There is documentation and a quick-and-dirty example in the PF User's Guide:
http://openbsd.org/faq/pf/pools.html#outgoing On Tue, Aug 23, 2011 at 03:00:51AM -0700, elerdin wrote: > Hallo, I have two internet connections and I want to use both with a > round-robin load balancing, only for outgoing connections. I found on > the web various solutions, but I did not manage to modify them for my > scenario. One internet connections is a normal adsl, there is a modem > that I connect to the OpenBSD router, the interface receives the > dynamic IP using dhcp. The other connection has a static IP address > and gateway. Now I'm reading the PF documentation, but while I study I > need a "fast and dirty" solution that "just works". Can someone help > me?