On May 5, 2011, at 11:28 AM, Darren Reed wrote:

> I see - you're concerned about how do you make "tcpdump icmp" work when the 
> link type is PPI (or pcap-ng)

Presumably meaning "when the link type is PPI or when the file is a pcap-ng 
file" (pcap-ng isn't a link type, it's a file format).

> and the contents of the file could be a mixture of ethernet, Infiniband and 
> others. The problem being that the location of the IP header is different in 
> each, requiring a different program to be generated and applied.

The location of the IP header *and* the location and values of the type field 
in the link-layer header are different.-
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