Encapsulation by default is ARPA. Can this be changed? JB J B wrote: > > I wonder about the encapsulation type for the interface? > > JB > > > Xy Hien Le wrote: > > > > I have an issue that took me almost a month and still not > > figure out what's > > the problem? > > > > I can ping out to a connected router (fastethernet or any type > > of interfaces) > > and can only ping the local interface. > > For example, if I connect this router FastEthernet F3/0 to > > another router > > FastEthernet 4/0. both routers' fastethernets shown UP/UP > > status but none can > > ping each other. this particular router only can ping itself > > and refuse to > > ping any other... > > Here is the configurations and pinging with "debug ip packet > > detail": > > > > Router#sh run > > Building configuration... > > > > Current configuration: > > ! > > version 12.0 > > service timestamps debug uptime > > service timestamps log uptime > > no service password-encryption > > ! > > hostname Router > > ! > > ! > > ! > > ! > > ! > > ! > > ip subnet-zero > > no ip domain-lookup > > ! > > ! > > ! > > ! > > ! > > ! > > ! > > ! > > interface FastEthernet0/0 > > no ip address > > no ip directed-broadcast > > shutdown > > media-type MII > > half-duplex > > ! > > interface TokenRing1/0 > > ip address 150.50.18.100 255.255.255.0 > > no ip directed-broadcast > > shutdown > > ring-speed 16 > > ! > > interface TokenRing1/1 > > no ip address > > no ip directed-broadcast > > shutdown > > ring-speed 16 > > ! > > interface TokenRing1/2 > > no ip address > > no ip directed-broadcast > > shutdown > > ring-speed 16 > > ! > > interface TokenRing1/3 > > no ip address > > no ip directed-broadcast > > shutdown > > ring-speed 16 > > ! > > interface ATM2/0 > > no ip address > > no ip directed-broadcast > > shutdown > > no atm ilmi-keepalive > > ! > > interface FastEthernet3/0 > > ip address 1.1.1.2 255.255.255.0 > > no ip directed-broadcast > > half-duplex > > ! > > ip classless > > no ip http server > > ! > > ! > > line con 0 > > transport input none > > line aux 0 > > line vty 0 4 > > login > > ! > > end > > > > Router#sh ip int f3/0 > > FastEthernet3/0 is up, line protocol is up > > Internet address is 1.1.1.2/24 > > Broadcast address is 255.255.255.255 > > Address determined by setup command > > MTU is 1500 bytes > > Helper address is not set > > Directed broadcast forwarding is disabled > > Outgoing access list is not set > > Inbound access list is not set > > Proxy ARP is enabled > > Security level is default > > Split horizon is enabled > > ICMP redirects are always sent > > ICMP unreachables are always sent > > ICMP mask replies are never sent > > IP fast switching is enabled > > IP fast switching on the same interface is disabled > > IP Flow switching is disabled > > IP Fast switching turbo vector > > IP Null turbo vector > > IP multicast fast switching is enabled > > IP multicast distributed fast switching is disabled > > IP route-cache flags are Fast > > Router Discovery is disabled > > IP output packet accounting is disabled > > IP access violation accounting is disabled > > TCP/IP header compression is disabled > > RTP/IP header compression is disabled > > Probe proxy name replies are disabled > > Policy routing is disabled > > Network address translation is disabled > > WCCP Redirect outbound is disabled > > WCCP Redirect exclude is disabled > > BGP Policy Mapping is disabled > > Router#ping 1.1.1.1 > > > > Type escape sequence to abort. > > Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 > seconds: > > > > 00:28:06: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > sending > > 00:28:06: ICMP type=8, code=0 > > 00:28:06: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > encapsula > > tion failed > > 00:28:06: ICMP type=8, code=0. > > 00:28:08: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > sending > > 00:28:08: ICMP type=8, code=0 > > 00:28:08: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > encapsula > > tion failed > > 00:28:08: ICMP type=8, code=0. > > 00:28:10: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > sending > > 00:28:10: ICMP type=8, code=0 > > 00:28:10: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > encapsula > > tion failed > > 00:28:10: ICMP type=8, code=0. > > 00:28:12: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > sending > > 00:28:12: ICMP type=8, code=0 > > 00:28:12: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > encapsula > > tion failed > > 00:28:12: ICMP type=8, code=0. > > 00:28:14: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > sending > > 00:28:14: ICMP type=8, code=0 > > 00:28:14: IP: s=1.1.1.2 (local), d=1.1.1.1 (FastEthernet3/0), > > len 100, > > encapsula > > tion failed > > 00:28:14: ICMP type=8, code=0. > > Success rate is 0 percent (0/5) > > Router# > > > > Router#ping 1.1.1.2 > > > > Type escape sequence to abort. > > Sending 5, 100-byte ICMP Echos to 1.1.1.2, timeout is 2 > seconds: > > !!!!! > > Success rate is 100 percent (5/5), round-trip min/avg/max = > > 1/2/4 ms > > Router# > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=8, code=0 > > 00:28:34: IP: s=1.1.1.2 (local), d=1.1.1.2 (FastEthernet3/0), > > len 100, > > sending > > 00:28:34: ICMP type=0, code=0 > > 00:28:34: IP: s=1.1.1.2 (FastEthernet3/0), d=1.1.1.2 > > (FastEthernet3/0), len > > 100, > > rcvd 3 > > 00:28:34: ICMP type=0, code=0 > > > > As you can see, it can only ping itself and not the other > > router! > > > > The configuration of the other router is exactly the same with > > ip add 1.1.1.1 > > 255.255.255.0 > > > > Thanks for everyone help to resolve this problem. > > > > Xy > > > > > >
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