Date: Mon, 31 Jan 2005 10:30:05 -0600 From: Jose Hidalgo Herrera <jose@hostarica.com> To: Hackers-FreeBSD <freebsd-hackers@freebsd.org> Subject: TCP stack errors 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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