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TCP CONNECTIONS DROPPED

Hi All,

I have a cisco 3745 router on a network I manage. of late I have had with one of the links I manage. the issue is that when a tcp connection is being established from an external network to my internal network, the traffic does not go past the router. on closer inspection of the traffic, I notice that I am getting SYN packets from the host in the external network but it seems like they all get dropped by the router because there is no trace of the same packets beyond the router to my internal network. I have searched for what the reason for this kind of behavior could be but I have not found anything. Has anyone experienced this before and how do I remedy this?

Thanks in advance.

1 Reply 1

Michel Hegeraat
Level 7
Level 7

When a router does not know the destination network it drops the packet.

Do a sh route for the "external network" on the router.

Cheers,

Michel