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ITKE
16,755 pts.
 NAT without BGP
BGP, Load balancers, NAT
My customer has an 1841 router. FE0/0 connects to his LAN. FE0/1 connects to another ISP, call ISP-A, 2M internet link. He want another 2M from u, ISP-B with load balancing. Can we use same 1841 router with V.35 interface connection and load sharing internet traffic for both ISP-A & ISP-B. Cutomer doesn't have his own IP Block. Without BGP can we do using NAT configuration?

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ASKED: December 3, 2009  7:18 PM
UPDATED: December 4, 2009  2:39 PM
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Answer Wiki:
Without BGP you'll need to setup an IP from each ISP and have DNS entries for each ISP. Then have DNS round robin between the two IPs. Why not just get a faster link from the first ISP?
Last Wiki Answer Submitted:  December 3, 2009  10:09 pm  by  Denny Cherry   64,520 pts.
All Answer Wiki Contributors:  Denny Cherry   64,520 pts.
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Mrdenny: having links from multiple vendors allows for link load balancing (bottlenecks within ISP-A’s infrastructure most likely won’t impact ISP-B’s throughput), fault tolerance (complete and utter failure of ISP-B will still ensure that traffic can be received from ISP-A), and the soft ability to pit A and B against each other in terms of contract negotiation.

Companies whose product stable includes Internet-facing services/applications are wise to have vendor diversity for these reasons (and probably more, these are just the first that come to mind from experience).

Sonotsky
 680 pts.