Jeffrey Hutzelman wrote:
On Friday, February 04, 2005 01:58:06 PM -0500 Joe Buehler <[EMAIL PROTECTED]> wrote:
A further point of information. Using tcpdump on the main two fileservers I see a lot of udp checksum errors. One of the machines has fragment reassembly timeouts, which probably explains the AFS delays.
I am a bit puzzled by tcpdump claiming errors in the UDP checksum for *outgoing* packets on one of the machines, however. At what point does tcpdump hook into the ethernet hardware? Seems like UDP checksums in outgoing packets should be impossible...
I've noticed that too in some cases, and not just with AFS.
It seems that in at least some situations, tcpdump does not get to see the real UDP checksum that will appear on the wire for outgoing traffic. This is entirely dependent on how the operating system implements its packet tracing facility.
Does your ethernet card have hardware checksumming? Maybe tcpdump is getting the packets before the hardware has put in the checksums...
_______________________________________________
OpenAFS-info mailing list
[email protected]
https://lists.openafs.org/mailman/listinfo/openafs-info
