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New Member

Connection drops

System 192.168.100.194 needs to connect to 172.19.1.100 on port 1415.The connections drop and it is intermit.I have provided the log file when connection is unsuccesful.Any idea or help would be appreciated.

1y38w: IP: s=192.168.100.194 (FastEthernet0/0), d=172.19.1.100 (Serial0/0), g=17

2.19.1.100, len 48, forward

1y38w: ICMP: time exceeded (time to live) sent to 172.19.1.100 (dest was 192.168

.100.194)

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: IP: s=192.168.100.194 (FastEthernet0/0), d=172.19.1.100 (Serial0/0), g=17

2.19.1.100, len 48, forward

1y38w: ICMP: time exceeded (time to live) sent to 172.19.1.100 (dest was 192.168

.100.194)

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: ICMP: time exceeded (time to live) sent to 172.19.1.100 (dest was 192.168

.100.194)

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: IP: s=192.168.100.194 (FastEthernet0/0), d=172.19.1.100 (Serial0/0), g=17

2.19.1.100, len 48, forward

1y38w: ICMP: time exceeded (time to live) sent to 172.19.1.100 (dest was 192.168

.100.194)

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: ICMP: time exceeded (time to live) sent to 172.19.1.100 (dest was 192.168

.100.194)

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: IP: s=10.10.1.2 (FastEthernet0/1), d=192.168.0.2 (FastEthernet0/1), g=10.

10.10.5, len 68, forward

4 REPLIES

Re: Connection drops

Those logs also shows that the router is sending back ICMP time exceeded messages to 172.19.1.100 probably as a reply to ICMP echo messages (pings) from 172.19.1.100 to 192.168.100.194. I think 172.19.1.100 host is trying to ping 192.168.100.194 but the router can't get to this host within timeout interval.

I think that the problem is between 192.168.100.194 and the router. Physical (cable/connector) problems are probable. You can check these and also can take sh interface outputs for the router interface servicing 192.168.100.194 (of course first clear counters of the interface) during connection losses.

Regards.

New Member

Re: Connection drops

some more update...I did clear the counters of the interface and there are no sign of any errors.

Meanwhile I have a nat configured as

ip nat outside source static 192.168.100.214 192.168.100.194

192.168.100.214(outside) and 172.19.1.100(inside)

I did a debug ip packet detail (telnet 172.19.1.100 1415)

1y38w: IP: s=192.168.100.194 (FastEthernet0/0), d=172.19.1.100 (Serial0/0), g=

2.19.1.100, len 48, forward

1y38w: TCP src=4489, dst=1415, seq=1768711905, ack=0, win=16384 SYN

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: ICMP type=11, code=0

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: ICMP type=11, code=0

1y38w: IP: s=192.168.100.194 (FastEthernet0/0), d=172.19.1.100 (Serial0/0), g=17

2.19.1.100, len 48, forward

1y38w: TCP src=4489, dst=1415, seq=1768711905, ack=0, win=16384 SYN

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: ICMP type=11, code=0

1y38w: IP: s=192.168.9.38 (local), d=172.19.1.100 (Serial0/0), len 56, sending

1y38w: ICMP type=11, code=0

Re: Connection drops

You say that you experience intermittent connections . Do you mean that sometimes you can't connect or data flow is being interrupted. As long as you don't have a configuration concerning layer-4 on the router (for example extended ACLs) router doesn't differentiate a TCP connection, UDP flow or ICMP packets. So when you initiate a long session of pings between these servers what do you see?

And could you provide full config of the router?

New Member

Re: Connection drops

Iwant to all advance thing in detail.

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