# Fw: \[Bugme-new\] \[Bug 1176\] New: icmp redirect shuts connexions - From: Andrew Morton \ - Date: 2003-09-02 16:37:42 - List: netdev - Page: https://ratatoskr.run/netdev/2003/09/10736286 - Thread: https://ratatoskr.run/netdev/2003/09/10736286/t.md ```text Begin forwarded message: Date: Tue, 2 Sep 2003 08:49:47 -0700 From: To: Subject: [Bugme-new] [Bug 1176] New: icmp redirect shuts connexions http://bugme.osdl.org/show_bug.cgi?id=1176 Summary: icmp redirect shuts connexions Kernel Version: 2.6.0-test4 Status: NEW Severity: normal Owner: bugme-janitors@lists.osdl.org Submitter: mcousin@sigma.fr Distribution: Gentoo Hardware Environment: PIV 1.7 GHz - 1Gb ns83820 network adapter Software Environment: 2.6.0-test4. gcc version 3.3.1 (Gentoo Linux 3.3.1, propolice). glibc 2.3.2. Problem Description: Connection are dropped every time I get an icmp_redirect Steps to reproduce: Log into a server using the wrong router as your default route. You get an icmp redirect, and manage to connect. At the next icmp_redirect you receive, connexions are lost. I've tested this with having an IRC connexion to the 'mercure' machine . After about 10 minutes, I see a new ICMP redirect arriving (the route cache has expired ?) 64 bytes from mercure.sigma.fr (192.168.1.232): icmp_seq=501 ttl=252 time=0.565 ms 64 bytes from mercure.sigma.fr (192.168.1.232): icmp_seq=503 ttl=252 time=0.575 ms >From 89.133.2.200: icmp_seq=504 Redirect Host(New nexthop: fwsigma.sigma.fr (89.133.2.1)) 64 bytes from mercure.sigma.fr (192.168.1.232): icmp_seq=504 ttl=252 time=1.61 ms 64 bytes from mercure.sigma.fr (192.168.1.232): icmp_seq=505 ttl=252 time=0.596 ms from route -C : before the redirect : marc root # route -C | grep mercure marc mercure.sigma.f fwsigma.sigma.f 0 0 5 eth0 mercure.sigma.f marc marc l 0 0 4 lo marc mercure.sigma.f fwsigma.sigma.f 0 0 470 eth0 marc mercure.sigma.f fwsigma.sigma.f 0 2 5 eth0 mercure.sigma.f marc marc l 0 0 525 lo after the redirect: marc root # route -C | grep mercure mercure.sigma.f marc marc l 0 0 18 lo marc mercure.sigma.f fwsigma.sigma.f 0 0 6 eth0 marc mercure.sigma.f fwsigma.sigma.f 0 1 4 eth0 my routing table: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 89.0.0.0 * 255.0.0.0 U 0 0 0 eth0 loopback localhost 255.0.0.0 UG 0 0 0 lo default 89.133.2.200 0.0.0.0 UG 1 0 0 eth0 My 'usual' route is via 89.133.2.200. To get to mercure, I have to get through 'fwsigma' (89.133.2.1). As soon as I get the ICMP_REDIRECT packet, the connexion to the IRC server is lost. When I add a static route to mercure via fwsigma, the problem disappears... ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ```