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IP Rounting

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by soekratis 1 view

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I have just got connected to the Internet via DSL modem and i have also use DSL Router from Linksys to share the broadboand connection to some of our network users. The problem is that the DSL router can only support class c submask and while our existing network is class b. To work-around it, i have assigned another IP address with class c submask to those workstation that needs to get connected to the internet via the DSL connection. Though the method works most of the time, it does get problem like unable to access the network (Internet). For example, when the user uses the local network resources for sometime and when try to to access the internet again, it usually lead to unable to access the internet. I suspect it is the routingproblem.

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5 replies

by duwaned

In my opinion, your scenario is unnecessarily complicated.

You could simplify this by setting up a Proxy server with dual network cards between your DSL, and your network. This way you could segment the traffic to the Internet, and allow or disallow Internet access through Proxy server.

This would also sort out your routing issues, as only the Proxy server would require a class C address, and this could be entered as a static entry on the DSL router.

I have done this on several siteswithout any problems. If you need any help setting up the Proxy, give me a shout, and I will be more than happy to help.

Regards.
Duwane

by soekratis

Thanks for the recommendation but due to budget constraint, not able to apply it. Once again, thanks for the prompt respond.

Anyway, i have managed to configure the dsl router to behave properly now. Actually what i did was assigning a scope of IPs to the connecting servers, router and workstation. it works.. once again, thanks you very much.

by leo.valmores

Network setup and infrastructure is absent from your problem description.

Nevertheless, I agree with Answer 1 that you setup sort of proxy server.

Another simplest way is to use WIN2K Pro station and equipped the PC with 2 NIC cards (same brands and specs). Setup NIC_A to connect to the INTERNET thru DSL modem, with the ISP's TCP/IP settings. In one of the tabs of the TCP/IP properties, enable the Internet sharing. You can experiment later to customize which ports to allow/block.
Then, setup NIC_B and give this an available intranet static IP address.

Hope your setup will work.

by soekratis

Actually, the method recommended was my first option. I install Windows 2000 server to one workstation and configured it as a router. Somehow, my exchange server is causing problem with this setup. Once in a while, external sender will encounter " unknown host" error. port forwarding is correctly configured. Strange thing is that the problem only occur once in a while, perhaps several time in a day. Outbound mail have no problem though. Anyway, i have managed to configure the dsl router to behave properly now. Actually what i did was assigning a scope of IPs to the connecting servers, router and workstation. it works.. once again, thanks you very much.

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