 1 network 170.10.29.1 0.0.0.0 area 0 network 170.10.129.1 0.0.0.0 area 0!ip classless!dialer-list 1 protocol ip permit!line con 0 logging synchronousline aux 0line vty 0 4 no login!endr1#r2#wr tBuilding configuration...Current configuration:!version 11.3service timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname r2!enable secret 5 $1$D58d$cmNsq25bGd02XGPfZSUY9/!no ip domain-lookupisdn switch-type basic-ni1!!interface Ethernet0 no ip address shutdown media-type 10BaseT!interface Ethernet1 no ip address shutdown media-type 10BaseT!interface Serial0 no ip address encapsulation frame-relay no ip mroute-cache!interface Serial0.1 point-to-point ip address 170.10.29.2 255.255.255.252 frame-relay interface-dlci 201!interface Serial1 ip address 170.10.49.2 255.255.255.252!interface Serial2 no ip address shutdown!interface Serial3 no ip address shutdown!interface BRI0 ip address 170.10.129.2 255.255.255.252 encapsulation ppp dialer map ip 170.10.129.1 name r1 broadcast 9635000 dialer-group 1 isdn spid1 25696360000101 isdn spid2 25696360010101!interface BRI1 no ip address shutdown!interface BRI2 no ip address shutdown!interface BRI3 no ip address shutdown!router ospf 1 passive-interface BRI0 network 170.10.0.0 0.0.255.255 area 0!ip classless!dialer-list 1 protocol ip permit!line con 0 logging synchronousline aux 0line vty 0 4 no login!endr2#
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