Workaround for problems with RA (was: Re: Unwanted RA on LAN)

Leen Besselink leen at
Fri Mar 11 11:14:32 CET 2011

Hi folks,

Sorry for hijacking this thread.

I haven't given this a lot of thought and checked the protocols or
operating system support so sorry if it is a stupid comment.

Is it possible to workaround these problems with DHCP on IPv4 by adding
2 routes like: and
And send 2 routes like 0::0/1 and 8000::0/1 along with RA or DHCPv6 ?

Wouldn't that mean you have the more specific prefix when someone
announces or 0::0/0 by accident ?

I don't know if these protocols allow this or which operating systems
support this but couldn't this workaround help prevent disruption ?

I did see an option static-routes in dhcp-options (5) and list of
prefixes in radvd.conf (5)

Someone probably already tried this with IPv4 I'm sure.

Have a nice day,

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