IPv6 carp trouble

[Ask Bjørn Hansen]

Hi everyone,

I've been setting up IPv6 on the various networks I look after over the last weeks.  Today the turn came to a system that's running two FreeBSD boxes with carp etc.

I added an inet6 address to the ethernet interface and then the 'carp address' to carp0.  The carp address is used by our upstream provider.   Things appear to work except I can't ping the carp address -- even from localhost!

carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
	inet 207.171.2.194 netmask 0xfffffff8 
	inet6 2607:f238:0:11::2 prefixlen 125 
	carp: MASTER vhid 110 advbase 1 advskew 100

If I from the box itself ping this ::2 address, 'tcpdump -nn -i lo0' says:

06:57:47.606443 IP6 2607:f238:0:11::2 > 2607:f238:0:11::2: ICMP6, time exceeded in-transit for 2607:f238:0:11::2, length 64
06:57:47.606472 IP6 2607:f238:0:11::2 > 2607:f238:0:11::2: ICMP6, time exceeded in-transit for 2607:f238:0:11::2, length 64
06:57:47.606502 IP6 2607:f238:0:11::2 > 2607:f238:0:11::2: ICMP6, time exceeded in-transit for 2607:f238:0:11::2, length 64
06:57:47.606531 IP6 2607:f238:0:11::2 > 2607:f238:0:11::2: ICMP6, time exceeded in-transit for 2607:f238:0:11::2, length 64
06:57:47.606560 IP6 2607:f238:0:11::2 > 2607:f238:0:11::2: ICMP6, time exceeded in-transit for 2607:f238:0:11::2, length 64

If I ping the ::2 address from another box, the relevant interface shows the same response.

Any ideas?



 - ask