rtadvd and carp

[Sergey Kandaurov]

On 1 March 2011 02:28, User Red35 <red35 at zyni.com> wrote:
>
> I am getting started with IPv6 and I am trying to get rtadvd working on
> the carp interface but it is not working so far.
>
>
> ### I have carp failover between two firewalls.  The default gateway for
> ###    hosts internal to the firewall is 172.31.98.103 for IPv4
> ###    and 2001:470:dead:98::103 for IPv6
>
>    # ifconfig carp1
>    carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
>            inet 172.31.98.103 netmask 0xffffffff
>            inet6 2001:470:dead:98::103 prefixlen 64
>            nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
>            carp: MASTER vhid 1 advbase 1 advskew 60
>    #
>
>
> ### rtadvd does not work since carp1 does not have a link local address
>
>
>    # rtadvd -f -D carp1
>    rtadvd[13262]: <make_packet> link-layer address option has null length on carp1.  Treat as not included.
>    rtadvd[13262]: <ra_timer_update> RA timer on carp1 is set to 16:0
>    rtadvd[13262]: <sock_open> IPV6_JOIN_GROUP(link) on carp1: Can't assign requested address
>    #
>
>
> ### Per RFC 4861 Router advertisements are supposed to use
> ###     link-local addresses...  carp does not have one.
>
>
>    ###########################################################################
>    ### http://tools.ietf.org/html/rfc4861#page-39
>    ###########################################################################
>
>        Section 6.1.2
>
>            IP Source Address is a link-local address.  Routers must use
>            their link-local address as the source for Router Advertisement
>            and Redirect messages so that hosts can uniquely identify
>            routers.
>
>    ###########################################################################
>
>
> Is it possible to manually add the link-local address to a carp interface
> via ifconfig (or other utility)?
>
> I assume given the carp MAC 00:00:5e:00:01:01 the link-local address would
> look like this?
>
> fe80::200:5eff:fe00:101
>
> Has anyone got anything similar working?
>

I'm afraid you need to specify carpdev for the carp interface to
manage this work.
As far as I know, FreeBSD doesn't support carpdev (yet).

-- 
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