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<h1 class="topictitle1">Example: Simple DHCP subnet</h1>
<div><p>You can learn how to set up the iSeries™ server as a DHCP server in a
simple LAN with four PC clients and a LAN-based printer.</p>
<div class="section"><p>The following figure illustrates a simple LAN with a iSeries server,
four PC clients, and a LAN based printer. In this example, the iSeries server
acts as a DHCP server for the 10.1.1.0 IP subnet. It is connected to the LAN
with its 10.1.1.1 interface.</p>
<div class="fignone"><span class="figcap">Figure 1. Simple LAN setup for iSeries server</span><br /><img src="rzakg501.gif" alt="Simple LAN setup for iSeries server." /><br /></div>
<p>With so few PC clients, administrators can easily type in each PC's
IP information statically. They only need to visit four PCs in this case.
Now imagine that the four PCs became 200 PCs. Setting up each PC's IP information
now become a time consuming task that might result in accuracy errors too.
DHCP can simplify the process of assigning IP information to clients. If the
subnet 10.1.1.0 had hundreds of clients, an administrator only have to create
a single DHCP policy on the iSeries server. This policy will distribute IP information
to each client.</p>
<p>When the PC clients send out their DHCP
DISCOVER signals, the iSeries server will respond with the appropriate
IP information. In this example, the company also has a LAN based printer
that obtains its IP information with DHCP too. But because the PC clients
depend on the printer's IP address remaining the same, the network administrator
should account for that in the DHCP policy. One solution will assign a constant
IP address to the printer. The DHCP server allows you to define a client in
the DHCP policy like the LAN printer by its MAC address. In the DHCP client
definition, you can then assign specific values, such as IP addresses and
router addresses, to the intended client.</p>
<p>For a client to communicate
with a TCP/IP network, it requires at least an IP address and subnet mask.
The clients will get their IP address from the DHCP server, and the DHCP server
passes additional configuration information (for example, their subnet mask)
using the configuration options.</p>
</div>
<div class="section"><h4 class="sectiontitle">Planning the DHCP setup for a simple LAN</h4>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Global
configuration options (applies to all clients served by the DHCP server)</caption><thead align="left"><tr><th valign="top" id="d0e60">Object</th>
<th valign="top" id="d0e62">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" headers="d0e60 "><p>Configuration options<br />
<br />
  option 1: Subnet mask<br />
  option 6: Domain name server<br />
  option 15: Domain name</p>
</td>
<td valign="top" headers="d0e62 "> <p><br />
<br />
  255.255.255.0<br />
  10.1.1.1<br />
  mycompany.com</p>
</td>
</tr>
<tr><td valign="top" headers="d0e60 ">Subnet addresses not assigned by server</td>
<td valign="top" headers="d0e62 ">10.1.1.1 (Domain name server)</td>
</tr>
<tr><td valign="top" headers="d0e60 ">Is the server performing DNS updates?</td>
<td valign="top" headers="d0e62 ">No</td>
</tr>
<tr><td valign="top" headers="d0e60 ">Is the server supporting BOOTP clients?</td>
<td valign="top" headers="d0e62 ">No</td>
</tr>
</tbody>
</table>
</div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 2. Subnet for PCs</caption><thead align="left"><tr><th valign="top" id="d0e98">Object</th>
<th valign="top" id="d0e100">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" headers="d0e98 ">Subnet name</td>
<td valign="top" headers="d0e100 ">SimpleSubnet</td>
</tr>
<tr><td valign="top" headers="d0e98 ">Addresses to manage</td>
<td valign="top" headers="d0e100 ">10.1.1.2 - 10.1.1.150</td>
</tr>
<tr><td valign="top" headers="d0e98 ">Lease time</td>
<td valign="top" headers="d0e100 ">24 hours (default)</td>
</tr>
<tr><td valign="top" headers="d0e98 "><p>Configuration options<br />
<br />
Inherited options</p>
</td>
<td valign="top" headers="d0e100 "><p><br />
<br />
   Options from Global configuration</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 3. Client for Printer</caption><thead align="left"><tr><th valign="top" id="d0e133">Object</th>
<th valign="top" id="d0e135">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" headers="d0e133 ">Client Name</td>
<td valign="top" headers="d0e135 ">LANPrinter</td>
</tr>
<tr><td valign="top" headers="d0e133 ">Client Address</td>
<td valign="top" headers="d0e135 ">10.1.1.5</td>
</tr>
<tr><td valign="top" headers="d0e133 "><p>Configuration options <br />
<br />
Inherited options</p>
</td>
<td valign="top" headers="d0e135 "> <p><br />
<br />
  Options from Global configuration</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakgexampleparent.htm" title="By reviewing diagrams and examples of how different networks are set up, you can determine which is the best choice for your installation.">DHCP examples</a></div>
</div>
<div class="relref"><strong>Related reference</strong><br />
<div><a href="rzakgscenario2.htm" title="You can learn how to set up the iSeries server as a DHCP server with two LANs connected by a DHCP-enabled router.">Example: Multiple TCP/IP subnets</a></div>
<div><a href="rzakgscenario3.htm" title="You can learn how to set up the iSeries server as a DHCP server for a LAN that is connected to the Internet by an Internet router.">Example: DHCP and multihoming</a></div>
</div>
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