Date: Sun, 21 Oct 2001 12:36:52 +1000 (EST) From: Rowan Crowe <rowan@sensation.net.au> To: freebsd-isp@freebsd.org Subject: Re: arplookup failed: Message-ID: <Pine.BSF.4.21.0110211233190.36258-100000@velvet.sensation.net.au> In-Reply-To: <Pine.BSF.4.21.0110202137310.727-100000@veager.jwweeks.com>
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On Sat, 20 Oct 2001, Jim Weeks wrote: > Would someone please check me on this. I know this has been discussed > before and I want to make sure I understand correctly. > > I am receiving the following error, > > Oct 20 21:16:21 server /kernel: arplookup XXX.XXX.XXX.XXX failed: host is > not on local network > > Indeed the server issuing the request is not on the same subnet. If I > understand arp correctly, the kernel is not able to respond to a mac > address not directly connected to the subnet of the responding machine. > > After looking at the results of "tcpdump -n -e -p arp", I see a lot of > traffic from several subnets. Should I be seeing arp requests other than > those initiated by my default gateway or other machines on the same > subnet? Hi Jim, I had this problem when REPLY packets from a host on a different subnet, but same physical wire, were arriving directly back at my box, rather than via the gateway for its own subnet. Presumably the remote host thought it could be smart by bypassing the gateway. See where a traceroute from the other server goes? Cheers. -- Rowan Crowe camrecord.com / camdiscover.com / Sensation Internet Services Melbourne, Australia To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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