Loadbalance outgoing traffic over two cable modems in same
mel.flynn+fbsd.questions at mailing.thruhere.net
Tue Dec 22 00:46:12 UTC 2009
On Monday 21 December 2009 09:56:11 Nikos Vassiliadis wrote:
> On 12/21/2009 6:03 AM, Mel Flynn wrote:
> > Hi,
> > I've looked over http://www.openbsd.org/faq/pf/pools.html but this
> > assumes two different gateways for the two interfaces.
> > I'm faced with two cable modems from the same ISP, with the same gateway.
> > I can't lagg(4) the interfaces, since specific IP's are bound to specific
> > modems.
> This can probably be fixed from the ISP side. It should probably be some
> antispoofing rule that drops the packets you are sending via the "wrong"
> interface. You could try communicating the problem to the ISP and hope for
> the best...
I'd rather not go that route. However, I might ask the ISP to move swap two
IP's, so that I have two consecutive IPs on two modems and can use /31
notation for the pool. Source hash should then work better.
> > So I'm wondering if using stick-address with a round-robin nat pool is
> > really sufficient to do load balancing of outgoing traffic and not get
> > into session problems with various protocols. Has anybody had similar
> > experiences?
> I have no experience on this, but theoretically a state can expire while
> the upper layers are still active... so, I *think* you may have
> problems... Of course, you could increase the lifetime of states
True, I'm mostly worried about DNS queries and other UDP protocols. TCP should
theoretically be fine.
Thanks for your feedback.
More information about the freebsd-questions