Re: v6 subnet size for DSL & leased line customers

["Stephen Sprunk" <stephen () sprunk org>]

Thus spake <sthaug () nethelp no>
> > In places where you need tighter control over the usage of various
> > gateways on a common L2 segment, VRRP probably makes more
> > sense.  However, as things currently stand, that means static routing
> > configuration on the host since for reasons passing understanding,
> > DHCP6 specifically won't do gateway assignment.
>
> For those of us with lots of IPv4 customers dependent on DHCP, it
> would be good to know more detail about this point. What is the
> problem, and are there plans to do anything about it in DHCPv6?

For most hosts, there is no need for anything like VRRP or getting a default 
gateway via DHCP in v6 because all hosts are required to implement RA/RS. 
The vast majority of hosts either have one default gateway or two-plus 
equivalent ones, so that works fine.  For hosts with multiple gateways that 
are unequal, VRRP+DHCP doesn't solve the problem any better than RA/RS; you 
have to fiddle with the hosts' routing tables to get things set up right.

S

Stephen Sprunk         "God does not play dice."  --Albert Einstein
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