RE: Secure communication between WAN links

["William Sheehan" <william.sheehan () openinterface com>]

If you are indeed limited to just Windows Server 2003 machines and no
3rd-party software, then you will want to use RRAS (Routing and Remote
Access Service) that comes with Windows 2003.  Basically set up one Windows
2003 server on each network, configure RRAS on both, and set up a VPN tunnel
between the two.  Here are a couple links to get you started:

http://www.microsoft.com/technet/itsolutions/network/vpn/default.mspx

and, for your particular scenario:

http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/
networking/vpndpls2.mspx

You will have to decide between PPTP/MPPE and L2TP/IPSec as the
communication protocol(s).  Go with whichever one you understand more;  both
are secure (MPPE can do 40, 56, and 128-bit; IPSec can do DES 56-bit or 3DES
168-bit), although IPSec will probably take more initial time due to the
certificate setup required.  My personal recommendation is to go with IPSec
because the knowledge will prove very useful if (when?) you eventually
consider different solutions.

William Sheehan
Network Administrator
Open Interface North America

-----Original Message-----
From: Epidemic SomeGuy [mailto:epidemic.mail () gmail com] 
Sent: Sunday, July 02, 2006 6:39 PM
To: security-basics () securityfocus com
Subject: Secure communication between WAN links


Hi, I am working on an assignment planning and implementing a windows 2003
network. We have a small organisation with departments on different
locations. One of the assignments was to secure the communication between
two sites connected trough WAN links. The question is: What is the "best"
solution to use to secure the communication between these two sites? We can
only use Windows 2003 servers.. no 3rd party software, or hardware based
solutions.. The connection speed between the sites is 256 Kbps. I guess an
IPSEC tunnel or something like that is the right way to go, but i don't have
any experience doing this, and I want to be sure I'm implementing it the
right way. I have googled a while, but I cant find any articles describing
my choices,  and how to correctly install and implement it. (not enough to
make an intelligent decision anyway).

Sorry about my bad English and thanks for your help!

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