only enable radv if upstream connection available

[Ondrej Zajicek]

On Thu, Jan 10, 2013 at 12:16:42AM +0100, Stefan Hellermann wrote:
> Hi,
> 
> is it possible to only announce IPv6 RA if you receive a default route
> via another protocol in bird?

This is not currently possible, but it is simple feature that i already
wanted to implement, so could be expected in near future.

Question is how exactly such feature should behave - you could either
withdraw just default route on IPv6 clients, or you could also deprecate
assigned IPv6 addresses. The first behavior is simple and probably useful
in most cases, but it does not help in a case when you have two (or more)
completely independent uplinks (with different assigned IPv6 prefixes),
i.e. non-BGP based multihoming. In that case you would need rules like
like 'propagate this prefix if you received default route from that
protocol'. Perhaps we could just have prefix-specific filters that
decide whether given prefix should be propagated or not (based on
received (default) routes).

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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