Date: Thu, 09 Mar 2006 15:51:02 +0100 From: Ruben van der Zwan <freebsd-net@m0z.net> To: Gleb Smirnoff <glebius@FreeBSD.org>, freebsd-net@freebsd.org Subject: Re: Carp: checksum failed on em0 Message-ID: <441040D6.3070006@m0z.net> In-Reply-To: <20060309132618.GD1102@FreeBSD.org> References: <440F56F4.1070509@m0z.net> <20060309132618.GD1102@FreeBSD.org>
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Your remark about the switch being the problem made me think :) I captured the packets with tcpdump which resulted in some announces from an IP transit provider. The len of 20 was something I found also in that packet, so I'll send the logs to the provider, asking them to look into it. I don't believe it's something carp is causing, it's just reporting about the packets... Anyhow, thanks for your time! Gleb Smirnoff wrote: > On Wed, Mar 08, 2006 at 11:13:08PM +0100, Ruben van der Zwan wrote: > R> I have 2 routers running carp: > R> > R> router1: > R> ifconfig_carp0="vhid 1 pass hYYgtsRE 192.168.1.1/24" > R> ifconfig_carp0_alias0="vhid 1 pass hYYgtsRE 192.168.2.1/24" > R> router2: > R> ifconfig_carp0="vhid 1 advskew 100 pass hYYgtsRE 192.168.1.1/24" > R> ifconfig_carp0_alias0="vhid 1 advskew 100 pass hYYgtsRE 192.168.2.1/24" > R> > R> There are vlan's present on the routers, but the 192.168.1.2/2.2 for > R> router1 and 192.168.1.3/2.3 for router2 IP addresses are present on an > R> em0 interface. > R> > R> /var/log/messages (on both router1 and router2) is flooded with these > R> messages: > R> Mar 8 21:53:58 router1 kernel: carp_input: checksum failed on em0 > R> Mar 8 21:53:58 router1 kernel: carp_input: received len 20 < > R> sizeof(struct carp_header) > R> once every second... > > It looks like you are receiving bad packets on wire. Can you please run > tcpdump and capture the CARP announces. How do they look like? > > You can also try to change the switch, the NICs and see whether it helps. > > >
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