Date: Sat, 04 Dec 2021 08:59:29 UTC
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 ?