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Accessing Private Net Addresses from the Public Internet

From mike on Mon, 19 Jul 1999

I'm at my wits end and just wondering if you could help me with this:

I ran out of ip's for my network so I wanted to set up a private 10.0.0.0 network. I wanted to use a Linux box to connect this 10 network to my other network. I have 10 network using IP Masquarding to access the network through the Linux Box and I can get to the outside network from the 10 network, but I can not see the 10 network from the outside.

The linux box has 2 ethernet cards , but I don't think the packets know how at go from eth0 to eth1. Any help or a point in the right direction would be great.

Michael Collins

Of course packets from outside networks can't get to your 10-net addresses. They don't have routes to your private net addresses.

It's not clear, from your message, whether the "outside" network you are talking about is the Internet, or some element of your own internetwork (a LAN under your administrative control).

In any event the usual way to provide access to your internal/private networks from the outside is to configure a proxy server on one of the real IP addresses. The exact details of these proxying services would depend on the specific services and protocols that you wished to propagate through this connection.

Copyright © 1999, James T. Dennis
Published in The Linux Gazette Issue 44 August 1999

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