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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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2002-11-09 19:10:22 +01:00
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content="text/html; charset=windows-1252">
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<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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<title>DHCP</title>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0"
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style="border-collapse: collapse;" bordercolor="#111111" width="100%"
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id="AutoNumber1" bgcolor="#3366ff" height="90">
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<tbody>
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<tr>
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<td width="100%">
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<h1 align="center"><font color="#ffffff">DHCP</font></h1>
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</td>
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</tr>
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</table>
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<h2 align="left">If you want to Run a DHCP Server on your firewall</h2>
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<ul>
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<li>
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<p align="left">Specify the "dhcp" option on each interface to be served
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by your server in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
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file. This will generate rules that will allow DHCP to and from your firewall
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system. </p>
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</li>
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<li>
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<p align="left">When starting "dhcpd", you need to list those interfaces
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on the run line. On a RedHat system, this is done by modifying /etc/sysconfig/dhcpd.
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</p>
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</li>
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</ul>
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<h2 align="left">If a Firewall Interface gets its IP Address via DHCP</h2>
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<ul>
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<li>
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<p align="left">Specify the "dhcp" option for this interface in the
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<a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
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file.<2E>This will generate rules that will allow DHCP to and from your firewall
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system. </p>
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</li>
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<li>
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<p align="left">If you know that the dynamic address is always going to
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be in the same subnet, you can specify the subnet address in the interface's
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entry in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
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file. </p>
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</li>
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<li>
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<p align="left">If you don't know the subnet address in advance, you should
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specify "detect" for the interface's subnet address in the <a
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href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a> file
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and start Shorewall after the interface has started. </p>
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</li>
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<li>
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<p align="left">In the event that the subnet address might change while
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Shorewall is started, you need to arrange for a "shorewall refresh"
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command to be executed when a new dynamic IP address gets assigned to
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the interface. Check your DHCP client's documentation. </p>
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</li>
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</ul>
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2002-11-09 19:10:22 +01:00
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<p align="left"><font size="2">Last updated 11/03/2002 - <a
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href="support.htm">Tom Eastep</a></font></p>
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<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
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<20> <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font></p>
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<br>
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<br>
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</body>
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2002-11-09 19:10:22 +01:00
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</html>
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