Re: (PM) static IP users

James Sneeringer (jvs@ocslink.com)
Wed, 17 Mar 1999 23:00:34 -0600 (CST)

On Tue, 16 Mar 1999, Hal Dorsman wrote:
| I recall someone saying that you do not want your static IP in your
| dialup pool, that makes sense. But can you, if you have a PM3 with a 48
| IP pool, define a .192 masked subnet (62 hosts), route that to your PM3,
| and use the statics in the range outside of the pool but in that subnet.

You could do that, I suppose, but it's not the preferred method.

| If that is the preferred method, how do you handle a bank of PM3's, when
| you don't know for sure where the static IP user will dial into? At
| busy times, they may roll over into any of the PM's so how do you handle
| routing for the static ranges? Am I missing something obvious here? Is
| this really much simpler that I am thinking?

The preferred method involves running OSPF. Set the Pool to start on a
natural /27 or /28 subnet boundary, and set the pool size to 48. The PM3
will automatically send an announcement in OSPF for a pair of routes for
the pool, a /27 and a /28, covering exactly 48 addresses.

Then assign any IP address as the static address (preferrably from an
unused and as-yet unrouted block), and the PM3 will announce a route for
it in OSPF as well.

-James

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