Portable IP space, isolated networks, BGP, etc... (fwd)

Brandon Ross bross at mindspring.net
Fri Dec 10 01:27:37 UTC 1999

On Thu, 9 Dec 1999, Daniel Golding wrote:

> It works just fine with isolated networks. Just advertise the portions of
> the address space you are using out each EBGP connections.

Assuming of course each block of address space is big enough to stand on
it's own when compared with other's BGP filters (see other thread).  If
all the parts put together are big enough, but they're not big enough
individually, as long as you're using the same transit provider in each
location, you can ask them to aggregate the advertisement together for you
to present to the rest of the world (which you should do anyway if you can
to be a good Internet citizen).

Of course, you'll need to make sure that you have default routes pointed
out the transit connections in each site or you won't be able to get
traffic to and from your other sites due to BGP loop detection.

> Overlapping this space with isolated networks falls under the category
> of bad mojo. 

Not necessarily, as long as you're aware of exactly what you're doing.

Brandon Ross            Network Engineering     404-815-0770 800-719-4664
Director, Network Engineering, MindSpring Ent., Inc.  info at mindspring.com
                                                            ICQ:  2269442
Read RFC 2644!
Stop Smurf attacks!  Configure your router interfaces to block directed
broadcasts. See http://www.quadrunner.com/~chuegen/smurf.cgi for details.

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