mirror of
https://gitlab.com/shorewall/code.git
synced 2024-12-03 21:13:29 +01:00
dbfc838988
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@789 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
85 lines
3.3 KiB
HTML
85 lines
3.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||
<html>
|
||
<head>
|
||
<meta http-equiv="Content-Language" content="en-us">
|
||
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
|
||
<meta name="ProgId" content="FrontPage.Editor.Document">
|
||
<meta http-equiv="Content-Type"
|
||
content="text/html; charset=windows-1252">
|
||
<title>VPN</title>
|
||
</head>
|
||
<body>
|
||
<h1 style="text-align: center;">VPN<br>
|
||
</h1>
|
||
<p>It is often the case that a system behind the firewall needs to be
|
||
able to access a remote network through Virtual Private Networking
|
||
(VPN). The two most common means for doing this are IPSEC and PPTP. The
|
||
basic setup is shown in the following diagram:</p>
|
||
<p align="center"><img border="0" src="images/VPN.png" width="568"
|
||
height="796"> </p>
|
||
<p align="left">A system with an RFC 1918 address needs to access a
|
||
remote network through a remote gateway. For this example, we will
|
||
assume that the local system has IP address 192.168.1.12 and that the
|
||
remote gateway has
|
||
IP address 192.0.2.224.</p>
|
||
<p align="left">If PPTP is being used, there are no firewall
|
||
requirements beyond the default loc->net ACCEPT policy. There is one
|
||
restriction however: Only one local system at a time can be connected
|
||
to a single remote gateway unless you patch your kernel from the
|
||
'Patch-o-matic' patches available at
|
||
<a href="http://www.netfilter.org">http://www.netfilter.org</a>. </p>
|
||
<p align="left">If IPSEC is being used then only one system may connect
|
||
to the remote gateway and there are firewall configuration requirements
|
||
as follows:</p>
|
||
<blockquote>
|
||
<table border="1" cellpadding="2" style="border-collapse: collapse;"
|
||
bordercolor="#111111" id="AutoNumber2" height="98">
|
||
<tbody>
|
||
<tr>
|
||
<td height="38"><u><b>ACTION</b></u></td>
|
||
<td height="38"><u><b>SOURCE</b></u></td>
|
||
<td height="38"><u><b>DESTINATION</b></u></td>
|
||
<td height="38"><u><b>PROTOCOL</b></u></td>
|
||
<td height="38"><u><b>PORT</b></u></td>
|
||
<td height="38"><u><b>CLIENT<br>
|
||
PORT</b></u></td>
|
||
<td height="38"><u><b>ORIGINAL<br>
|
||
DEST</b></u></td>
|
||
</tr>
|
||
<tr>
|
||
<td height="19">DNAT</td>
|
||
<td height="19">net:192.0.2.224</td>
|
||
<td height="19">loc:192.168.1.12</td>
|
||
<td height="19">50</td>
|
||
<td height="19"> </td>
|
||
<td height="19"> </td>
|
||
<td height="19"> </td>
|
||
</tr>
|
||
<tr>
|
||
<td height="19">DNAT</td>
|
||
<td height="19">net:192.0.2.224</td>
|
||
<td height="19">loc:192.168.1.12</td>
|
||
<td height="19">udp</td>
|
||
<td height="19">500</td>
|
||
<td height="19"> </td>
|
||
<td height="19"> </td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</blockquote>
|
||
<p>If you want to be able to give access to all of your local systems
|
||
to the remote network, you should consider running a VPN client on your
|
||
firewall. As starting points, see <a
|
||
href="http://www.shorewall.net/Documentation.htm#Tunnels">
|
||
http://www.shorewall.net/Documentation.htm#Tunnels</a> or <a
|
||
href="http://www.shorewall.net/PPTP.htm">http://www.shorewall.net/PPTP.htm</a>.</p>
|
||
<p><font size="2">Last modified 12/21/2002 - <a href="support.htm">Tom
|
||
Eastep</a></font></p>
|
||
<p><font face="Trebuchet MS"><a href="copyright.htm"> <font size="2">Copyright</font>
|
||
<EFBFBD> <font size="2">2002 Thomas M. Eastep.</font></a></font></p>
|
||
<p> </p>
|
||
<br>
|
||
<br>
|
||
</body>
|
||
</html>
|