On 02/11/15(Mon) 13:56, loth...@iki.fi wrote: > >Synopsis: inet6 route not added for autoconf prefix > >Category: kernel > >Environment: > System : OpenBSD 5.8 > Details : OpenBSD 5.8-current (GENERIC.MP) #1560: Sun Nov 1 > 20:57:59 MST 2015 > > dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP > > Architecture: OpenBSD.amd64 > Machine : amd64 > >Description: > > When configuring an interface for inet6 autoconf and receiving a router > advertisement containing a certain global prefix, a route for that prefix is > not added to the routing table. > > The machine sending the router advertisements in question is OpenBSD > 5.8-stable > (rtadvd running on carp interface), and the prefix information is visible on > the wire: > > 00:00:5e:00:01:09 33:33:00:00:00:01 86dd 166: fe80::200:5eff:fe00:109 > > ff02::1: icmp6: router advertisement(chlim=64, router_ltime=1800, > reachable_time=0, retrans_time=0)(prefix info: LA valid_ltime=2592000, > preferred_ltime=604800, prefix=2001:708:20:e336::/64)(unknown opt_type=25, > opt_len=5)(unknown opt_type=31, opt_len=3) [icmp6 cksum ok] (len 112, hlim > 255) > > (I have been having some inet6 issues with my openbsd workstation behind these > carp+pfsync firewalls for a long while, and while I still need to investigate > further, I believe this is an important piece of the puzzle) > > >How-To-Repeat: > > ifconfig em0 inet6 autoconf > ifconfig em0 # to check your assigned address and prefix length > netstat -rnf inet6 | grep 2001:708:20:e336 # or whatever your prefix is > > Observe that only a host entry exists matching the prefix matching the > global address of the interface. Additionally, 'route get' can be used > to verify that addresses in the same prefix are thought to be behind > the default router: > > # route get 2001:708:20:e336::123 > route to: 2001:708:20:e336::123 > destination: :: > mask: default > gateway: fe80::200:5eff:fe00:109%em0 > > >Fix: > autoconfigured prefixes should be added as on-link routes.
Could you include the output of "netstat -rnf inet6" before and after enabling autoconf on your interface? Thanks, Martin
