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List:       freebsd-hackers
Subject:    TCP stack errors
From:       Jose Hidalgo Herrera <jose () hostarica ! com>
Date:       2005-01-31 16:30:05
Message-ID: 1107189005.88247.23.camel () jose ! hostarica ! net
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I have a 4.10p5
	(cvsuped with RELENG_4_10 last friday)
that shows things like this with a netstat -sf inet:

tcp:
                3630 discarded for bad checksums
                85 discarded for bad header offset fields
        1220093 bad connection attempts
         137097 embryonic connections dropped
 udp:
        7 with bad checksum
 
the complete netstat can be found in:
http://www1.cr.freebsd.org/~jose/netstat-sf


One can assume that the server is that target for some stupid guy, 
BUT the thing is that IS the server the one SENDING the miscalculated 
packages.

I saw that with sshd connections, smtps, auths, etc.., the client sent
the handshake but the server was replying with wrong packages.

It occurs with different window-sizes, different flags, the network card
is an em:
em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        options=3<RXCSUM,TXCSUM>
	media: Ethernet autoselect (100baseTX <full-duplex>)
with two ip addresses in the same subnet (alias with /32 netmask)
no hardware failures reported.

It sends bad packages from both addresses.

Is there any bug I'm not aware of with this driver ?

-- 
Jose Hidalgo Herrera <jose@hostarica.com>
Corp. Hostarica

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