RE: [SQU] More on WCCP and truncated GRE packets. --HELP

Isn't there a way to just set the MTU on the Cisco router to at least (size
of clientMTU) + 24? This would be easier than trying to implement a
company-wide policy MTU....

>actually, that highlights part of the issue.
>
>in the case of a 'large packet' where adding a GRE header + new IP header
>causes the frame size to exceed the MTU, the router will have to fragment
>the packet.
>that then means that the GRE-tunnel-termination point (the ip_wccp module
>in linux) would need to be capable of handling reassembly of tcp fragments
>when the fragments are received inside a GRE tunnel.
>
>i am not familiar with the ip_wccp code to know if this is the case or
>not. given the failure condition, i'm guessing that it isn't.
>
>if this is the case, the workaround stated above (squid enforce the
>client-side MSS to something such that fragmentation cannot occur) will
>cause the problem to go away.
>
>
>cheers,
>
>lincoln.

Nathan Lewis

Senior Network Administrator
nathan_lewis@uclid.com

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