IPv6 aliases don't work on carp interface

[Gleb Smirnoff]

  Denis,

On Wed, Oct 31, 2012 at 02:59:48PM +0600, tsaregorodtsev.denis at itmh.ru wrote:
t> I've run into a problem while adding IPv6 aliases on carp interface on FreeBSD 8.1.
t> All IPv6 aliases on carp interface are unreachable from other devices but the first IPv6 on carp interface works well.
t> 
t> # ifconfig
t> em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
t> 	options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
t> 	ether 00:50:56:ad:00:5f
t> 	inet 172.16.249 netmask 0xffffff00 broadcast 255.255.255.224
t> 	inet6 2001:db8:af:ff01:1:be60:80:700 prefixlen 64
t> 	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
t> 	media: Ethernet autoselect (1000baseT <full-duplex>)
t> 	status: active
t> ipfw0: flags=8801<UP,SIMPLEX,MULTICAST> metric 0 mtu 65536
t> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
t> 	options=3<RXCSUM,TXCSUM>
t> 	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
t> 	inet6 ::1 prefixlen 128
t> 	inet 127.0.0.1 netmask 0xff000000
t> 	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
t> carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
t> 	inet6 2001:db8:af:ff01:1:be60:80:70f prefixlen 128
t> 	inet6 2001:db8:af:ff01:1:be60:80:70e prefixlen 128
t> 	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
t> 	carp: MASTER vhid 250 advbase 1 advskew 0
t> 
t> # ping6 2001:db8:af:ff01:1:be60:80:70f
t> PING 2001:db8:af:ff01:1:be60:80:70f(2001:db8:af:ff01:1:be60:80:70f) 56 data bytes
t> 64 bytes from 2001:db8:af:ff01:1:be60:80:70f: icmp_seq=1 ttl=59 time=0.793 ms
t> 64 bytes from 2001:db8:af:ff01:1:be60:80:70f: icmp_seq=2 ttl=59 time=0.837 ms
t> 
t> # ping6 2001:db8:af:ff01:1:be60:80:70e
t> PING 2001:db8:af:ff01:1:be60:80:70e(2001:db8:af:ff01:1:be60:80:70e) 56 data bytes From 2001:db8:af:ff00::1 icmp_seq=1 Destination unreachable: Address unreachable From 2001:db8:af:ff00::1 icmp_seq=4 Destination unreachable: Address unreachable
t> 
t> If I delete both IPs and add inet6 2001:db8:af:ff01:1:be60:80:70e before inet6 2001:db8:af:ff01:1:be60:80:70f then 2001:db8:af:ff01:1:be60:80:70e does work and 2001:db8:af:ff01:1:be60:80:70f does not.
t> 
t> I googled this issue and found a patchhttp://lists.freebsd.org/pipermail/freebsd-net/2011-August/029619.html
t> I've tried to apply it but the problem still exists. I've tested this issue on FreeBSD9.1 RC2 as well and there was the same problem.

This should work on 10-CURRENT, where the carp(4) had been significantly rewritten.

-- 
Totus tuus, Glebius.