Re: Multihoming an end user

[Pete Templin <petelists@templin.org>]

Dan M. MacNeil wrote:

> Also, if as was the case with the OP, ISP1# cuts service off explicitly 
> and deliberately for political reasons, they are also likely to suddenly 
> stop routing.
>
> How would such a cut-off effect the whole 
> ARIN/ASN/BGP/magic-beyond-my-humble-understanding thing?

The OP's inbound traffic would shift to 100% over ISP2.  Outbound 
traffic depends on the routing policy in place at OP's network, and 
could result in blackholed traffic in some scenarios.

Politically, ISP1 could contact ISP2 and/or its upstreams and request 
that they stop honoring the announcement, but most ISPs will allow you 
to announce their address space through another ISP for 90 days after 
you leave, so this shouldn't be a major risk.

pt