[c-nsp] Load balancing across 2 ADSL lines

[Daniel Holme]

James O'Farrell wrote:
> I am looking to load balanced across 2 ADSL lines either both coming
> into the same router or using 2 separate routers, any thoughts would be
> much appreciated.

The best way to do this on one router is (providing your provider 
support it on their DSL aggregation device(s)) using MLPPP. PPP will 
load balance frames across both circuits quite well and is a neat, clean 
configuration.

You could have issues with the whole 'latency creates buffering and CPU 
issues' but in my experience it's been OK. I've done this with 1721 and 
2801, using 2 and 3 circuits, all in one bundle.

Your provider will need to terminate your sessions using (probably) L2TP 
and multilink across the interfaces it creates for each circuit you 
connect up into the bundle.

As for two seperate routers, you open up another can of worms there, 
maybe start thinking about combinations of tunneling and cef load 
balancing and other dirty hacks :/


-- 
Dan Holme