Someone trying to replace some latvian boxes with bgpd/npppd mentioned
a problem with v6 on carp interfaces in 'backup' state where their
address was used as source address, despite there being an address
on the carpdev which was up.
I don't have a proper v6 carp setup handy to test but got a test
machine into a state with 'ifconfig carp0 down' (which seems should be
a close enough equivalent to 'carp backup' for tests) which did
indeed consider the 'down' carp interface as a source address.
It can be bodged around with pltime 0 of course, but from looking at
in6_selectsrc() I don't see why it wouldn't just pick the address
from the interface associated with the route i.e. the one on em0..
but then I must be missing something as I don't see where pltime 0
is handled either... does anyone have clues?
# ifconfig em0
em0:
flags=48b43<UP,BROADCAST,RUNNING,PROMISC,ALLMULTI,SIMPLEX,MULTICAST,INET6_NOPRIVACY>
mtu 1500
lladdr f0:de:f1:f9:a7:52
priority: 0
groups: egress
media: Ethernet autoselect (1000baseT full-duplex)
status: active
inet6 fe80::f2de:f1ff:fef9:a752%em0 prefixlen 64 scopeid 0x1
inet6 2001:8b0:648e:cc01:f2de:f1ff:fef9:a752 prefixlen 64 autoconf
pltime 604697 vltime 2591897
inet 85.158.44.149 netmask 0xfffffff0 broadcast 85.158.44.159
# ifconfig carp0
carp0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:00:5e:00:01:01
priority: 0
carp: INIT carpdev em0 vhid 1 advbase 1 advskew 0
groups: carp
status: invalid
inet6 fe80::200:5eff:fe00:101%carp0 prefixlen 64 scopeid 0xa
inet6 2001:8b0:648e:cc01:200:5eff:fe00:101 prefixlen 64 detached
autoconf pltime 604690 vltime 2591890
inet6 2001:8b0:648e:cc01:5c46:9730:9899:1008 prefixlen 64 detached
autoconf autoconfprivacy pltime 81660 vltime 600216
inet6 2001:8b0:648e:cc01::ca1f prefixlen 64
# $ route -n get -inet6 2001:8b0:648e:cc01:20d:b9ff:fe04:a330
route to: 2001:8b0:648e:cc01:20d:b9ff:fe04:a330
destination: 2001:8b0:648e:cc01::
mask: ffff:ffff:ffff:ffff::
interface: em0
if address: fe80::f2de:f1ff:fef9:a752%em0
priority: 4 (connected)
flags: <UP,DONE,CLONING>
use mtu expire
0 0 0
# ping6 jodrell
PING6(56=40+8+8 bytes) 2001:8b0:648e:cc01::ca1f -->
2001:8b0:648e:cc01:20d:b9ff:fe04:a330
^C
--- jodrell.spacehopper.org ping6 statistics ---
3 packets transmitted, 0 packets received, 100.0% packet loss
# netstat -rnfinet6|grep -e 2001:8b0:648e:cc01 -e carp0
2001:8b0:648e:cc01::/64 link#1 UC 7
0 - 4 em0
2001:8b0:648e:cc01::1 00:0d:b9:17:0c:c4 UHLc 0
5 - 4 em0
2001:8b0:648e:cc01::ca1f link#1 UHLc 1
0 - 4 em0
2001:8b0:648e:cc01:200:5eff:fe00:101 00:00:5e:00:01:01 UHL
0 0 - 4 lo0
2001:8b0:648e:cc01:20d:93ff:fe63:da5a 00:0d:93:63:da:5a UHLc
1 8 - 4 em0
2001:8b0:648e:cc01:20d:b9ff:fe04:a330 00:0d:b9:17:0c:c4 UHLc
0 3 - 4 em0
2001:8b0:648e:cc01:5c46:9730:9899:1008 00:00:5e:00:01:01 UHL
0 0 - 4 lo0
2001:8b0:648e:cc01:f2de:f1ff:fef9:a752 f0:de:f1:f9:a7:52 UHLc
0 0 - 4 lo0
fe80::%carp0/64 link#10 UC 12
0 - 4 carp0
fe80::200:5eff:fe00:101%carp0 00:00:5e:00:01:01 UHL 0
0 - 4 lo0
fe80::20d:93ff:fe63:da5a%carp0 00:0d:93:63:da:5a UHLc 0
2 - 4 carp0
fe80::20d:b9ff:fe17:cc4%carp0 00:0d:b9:17:0c:c4 UHLc 0
0 - 4 carp0
ff01::%carp0/32 link#10 UC 0
0 - 4 carp0
ff02::%carp0/32 link#10 UC 2
0 - 4 carp0
ff02::1:ff04:a330%carp0 link#10 UHLc 0
0 - 4 carp0
ff02::1:ff63:da5a%carp0 link#10 UHLc 0
0 - 4 carp0
