I'm sorry for the silly issue, but I have a very basic knowledge of Cisco and today I've lost many hours without seeing the light. The configuration is very simple: I have a couple of 803 linked via ISDN line named Rome and Naples. In Rome my subnet is 167.228.167.xxx, in Naples is 192.168.0.xxx Unfortunately I cant call the subnet 192.168.0.xxx from Rome because it's already used in the WAN I'm connected.
So I have to use a static NAT to translate the only address I'm interested
192.168.0.134 in 192.168.15.134On the NAPLES router I've configured the BRI0 isdn port as inside and the ethernet (where is connected the remote host) as outside. When I ping 192.168.15.134 from naples the IP is correctly converted in
192.168.0.134 and everything goes fine.00:03:06: IP: tableid=0, s=192.168.0.133 (local), d=192.168.15.134 (Ethernet0), routed via RIB
00:03:06: IP: s=192.168.0.133 (local), d=192.168.15.134 (Ethernet0), len 100, sending 00:03:06: NAT: s=192.168.0.133, d=192.168.15.134->192.168.0.134 [11] 00:03:06: IP: tableid=0, s=192.168.0.134 (Ethernet0), d=192.168.0.133 (Ethernet0), routed via RIB 00:03:06: IP: s=192.168.0.134 (Ethernet0), d=192.168.0.133 (Ethernet0), len 100, rcvd 3When I ping from rome, the router dials and connects to naples, but ping fails. Debugging on Naples I see all this encapsulation errors and no NAT translation!!!
00:04:22: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to 061234567 ROME 00:04:23: IP: tableid=0, s=167.228.167.113 (Dialer1), d=192.168.15.133 (Ethernet0), routed via RIB 00:04:23: IP: s=167.228.167.113 (Dialer1), d=192.168.15.133 (Ethernet0), g=192.168.15.133, len 100, forward 00:04:23: IP: s=167.228.167.113 (Dialer1), d=192.168.15.133 (Ethernet0), len 100, encapsulation failedWhat can it be? I know its a missing route but I can't find it !!! As you can see from the router the configuration is quite simple... Could you be so kind to point me in the right direction?
Many thanks Giuseppe
version 12.3 ! hostname NAPLES ! boot-start-marker boot-end-marker ! username ROME password 7 asdasdasdas ! no aaa new-model ip subnet-zero no ip domain lookup ! isdn switch-type basic-net3 ! interface Ethernet0 description connected to EthernetLAN_1 ip address 192.168.0.133 255.255.255.0 ip nat outside no keepalive ! interface BRI0 description connected to ROME no ip address ip nat inside encapsulation ppp dialer rotary-group 1 dialer-group 1 isdn switch-type basic-net3 no cdp enable ! interface Dialer1 description connected to ROME ip unnumbered Ethernet0 encapsulation ppp no ip split-horizon dialer in-band dialer map ip 167.228.167.113 name ROME broadcast 01234567 dialer hold-queue 10 dialer-group 1 no cdp enable ppp authentication chap ! ip nat outside source static 192.168.0.134 192.168.15.134 ip route 192.168.15.0 255.255.255.0 Ethernet0 ip classless no ip http server ! dialer-list 1 protocol ip permit snmp-server engineID local 00000009020001308003F817 snmp-server community public RO