[svlug] TCP checksum ignored?
lists-svlug at ira.abramov.org
Sun Mar 23 08:12:44 PST 2003
for the second time in 4 months I bump into a blade in one of our blade
servers that ignores TCP packet errors quitely.
Scenario: files pulled over TCP (http, ftp) to the machine (mobile
Pentium 3, Intel e1000 interface) get there with a different md5sum each
time. tried both with machines on the same subnet as well as remote. the
second interface on that same blade works fine. I have no other
conclusion to reach but that the faulty interface not only changes the
occasional bit in the data, but both ethernet and TCP error detection
Is there a possibility that in order to cut CPU overhead, the kernel
defaults not to check crc32 on TCP packets? I saw this with three
different kernel versions as well, from SuSE, RH and virgin 2.4.20 from
any ideas, anyone?
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