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Old 07-29-2004, 01:03 PM   #1
Kernel_Daemon
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Registered: Apr 2004
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iptables


Hello everyone,

Does anybody know how can I use pptp/gre nat/conntrack module for iptables.

What I have to do to enable this thing to work?

Please help.

Thanx in advance.
 
Old 07-29-2004, 01:51 PM   #2
Technoslave
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you have to load the modules in order for it to work, those are kernel modules, not iptables modules.

Once those are loaded, it's just a matter of setting up your iptables correctly.
 
Old 07-29-2004, 02:09 PM   #3
Kernel_Daemon
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Thank you.
any examples of a simple configuration? The problem is VPN connection
 
Old 08-01-2004, 04:22 AM   #4
peter_robb
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Registered: Feb 2002
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Have a look at www.poptop.org They have the pptp server..
and http://pptpclient.sourceforge.net/ for the client software

The kernel modules will need to be built in a new kernel, using the patch-o-matic-ng system.
You will also need iptables sources at the same time and to make new iptables executables,
and a modutils package to match the new kernel major/minor numbers.
(So you may also want to try out some other patch-o-matic patches as well to enhance iptables a lot.)

To allow more than 1 client in the lan to connect at the same time, do
modprobe ip_nat_pptp This loads both pptp modules and any other necessary ones.

Make sure the ip stream on port 1723 and prototocol 47 (GRE) are not 'mangled' in any way, eg TTL changed etc
Depending on your chain POLICYs, you may have to make a rule allowing tcp port 1723 and protocol 47 out,
but usually loading just the modules is enough for lan clients, with an incoming/forward rule allowing ESTABLISHED,RELATED connections in. (=standard rules)

Getting GRE to work properly with the pptp server can either be very easy, or frustratingly difficult.
When making the new kernel, make GRE, broadcast on GRE and multicast routing in the kernel rather than modules. Also make the Cryptographic models in the kernel. In the netfilter section, make everything modules and add the pptp verbose debug option.

Last edited by peter_robb; 08-01-2004 at 04:37 AM.
 
  


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