[CentOS] routing multiple network cards on a single subnet

> 
> I have had a number of people ask me why I want this 
> arrangement, where I have two modems on a single outbound subnet.
> 
> This is (going to be) a server with limited upload bandwidth. 
>  By having two outbound connections, I can use a round robin 
> dns entry to share the load between the two connections and 
> increase my capacity.
> --

Frank,

do both internet feeds come from the same ISP?

DSL? Cable?

if DSL, get a 3620 and two ADSL Wics and work with the ISP to bond the DSL's
together and remove one of the server nics out of the equation.

 - rh