"Load Balance" / Dual ADSL Configuration on Cisco 1841 using same ISP.
Posted on 2007-12-05
I have noticed several EE posts on this topic (and others outside EE) but I cannot seem to find a definitive answer on the topic of running a "load balanced / split load" setup using two seperate ADSL feeds from the same ISP (or different ISP's for that matter).
I have followed the suggestions of enabling "ip cef" on the box, creating and testing both ADSL links (both work fine as a standalone ADSL setup) and then trying to setup two default routes to the seperate line interfaces as many have discussed - but this is where I get stuck.
Once I enable this dual 0.0.0.0 entry using the same weighting, nothing flows. I suspect this is down to the NAT'ing which I cannot seem to get to work with both the lines - only one at a time and with one default route. I've read elsewhere about possibly using route-maps which I'm not 100% conversant with to be honest, or using OER (I think that's correct?) to correct this setup - some suggesting to use the Cisco for the dual part and NAT'ing on another backend box.
Can anyone supply a copy of a working config in this scenario or point me in the direction of other info to look at, as I would prefer to try and keep it all on the same box if at all possible - greedy I know! :o)