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Old 05-03-2008, 03:57 AM   #1
Registered: Oct 2007
Location: Netherlands, ZH
Posts: 32

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Question outbound VPN's fail (pptp/l2tp/ipsec)

Hi there.

Fist of all, I did google for it, but I only get results that don't match my config.

My situation is as follows: <----------> / <--->
Pub. VPN Server [FC6 Firewall/Router] WinXP SP2 Client

The FC6 router does the NAT etc. with IPTables for the internal 172-LAN.
The problem is that I can't connect to the public VPN server from my WinXP Client. For now I tried around 20 combo's of IPTables rules to get the VPN working but I failed in all ways.

On the client I tried it with the default windows VPN client and also with a third-party IPSEC-VPN client, but just no go.

I hope someone is willing to help me out with this?!

All the result I did find on the internet are based on the situation that the VPN-Server is behind an IPTables firewall. Which is not the case with me.

Old 05-03-2008, 04:09 AM   #2
Registered: Feb 2008
Location: JHB South Africa
Distribution: Centos, Kubuntu, Cross LFS, OpenSolaris
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are you connecting from the inside or the outside ? Your diagram seems to indicate that your winxp client is on the lan.
Old 05-21-2008, 03:33 PM   #3
Registered: Oct 2007
Location: Netherlands, ZH
Posts: 32

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Hi datopdog,

I'm connecting from the inside (, the XP-Client is indeed the connecting client.
Hope you can help me!

Old 05-21-2008, 03:55 PM   #4
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Look at your system logs on both sides.

Use a tool like ethereal to monitor the traffic. Although you can't read it, you can see who's talking to whom.


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