[GRLUG] Multi Home

[Adam Tauno Williams]

On Fri, 2012-07-13 at 14:55 -0400, megadave wrote: 
> Even that will be tricky, as it is likely that both providers have
> filters in place to reject traffic with an origin IP address
> that isnt part of their network.

Correct, you'd need to NAT the source [SNAT] to match the selected path.

You probably also want to ensure you only select from paths that are
available; so you only pick the AT&T path when the Comcrapstic
connection is down.

And it means, in any case, that a circuit-down event *will* cause
current connections to be dropped; at least the connection's SNAT'd to
the down link.

The *only* real way around this is to have your own IPv4 addresses [not
delegated ones] and a BGP AS.  This is one of many reasons IPv6 *ROCKS*
and IPv4 *SUCKS* and SNAT is *EVIL*.  With IPv4, and lacking buckets of
money, you can only achieve kinda-sorta fail-over [despite whatever
bull**** any vendor tries to sell you].

> Another option is to lease said VPS/server, run a VPN/tunnel over each
> of the upstream, bond them together and have all your traffic appear
> at the VPS/server.

Agree, and that works great till the VPS goes down.
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