On 15/07/07 05:48, Andrew Morton wrote: > On Sat, 14 Jul 2007 15:34:31 -0700 (PDT) [EMAIL PROTECTED] wrote: > >> http://bugzilla.kernel.org/show_bug.cgi?id=8756 > > It is unclear which kernel version this applies to?
Linus' 2.6 tree, as of Mon Jul 9 15:50:56 2007 -0700 For some reason it says "Version: 2.5" on the email and "Version: " on the website... > >> Summary: Route advmss copied to ALL routes when interface MTU >> changes >> Product: Networking >> Version: 2.5 >> Platform: All >> OS/Version: Linux >> Tree: Mainline >> Status: NEW >> Severity: normal >> Priority: P1 >> Component: IPV6 >> AssignedTo: [EMAIL PROTECTED] >> ReportedBy: [EMAIL PROTECTED] >> >> >> Steps to reproduce: >> 1. Have multiple network devices and routes for them with standard (low, i.e. >> 1500) MTUs and default ADVMSS (e.g. 1440) >> 2. Change the MTU on one of them to something high (e.g. 7200) >> 3. The ADVMSS is incorrectly set for ALL routes based on the new MTU of the >> interface that changed. >> >> Note: if addrconf is running then the ADVMSS will be reset on the next RA, so >> this will impede attempts to reproduce. >> >> # ip -6 r >> fe80::/64 dev sit0 metric 256 expires 4481744sec mtu 1480 advmss 1440 >> hoplimit 4294967295 >> fe80::/64 dev ppp0 metric 256 expires 19071345sec mtu 1500 advmss 1440 >> hoplimit 4294967295 >> fe80::/64 dev eth0 metric 256 expires 19072430sec mtu 1500 advmss 1440 >> hoplimit 4294967295 >> default dev ppp0 metric 1024 expires 19071347sec mtu 1500 advmss 1440 >> hoplimit 4294967295 >> >> # ifconfig eth0 mtu 7200 >> >> # ip -6 r >> fe80::/64 dev sit0 metric 256 expires 4481732sec mtu 1480 advmss 7140 >> hoplimit 4294967295 <-- wrong >> fe80::/64 dev ppp0 metric 256 expires 19071334sec mtu 1500 advmss 7140 >> hoplimit 4294967295 <-- wrong >> fe80::/64 dev eth0 metric 256 expires 19072419sec mtu 7200 advmss 7140 >> hoplimit 4294967295 <-- correct >> >> Explicitly setting the MTU on these other routes (although this is not >> possible >> without having to add another route due to bug 8755) automatically sets >> ADVMSS >> appropriately. >> -- Simon Arlott - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
