we have a cisco 800 series router between the internal network and the WAN. the problem is we are unable to receive some of our mail due to dropped packets by our router.
the conversation between the two servers stops at the point were our server responds with the command 250 2.1.5 email@example.com | 354 Start mail input; end with . i was able to trace the packet, using Packet Export, on the internal interface but not on the external interface. Also i have noticed that the external interface has about 160,000 unknown protocol drops while the internal interface has 0.
Is there anyway to find out way the external interface is dropping the packets.
i am not the one who configured the router we had an outside consultant do it for us as cisco is not my strong suite. he has been working on this problem for the past month but we are still experiencing the problem.he says he has configured it to the minimum configurations, i.e. no firewall, and no access lists.
it uses the secondary i think. i have re-attached the configuration file.
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