TCP stack errors
From: Jose Hidalgo Herrera (jose_at_hostarica.com)
Date: 01/31/05
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To: Hackers-FreeBSD <freebsd-hackers@freebsd.org> Date: Mon, 31 Jan 2005 10:30:05 -0600
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 _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
- Previous message: Kamal R. Prasad: "Re: Simple question about CPUs and processes"
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