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Old 07-16-2003, 12:49 PM   #1
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Question Protocol 47 and Port Forwarding

Good Afternoon,

I am new to Linux. There is a machine on my network running as a gateway. It uses IP Chains, and port forwarding is on.

I want to set up a VPN -- I have the software all ready to go, and mostly tested. The only thing left for me to do is forward the port for external IP addresses to be redirected to the VPN's IP address.

From what I've read, my VPN server runs on port 1723. I've entered a command in IPchains (this is an old Linux box) to forward port 1723 to IP address (the VPN server).

Now, I'm not even sure if that worked.

How would I, in IPChains, set up port forwarding to my VPN server? I want only those ports necessary for a Windows XP Pro VPN server to be accessible to the outside world (hence, the VPN).

I also read something about making sure protocol 47 is enabled or forwarded to the VPN server. I'm not sure what that is supposed to mean.

Can anyone shed some light on my dark situation? I'm in need of some serious help!

Old 07-16-2003, 01:41 PM   #2
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Post Clarification


Allow me to be more clear. Here is my current network setup:

1. My network is a peer-to-peer network without a domain controller. No DHCP, no DNS; machines simply supply as their gateway and specify their own static IP address (192.168.1.x).

2. My VPN server is a windows XP professional machine (IP It only has one network interface.

3. The machines on the network use as their default gateway (for internet access).

4. is my Linux box gateway, it has two network cards. One interface is internal (eth1 -, and the other is external (eth0 - 64.x.x.x)

I want to give outside IP addresses access to the VPN server (which is behind the linux gateway) .

How do I use IPChains to route port 1723 to the VPN server? I'm not comfortable upgrading from IPChains to IPTables, so any info on how to do it in IPChains is greatly appreciated.

If anyone knows any other info about Windows XP VPN setup, I'd appreciate a little help.



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