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proxy for clients behind firewall

By p.kruger ·
Our clients are behind a firewall with an address that is not valid to our company network. Our network has a dmz with webservers. these addresses are valid on our company network.
We are using MS Proxy 2.0 for NAT to be able to browse the companies extranet with our clients.
This extranet does not always has URL addressing but uses mostly company internal ip addresses.

Now we get the possibility to browse the internet through a proxy server which uses port 8080.
If we configure our proxyserver as upstream we cannot connect to the extranet or the intranet anymore.

Can someone tell me if it is possible to configure proxy server to use another proxy, but with the exception of for example 10.* addresses?

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proxy for clients behind firewall

by Joseph Moore In reply to proxy for clients behind ...

Since you are using MSProxy, I am gonna assume you are using Windows clients (WinNT/2K/XP or the dreaded 9x/ME line).
If so, then you can configure Internet Explorer to exclude certain IP ranges from going through your proxy server.
In IE, clickTools -> Internet OPtions -> Connections tab ->LAN Settings button.
In the Proxy Server section of the window, you put in the IP address and port of your proxy. Ok. Now, click the Advanced button.
The new window has a Servers section, where you can specify what proxy server to use with different services (http and ftp can go out different proxies!). But you need the Exceptions section. In the text box under where it says "Do not use proxy server for addresses beginning with:" type in 10.*.*.*and click OK.

That is it. That will NOT route 10.x.x.x through the proxy.

hope this helps

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proxy for clients behind firewall

by p.kruger In reply to proxy for clients behind ...

Sorry, but this answer does not help.
Our internal client addresses are not valid on our company network and need to be NATted (where we currently use the proxy for) to make them valid on our companies extranet. Only 1 proxy can be specified in IE and if we specify the proxy to the internet, than the intranet and extranet are not accessible anymore.

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