Not sure what the term is that I'm looking for here, but is it possible to take and combine 2 ISP's into one "connection" each ISP we have different block of IP's assigned and connection types.
*What I'm trying to acomplish, I'll try and give as much detail now as possible"
We currently have an old 1721 Router setup with 2 t-1's that are multilinked together and a half a class C worth of public IP's on it =)
We also are in the process of upgrading to MPLS (from a service provider) and have some adtran router that we connect to the LAN port of to access this network/internet.
Our internal network is 10.0.0.0/16
We purchased a new 2921 ISR G2 and I've set this up to connect to the MPLS network over the giga 0/1 port which is connected to their router. I have 2 extra T-1 WIC's and wanted to know if there is a way to add these to the ISR and then move the other ISP's T-1's into this router and have both WAN links work together and still only have one LAN gateway (10.0.0.1). Basically making my life a little easier while we go through some DNS changes and test the MPLS side.
I read about NAT'ing public IP's to other Public IP's to help during transition times, but not sure this would be the easist way or work?
Or could we just take and setup both WAN links and route 0.0.0.0 0.0.0.0 out ISP A and when connections are made to route ISP B's IP block, will they work ir try to route back out ISP B?
Or is this something that should be KISS and just add 2 static routes for 0.0.0.0 0.0.0.0 ISP A and 0.0.0.0 0.0.0.0 ISP B
ISP A (Public Block A) >>>>>
> RTR-2921 (10.0.0.1)
ISP B (New Public Block)>>>