Date: Sat, 4 Dec 2021 09:59:29 +0100 From: Kurt Jaeger <pi@freebsd.org> To: freebsd-net@freebsd.org Subject: why multi-hop icmp redirects to 0.0.0.0 on 13.0 ? Message-ID: <Yast8d1dRd7ZFWr3@fc.opsec.eu>
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Hi! We (AS12502) recently upgraded one router from 12.2.x to 13.0.x. This caused some surprising effect, with the router sending out icmp redirects to 0.0.0.0 over multiple hops: Example: inet ------ wan:rtr1:lan ------ rtr2 ------ wan:host x.x.x.1 y.y.y.1 host sends a packet to z.z.z.z and receives an icmp redirect from x.x.x.1 like this: 10:20:16.889185 IP x.x.x..1 > y.y.y.1: ICMP redirect z.z.z.z to host 0.0.0.0, length 48 This has been stopped by net.inet.ip.redirect=0 on rtr1, but my question is: Why is rtr1 sending those multi-hop icmp redirects at all ? -- pi@FreeBSD.org +49 171 3101372 Now what ?
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