> You can define multiple routes to a network. For example, you may have a
> connection via OzEmail and Access One and define routes through both
> providers. BGP will advertise them both and external clients will choose
> their best route (or possibly load balance between them).
which is why people multi-home for speed and redundancy...
> Ok, so now you have redundant routes to your network. The network can exist
> in multiple physical locations connected by a VLAN link to make it appear
> all on the one subnet. Each of your ISP routes would go to the different
> physical location.
that was my stumbling point... my understanding was that you could
multihome a service (ie. a cluster of MX servers) or a physical box, using
**different IPs**... but having a single IP would need to be the same
connection to a network -> creating a SPF... so is it possible to
multihome using the same IP or does the VLAN allow you to "trick" the
network (and if so, how ?!?) ??
> Now you have one network in two physical locations with a separate route to
> each location. You then create a cluster of machines to respond on a single
> IP address. You connect these through a separate cluster interface and
> situate half the cluster at each location. The interconnect will be
> interesting, but it is possible.
i thought it would have been much easier to have multiple MX records with
identical priority so that mail servers will use them randomly or on a
round-robin...
later
marty
"I can't buy what I want because it's free. Can't be what they want
because I'm me." - Corduroy, Pearl Jam
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