The stupidity of trying to "fix" DHCPv6

Leo Bicknell bicknell at
Tue Jun 14 21:24:48 UTC 2011

In a message written on Tue, Jun 14, 2011 at 05:01:24PM -0400, Ben Jencks wrote:
> > Lastly, there's a hidden bit here many people haven't dealt with
> > yet in lab networks.  In IPv4 critical environments it's typical
> > to use HSRP or VRRP to provide a single gateway across two routers.
> > The IPv6 way to do this is to have both advertise RA's, possibly
> > with different priorities.
> Erm, I thought the IPv6 way to do it was to use IPv6 VRRP... I've heard of some vendor bugs on it, but it's implemented.

You can do VRRPv6 (now, finally, on some platforms).  However, the
standard way this works is, wait for it, advertising the default
gateway via RA's!

At least you can static route to the VRRPv6 address and that works
without RA's.  Again, it would be nice to give out the address in
DHCPv6 and not need RA's at all, but alas there is no default route
field in DHCPv6.

       Leo Bicknell - bicknell at - CCIE 3440
        PGP keys at
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