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

Steinar H. Gunderson sesse at
Wed Mar 16 11:38:40 CET 2011

On Fri, Mar 11, 2011 at 12:20:11PM -0500, Martin Millnert wrote:
>>> .
>> Which OS' do support that?
> At least: Windows & IOS (1), Linux (2,3,4).

Unfortunately RFC4191 router preference isn't really all that useful; it only
controls nexthop selection, not source address selection. In other words, if
you have an RA with a bogus prefix on your network, your clients will still
happily try to send packets from that prefix, even if you have a good RA with
high priority.

I don't think Linux supports the other half of RFC4191 (more-specific routes
in RA).

/* Steinar */
Software Engineer, Google Switzerland

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