On the subject of multihoming

Tomas L. Byrnes tomb at byrneit.net
Tue Nov 4 18:33:08 CST 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
networks.


>-----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
links
>(in the experiments case multiple consumer 3G connections [to 2
Sprint/2
>Verizon/1 AT&T], Time Warner Cable Modem and an SBC Global DSL
>connection.
>
>What is the best way to do outbound traffic engineering? I would like
to
>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
so
>would need to download a copy, which has the risk of stale data.
Perhaps
>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
>engineering.
>
>
>Thanks.
>
>Charles
>





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