Date: Tue, 10 Mar 2015 22:16:24 +0900 From: "George Neville-Neil" <gnn@neville-neil.com> To: "Paul S." <contact@winterei.se> Cc: freebsd-net <freebsd-net@freebsd.org> Subject: Re: FreeBSD responding with wrong receiving interface IP Message-ID: <B70E1152-E492-4B38-B2EE-A5DBF246DEF7@neville-neil.com> In-Reply-To: <54FE566F.5030607@winterei.se> References: <54FE566F.5030607@winterei.se>
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On 10 Mar 2015, at 11:26, Paul S. wrote: > Hi, > > I've been deploying FreeBSD as customer edge routers for customers = > with sites that do not require high throughput (>1g/s). > > Each site has two ISPs (Mostly Telstra + Verizon/Optus), and take full = > routes via OpenBGPd and BIRD. I use next-hop self on all received = > routes. > > The FreeBSD boxes have static routes delegating the announced IP = > blocks to a L3 switch down the road. i.e: route add -net 10.100.1.0/24 = > 10.0.0.1, and then that /24 is originated via BGP to both upstreams. > > Things in general work fine, but I've been receiving reports of 'weird = > traceroute results' from my customers. > > Examples of this would be, > > 1 some.random.isp (...) (...) > 2 gigabitethernet3-3.exi1.melbourne.telstra.net (203.50.77.49) 0.309 = > ms 0.284 ms 0.227 ms > 3 bundle-ether3-100.exi-core10.melbourne.telstra.net (203.50.80.1) = > 1.966 ms 1.675 ms 1.852 ms > 4 bundle-ether12.chw-core10.sydney.telstra.net (203.50.11.124) 16.707 = > ms 15.917 ms 16.360 ms > 5 customer-gw.syd.ALTER.net (...) (...) > > This traceroute seems to claim that the packet was received over the = > Verizon gateway, which in reality it was not -- it was received = > directly over the Telstra interface, but my outbound AS-PATH towards = > some.random.isp uses Verizon. > > So FreeBSD replies back with the Verizon address. Another person = > having the same issue (mostly, but on OpenBSD) can be found at = > http://openbsd.7691.n7.nabble.com/BGP-responding-with-wrong-IP-address-= td90264.html > > I would love to know if there's a way to fix this, or if I've missed = > something, or if there's something wrong in the way I set it up. > > Thank you for taking the time to read. I wonder if we could see some routing tables? That might help. Best, George
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