On the subject of multihoming

Tomas L. Byrnes tomb at byrneit.net
Wed Nov 5 00:33:08 UTC 2008

This sort of thing is usually done with some sort of multi-port outbound
NAT device that chooses the source interface to NAT from based on some
"quality" metric it generates for the destination, and a state table it
keeps for all the outside IPs.

Products that do this include FatPipe, Radware Linkproof, and Mushroom

>-----Original Message-----
>From: Charles Wyble [mailto:charles at thewybles.com]
>Sent: Tuesday, November 04, 2008 12:32 PM
>To: NANOG list
>Subject: On the subject of multihoming
>I'm working on a small experiment which utilizes multiple outbound
>(in the experiments case multiple consumer 3G connections [to 2
>Verizon/1 AT&T], Time Warner Cable Modem and an SBC Global DSL
>What is the best way to do outbound traffic engineering? I would like
>be able to determine the best path possible and send traffic out the
>appropriate link.
>Could this be done with a copy of the BGP tables?
>Obviously as they are consumer connections, I wouldn't get a BGP feed
>would need to download a copy, which has the risk of stale data.
>some sort of multihop BGP setup?
>I have done some research and found a lot of references to small site
>multihoming without BGP for link redundancy but not for traffic

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