On Fri, Nov 28, 2014 at 06:34:33PM -0500, Geoff Steckel wrote: > When an interface is given an IP6 address in anew rdomain, > lo0 is named in various routes when that table is queried > via netstat -r -f inet > > Does the pseudo-interface lo0 actually "exist" in multiple > routing tables simultaneously, or does the name 'lo0' > signify an otherwise anonymous point to hang the extra > routes defined when any address is configured in a rdomain?
lo(4) is a bit special since it will bounce back the traffic it got unmodified. Because of this lo0 can be abused by a different rdomain. But this is something we don't want and AFAIK mpi@ is on the way to change the use of lo0 in IPv6 local addresses. There are still some issues with IPv6 and rdomains (mainly with ND). > ----- > river:5626$ sudo ifconfig re2 rdomain 3 > river:5627$ netstat -rn -f inet6 -T 3 > Routing tables > > river:5629$ sudo ifconfig re2 inet6 2002:1234:4567::0 > prefixlen 64 rdomain 3 > river:5630$ netstat -rn -f inet6 -T 3 > Routing tables > > Internet6: > Destination Gateway > Flags Refs Use Mtu Prio Iface > 2002:1234:4567:: 00:30:18:ab:ee:49 > HL 0 0 - 4 lo0 > 2002:1234:4567::/64 link#3 > C 0 0 - 4 re2 > fe80::%re2/64 link#3 > C 0 0 - 4 re2 > fe80::230:18ff:feab:ee49%re2 00:30:18:ab:ee:49 > HL 0 0 - 4 lo0 > ff01::%re2/32 link#3 > C 0 0 - 4 re2 > ff02::%re2/32 link#3 > C 0 0 - 4 re2 > ------ > > In a more complex case, lo0 exists with a route but was never > configured in this rdomain. > > This is part of my implementation > of an ip6 tunnel endpoint. The endpoint IP6 address must not > be used as a source address from my net so that address is > in a separate routing domain. pf transfers packets between > the domains. > > ------ > netstat -rn -f inet6 -T 1 > Routing tables > > Internet6: > Destination Gateway > Flags Refs Use Mtu Prio Iface > default 2001:4830:xxxx:xxx::1 > UGS 0 427 - 8 gif0 > ::1 link#7 > UHL 0 0 - 4 lo0 > 2001:4830:xxxx:xxx::1 2001:4830:xxxx:xxx::2 > UH 1 61 - 4 gif0 > 2001:4830:xxxx:xxx::2 link#10 > UHL 0 0 - 4 lo0 > fe80::%lo1/64 fe80::1%lo1 > U 0 0 - 4 lo1 > fe80::1%lo1 link#7 > UHL 0 0 - 4 lo0 > fe80::%gif0/64 link#10 > UC 0 0 - 4 gif0 > fe80::230:18ff:feab:ee47%gif0 link#10 > UHL 0 0 - 4 lo0 > ff01::%lo1/32 fe80::1%lo1 > UC 0 0 - 4 lo1 > ff01::%gif0/32 link#10 > UC 0 0 - 4 gif0 > ff02::%lo1/32 fe80::1%lo1 > UC 0 0 - 4 lo1 > ff02::%gif0/32 link#10 > UC 0 0 - 4 gif0 > > If this is not the intended behavior, I can dig into > the code - this would be in the ip6 route add code? > > If it should be sent there I'll copy this to tech@ > > thanks > Geoff Steckel > -- :wq Claudio
