shorewall_code/Shorewall-docs/dhcp.htm
2002-08-22 21:21:41 +00:00

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<title>DHCP</title>
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<h1 align="center"><font color="#FFFFFF">DHCP</font></h1>
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<h2 align="left">DHCP Server on your firewall</h2>
<ul>
<li>
<p align="left">Specify the &quot;dhcp&quot; option on each interface to be
served by your server in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
file.</li>
<li>
<p align="left">When starting &quot;dhcpd&quot;, you need to list those
interfaces on the run line. On a RedHat system, this is done by modifying
/etc/sysconfig/dhcpd.</li>
</ul>
<h2 align="left">A Firewall Interface gets its IP Address via DHCP</h2>
<ul>
<li>
<p align="left">Specify the &quot;dhcp&quot; option for this interface in
the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
file.</li>
<li>
<p align="left">If you know that the dynamic address is always going to be
in the same subnet, you can specify the subnet address in the interface's
entry in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
file.</li>
<li>
<p align="left">If you don't know the subnet address in advance, you should
specify &quot;detect&quot; for the interface's subnet address in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
file and start Shorewall after the interface has started.</li>
<li>
<p align="left">In the event that the subnet address might change while
Shorewall is started, you need to arrange for a &quot;shorewall
refresh&quot; command to be executed when a new dynamic IP address gets
assigned to the interface. Check your DHCP client's documentation.</li>
</ul>
<p align="left"><font size="2">Last updated 1/26/2002 - <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">2001, 2002 Thomas M. Eastep.</font></a></font></p>
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