Re: Quad DSL

alexd <troffasky@xxxxxxxxxxx> wrote:
Rob wrote:

Outbound load balancing easy? Is there no source address filtering on
ADSL connections in the UK?

I assumed he was using NAT.

Sure, but AFAIK the NAT and load balancing functions in Cisco routers
are independent of eachother. So when you have 4 outgoing lines and
4 default routes the outgoing traffic will be NATted to the 4 external
IPs but the router will not stick to using the correct external IP on
each line. Traffic with address of line 1 will be sent on lines 2-4
as well. Where they will be filtered when source address filtering is
in use.

It looks like the Optimized Edge Routing functionality is a solution
for that problem, but it is complex.
There exist some purpose-built routers from other manufacturers that
were specially developed for the "multiple Internet connections to be
used with failover and balancing in a NAT environment" problem, where
everything works out of the box. Of course they are less flexible than
a Cisco.
.

Relevant Pages

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