Date: Wed, 25 Nov 2015 09:29:18 -0800 From: Kevin Oberman <rkoberman@gmail.com> To: Daniel Bilik <ddb@neosystem.org> Cc: Gary Palmer <gpalmer@freebsd.org>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Outgoing packets being sent via wrong interface Message-ID: <CAN6yY1vECcj5_4n0fRv6j-2CUJ8mHDoDaxBkYsKZaornQm2CKg@mail.gmail.com> In-Reply-To: <20151125141626.6f9579478e1b9d0eb1d4a84f@neosystem.cz> References: <20151120155511.5fb0f3b07228a0c829fa223f@neosystem.org> <C1D7F956-81C9-4ED4-99B8-E0C73A3ECB37@FreeBSD.org> <20151120163431.3449a473db9de23576d3a4b4@neosystem.org> <20151121212043.GC2307@vega.codepro.be> <20151122130240.165a50286cbaa9288ffc063b@neosystem.cz> <20151125092145.e93151af70085c2b3393f149@neosystem.cz> <20151125122033.GB41119@in-addr.com> <20151125141626.6f9579478e1b9d0eb1d4a84f@neosystem.cz>
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On Wed, Nov 25, 2015 at 5:16 AM, Daniel Bilik <ddb@neosystem.org> wrote: > On Wed, 25 Nov 2015 12:20:33 +0000 > Gary Palmer <gpalmer@freebsd.org> wrote: > > > When the problem happens, what does the output of > > route -n get <unreachable IP> > > show? > > I'll check this next time it happens. Thanks for the tip. Right now it > seems correct: > > route to: 192.168.2.33 > destination: 192.168.2.0 > mask: 255.255.255.0 > fib: 0 > interface: re1 > flags: <UP,DONE,PINNED> > recvpipe sendpipe ssthresh rtt,msec mtu weight expire > 0 0 0 0 1500 1 0 > > > It would also be worth checking the arp table. > > Yes, checking arp table was one of the first things I did when analyzing > the problem. All arp entries seem correct, and do not change > before-during-after the problem. I've also tried to manually remove arp > entry for affected address (ie. forcing it to be refreshed), but it > does not help. > > -- > Dan Have you looked for ICMP redirect traffic? Does your firewall allow them? If so, could you try adding a rule to block them? I can't provide a sample rule as I don't use pf, but you want to block ICMP type 5 messages. For a good overview of redirects, see either Wikipedia <https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol#Redirect>; or Cisco <http://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13714-43.html>; articles (or Google for many others). -- Kevin Oberman, Part time kid herder and retired Network Engineer E-mail: rkoberman@gmail.com PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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