Multi DSL in small ISP
I'm doing some work for a startup wireless ISP. We have two 1500/256 dsl lines, one is setup to route our subnet to us from the outside world (by our upstream provider). Both lines have fixed ip addresses. Currently we use ML-IP by Stallion in trial mode to aggregate the two services. I can't help but think that we could save ourselves the $1000 and just do the same thing manually. I've seen the examples that use TEQL to load share. Is there anything special that we need to watch for when doing this to ensure we will still get our incoming traffic (bound for our / our customers fixed ip) or does it automagically happen. I am thinking it will just come in on that line and be routed as required but I thought someone may know for sure. I guess we also need to setup NAT on the second line.
Alternatively any good references to multilink dsl setups on fedora ? Our provider can bundle our two lines instead which would be a much sexier approach.