On Wed, 15 Dec 2010 10:28:05 +0100 Jan wrote:
JS> This could work, needs some testing though. And if you have list of IP 
JS> addresses of an interface, you probably can get broadcast addresses (or 
JS> netmask) easily.

true.

JS> The problem is not to get this information, the real 
JS> challenge is to do it effectively, i.e. cache them somewhere, refresh 
JS> the cache sometimes, look up in the cache effectively, ... Or do we want 
JS> to run netlink query on every outgoing UDP message?

The ifTable code is already caching information about interfaces, so that's a
good candidate for where to do it. If the 15 second refresh window is too
long, then netlink might be an option. hopefully we could register to find out
when the interface address details have changed, instead of having to do
something for every packet.


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