Hi. On Wed, Apr 08, 2015 at 12:00:59AM +0200, Vincent Lefevre wrote: > > I now get: > > unreachable 2001:4b98:dc0:45:216:3eff:fe9b:eb2f from :: dev lo table unspec > proto kernel src 2001:1::21f:29ff:fe04:3efb metric 4294967295 error -101 > > like on the other machines, i.e. the problem has disappeared without > doing anything special.
No. There was special part (see below). > > So, the kernel tries to route your request via the link-local > > address. That's weird, I'd expect such behavior if your host > > accepted Routing Advertisement, but you say that all you have is > > 'scope global' (RA-assigned addresses are 'scope tentative'). > > I also have the usual "scope link" one. What I've said is that's the > only machine where I have a "scope global" address (but I can now see > that this isn't the cause of the problem). Another machine on the same > network (but under Debian/stable and with a different config) doesn't > have such a "scope global" address; so, I was wondering whether this > was expected. I was wrong above then. You experienced Router Advertisement aka SLAAC (Stateless address autoconfiguration). > > Can I see the output of the following, please: > > > > ip -6 a l dev eth0 > > ypig:~> ip -6 a l dev eth0 > 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 > inet6 2001:1::21f:29ff:fe04:3efb/64 scope global mngtmpaddr dynamic > valid_lft 2557017sec preferred_lft 569817sec This. Every time you see this - that means your host received an advice to configure IPv6 address from an advertised network and to use the sender as a router. Your host's routing table shows exactly the same. SLAAC is a good thing if the host that advertises RA is an actual router. If it is not - you get exactly the behavior you got. The correct way to deal with this then is to disable accepting RAs on your host: echo 1 > /proc/sys/net/ipv6/conf/all/accept_ra Reco -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20150407224157.GA32441@x101h
