Debug Ip packet - unroutable

From: David Oakman (doakman@xxxxxxxx)
Date: Tue Aug 17 1999 - 22:16:58 GMT-3


   
All,

I went to spend some time hammering away at dlsw, but found myself engulfed in
a troubleshooting excersise. (maybee good practice for afternoon on sept 2 if I
 make it that far).

        I am pulling my hair out over this one. My term server (172.16.2.225) i
s connected via ethernet to my backbone. The default route is 172.16.2.254 and
has been working fine. I am able to ping/telnet to the box from the default gat
way. No secondary addresses/accesslist/policys are being used.

Unroutable tells me that there are no routes to the destination and no default
route.It appears that the packet is dieing in the routing process of the router
 and never making it to the ethernet interface.

Trace never makes it to first hop (which is in fact the destination router, but
 different interface).

 If I add a static route 172.16.1.254 255.255.255.255 172.16.2.254 it works, bu
t my default route is still not working.

Router has been rebooted

All other routing appears to be working fine.

Any thoughts ??????

Thanks in advance
ttfn
DaveO
2 weeks and counting

r2(termserv)#ping 172.16.1.254

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.254, timeout is 2 seconds:
.
00:35:54: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:35:54: ICMP type=8, code=0
00:35:56: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:35:56: ICMP type=8, code=0.
00:35:58: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:35:58: ICMP type=8, code=0..
00:36:00: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:36:00: ICMP type=8, code=0
00:36:02: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:36:02: ICMP type=8, code=0.
Success rate is 0 percent (0/5)

Gateway of last resort is 172.16.2.254 to network 0.0.0.0
     1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback1
     172.168.0.0/24 is subnetted, 1 subnets
C 172.168.32.0 is directly connected, Loopback0
     173.168.0.0/24 is subnetted, 1 subnets
D EX 173.168.40.0 [170/40537600] via 10.20.1.2, 00:01:48, Serial0
     10.0.0.0/16 is subnetted, 5 subnets
D 10.10.0.0 [90/41024000] via 10.20.1.2, 00:01:48, Serial0
D EX 10.3.0.0 [170/40537600] via 10.20.1.2, 00:01:48, Serial0
D 10.1.0.0 [90/40537600] via 10.20.1.2, 00:01:48, Serial0
C 10.20.0.0 is directly connected, Serial0
D EX 10.33.0.0 [170/40537600] via 10.20.1.2, 00:01:48, Serial0
     11.0.0.0/16 is subnetted, 1 subnets
D EX 11.1.0.0 [170/40537600] via 10.20.1.2, 00:01:48, Serial0
B 12.0.0.0/8 [200/0] via 11.1.1.6, 00:02:09
B 40.0.0.0/8 [200/0] via 10.20.1.2, 00:02:09
B 41.0.0.0/8 [200/0] via 10.20.1.2, 00:02:09
     44.0.0.0/24 is subnetted, 1 subnets
B 44.1.1.0 [200/0] via 10.20.1.2, 00:02:09
B 192.168.1.0/24 [200/0] via 10.20.1.2, 00:02:09
B 177.1.0.0/16 [200/0] via 11.1.1.6, 00:02:09
     172.16.0.0/24 is subnetted, 1 subnets
C 172.16.2.0 is directly connected, Ethernet0
     200.200.200.0/32 is subnetted, 1 subnets
S 200.200.200.1 [1/0] via 10.20.1.2
S* 0.0.0.0/0 [1/0] via 172.16.2.254

r2(termserv)#ping 172.16.1.254

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.254, timeout is 2 seconds:
.
00:35:54: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:35:54: ICMP type=8, code=0
00:35:56: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:35:56: ICMP type=8, code=0.
00:35:58: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:35:58: ICMP type=8, code=0..
00:36:00: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:36:00: ICMP type=8, code=0
00:36:02: IP: s=172.16.2.225 (local), d=172.16.1.254, len 100, unroutable
00:36:02: ICMP type=8, code=0.
Success rate is 0 percent (0/5)

r2(termserv)#sho arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.16.2.254 0 0060.837b.afc9 ARPA Ethernet0
Internet 172.16.2.225 - 0000.0c47.19c3 ARPA Ethernet0

Ethernet0 is up, line protocol is up
  Hardware is Lance, address is 0000.0c47.19c3 (bia 0000.0c47.19c3)
  Internet address is 172.16.2.225/24
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:24:42
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 1/75, 0 drops
  5 minute input rate 2000 bits/sec, 3 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     6622 packets input, 551575 bytes, 0 no buffer
     Received 5635 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 input packets with dribble condition detected
     1710 packets output, 147213 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 1 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

Ethernet0 is up, line protocol is up
  Internet address is 172.16.2.225/24
  Broadcast address is 255.255.255.255
  Address determined by non-volatile memory
  MTU is 1500 bytes
  Helper address is not set
  Directed broadcast forwarding is enabled
  Multicast reserved groups joined: 224.0.0.10
  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 multicast fast switching is enabled
  Router Discovery is disabled
  IP output packet accounting is disabled
  IP access violation accounting is disabled
  TCP/IP header compression is disabled
  Probe proxy name replies are disabled
  Gateway Discovery is disabled
  Policy routing is disabled
  Network address translation is disabled



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