Re[2]: using Net8 through NAT router

> I am trying to connect to a database on the "inside" of a NAT.
> I get a tns connection time-out error. According to Oracle, I have to use
> Connection Manager. I find this a little hard to believe. I would think a
> CISCO router doing NAT would be smart enough to translate Net8 packet headers
> for me.
>
> Anyone?

We ran into problems with some implementations of dynamic NAT. The dynamic NAT kept a table of which internal address was attached to which connection of the single external address. Everything was cool as long as the number of connections were small. But as connections (of all types) increased the table filled. Then when a new connection was made, older connections were dropped unceremoniously. Dynamic NAT's of this sort are useful for things like surfing where connections are very ephemeral, but not persistent client/server connections.

The solution? With this particular router, a static NAT, where each client that needed an individual external IP. That's the only way this router would lock an entry in the translation table. Other routers/firewals/proxy servers may have other methods -- but I didn't investigate further.

-rje

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Author: Robert Eskridge
  INET: bryny_at_dfweahs.net

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