Date: Fri, 7 Jan 2011 06:17:47 -0500 (EST) From: Daniel Eischen <deischen@freebsd.org> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: freebsd-current@freebsd.org Subject: Re: UDP checksum broken, -head and releng_8 Message-ID: <Pine.GSO.4.64.1101070613200.20933@sea.ntplx.net> In-Reply-To: <20110107103837.E14966@maildrop.int.zabbadoz.net> References: <Pine.GSO.4.64.1101070412140.19838@sea.ntplx.net> <20110107103837.E14966@maildrop.int.zabbadoz.net>
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On Fri, 7 Jan 2011, Bjoern A. Zeeb wrote: > On Fri, 7 Jan 2011, Daniel Eischen wrote: > >> When sending multicast packets to a socket that is _not_ >> bound to the multicast address, this generates bad UDP >> checksums. This use to work and was broke sometime between >> the middle of October and late December as far as I can >> tell. > > My very best guess would be: r215110 It doesn't look very harmful, but I'll try backing it out. > Otherwise the usual questions apply though I am almost certain you got > that right: > > - dumps taken on the receiver side not the sender as Yes, dumps were taken on both receiving Solaris 10 and FreeBSD hosts. > - NIC offload capabilities might confuse tcpdump and you might > want to turn them off and test as well w/o them Disabling checksum offloading makes no difference, and the problem occurs on all interfaces I have tested (sis, bfe, wpi). -- DE
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