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<td bgcolor="#336666"><font face="Arial" size="2" color="#FFFFFF"><b>1.2</font></b></td>
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<td bgcolor="#336666" width="100%"><b>
<font face="Arial" size="2" color="#FFFFFF">DHCP</font></b></td>
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<td bgcolor="#669999" height="25"><b><font face="Arial" size="2" color="#FFFFFF">
1.2.2</font></b></td>
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<td bgcolor="#669999" height="25" width="100%"><b>
<font face="Arial" size="2" color="#FFFFFF">BOOTP and DHCP differences</font></b></td>
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<font face="Arial" size="2">The Internet community first developed the
BOOTP protocol to enable configuration of diskless workstations. BOOTP
was originally defined in RFC 951 in 1985. As the predecessor of DHCP,
BOOTP shares some operational characteristics. Both protocols are
client/server based and use UDP ports 67 and 68. Those ports are still
known as BOOTP ports.</font><p><font face="Arial" size="2">The four
basic IP parameters:</font><ul>
<li><font face="Arial" size="2">IP address</font></li>
<li><font face="Arial" size="2">Gateway address</font></li>
<li><font face="Arial" size="2">Subnet mask</font></li>
<li><font face="Arial" size="2">DNS server address</font></li>
</ul>
<p><font face="Arial" size="2">BOOTP does not dynamically
allocate IP addresses to a host. When a client requests an IP address, the BOOTP server
searches a predefined table for an entry that matches the MAC address
for the client. If an entry exists, then the corresponding IP address
for that entry is returned to the client. This means that the binding
between the MAC address and the IP address must have already been
configured in the BOOTP server.</font><p><font face="Arial" size="2">
There are two primary differences between DHCP and BOOTP:
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font><ul>
<li><font face="Arial" size="2">DHCP defines mechanisms through
which clients can be assigned an IP address for a finite lease
period. This lease period allows for reassignment of the IP address
to another client later, or for the client to get another
assignment, if the client moves to another subnet. Clients may also
renew leases and keep the same IP address.</font></li>
<li><font face="Arial" size="2">DHCP provides the mechanism for a
client to gather other IP configuration parameters, such as WINS and
domain name. </font>
</li>
</ul>
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<p><font color="#808080">
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<b>Web Links</b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>BootP Relay Agent Overview<p>
<a target="_blank" href="http://support.baynetworks.com/library/tpubs/html/router/soft1200/117362AA/A_28.HTM#MARKER-9-90">
http://support.baynetworks.com/library/
tpubs/html/ router/ soft1200/117362AA/
A_28.HTM#MARKER-9-90</a></font></p>
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