Capturing bad packets

otheus · #1 (**permalink**) 10-14-2009

Hello,

SNMP reports from my Linux server a large number of "ipInAddrErrors" on several of my systems. According to one description, these packets are discarded datagrams due to:

Quote:

the IP address in their IP header's destination field was not a valid address to be received at this entity. ... For entities which are not IP Gateways and therefore do not forward datagrams, this counter includes datagrams discarded because the destination address was not a local address.

How do I determine what packets these are? Can tcpdump help? If so, can anyone suggest a filter?

Neo · #2 (**permalink**) 10-15-2009

It might be more efficient to alter the SNMP code to include the fields you want from the IP header in the SNMP info (is this an SNMP trap?)

That is what I would do since you more-than-likely have access to the Linux source code.

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