folx,
just to clarify on this issue:
i don't consider what paul described real dual-homing. it's more of a
home and a summer house (but one without internal plumbing and somewhat
drafty walls).
althought it is possible to get your netblock announced on both of the
networks you're 'dual' homed on under the circumstances that he described,
this doesn't really get you the reliability you should be asking for. the
reason is that every international network you're not directly connected
to will properly filter the announcement from the second network and will
only keep the route to your netblock through the first provider. that
means if you connection to PSI goes down, only direct subscribers to your
backup connection will have a functioning route to your network.
real dual homing with real portable address space means that you can get
routes to your netblock announced at the NAPs and propagated across *all*
(or most, when they're working right)of the international backbones. that
means that when one route goes down, traffic still comes through the other
one.
better. a lot better.
the 'single home and a summer cabin' approach works fine for smaller
organizations but it is important to separate that approach from the full
benefits of dual homing.
todd
btw: i'd rather have two carrier-redundant connections to a well-managed,
dual-homed ISP than a two carrier-rudundant connections to an ISP managing
its own national/international backbone any day. that's just me.
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