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<h1 class="topictitle1">Example: DHCP and PPP profile on different iSeries servers</h1>
<div><p>You can learn how to set up two iSeries™ servers as the network DHCP server
and a DHCP/BOOTP relay agent for two LANs and remote dial-in clients.</p>
<div class="section"><p>The previous example, PPP and DHCP on a single iSeries server,
shows how to use PPP and DHCP on a single iSeries server to permit dial-in clients
access to a network. Whether it is the physical layout of your network or
security concerns, it might be more desirable to have the PPP and DHCP servers
separated or to have a dedicated PPP server without DHCP services. The following
figure represents a network that has dial-in clients but the PPP and DHCP
policies are on different servers.</p>
<div class="fignone"><span class="figcap">Figure 1. DHCP and PPP profile on
different iSeries servers</span><br /><img src="rzakg506.gif" alt="DHCP and PPP profile on different iSeries servers." /><br /></div>
<p>The Remote Data Entry clients dial into the iSeries PPP server. The PPP profile on
that server must have a remote IP address method of DHCP like in the previous
example as well as IP Forwarding in the PPP profile and the TCP/IP stack properties.
Furthermore, because this server is acting as a DHCP relay agent, the BOOTP/DHCP
relay agent TCP/IP server must be on. This allows the iSeries Remote Access server to pass
on DHCP DISCOVER packets to the DHCP server. The DHCP server will then respond
and distribute TCP/IP information to the dial-in clients through the PPP server.</p>
<p>The
DHCP server is responsible for distributing IP addresses to both the 10.1.1.0
and 10.1.2.0 networks. In the Data Entry network, it will give out IP addresses
from 10.1.2.10 to 10.1.2.40 to either dial-in or directly-attached network
clients. The data entry clients also need a router address (option 3) of 10.1.2.1
to communicate with the Work network and the iSeries DHCP server must also have IP
forwarding enabled.</p>
<p>Also, the Local Interface IP address in the PPP
profile must be an IP address that falls within the subnet definition in the
DHCP server. In this example, the PPP profile Local Interface address should
be 10.1.2.2. This address should also be excluded from the DHCP server's address
pool so that it is not assigned to a DHCP client. The Local Interface IP address
must be an address to which the DHCP server can send reply packets to.</p>
</div>
<div class="section"><h4 class="sectiontitle">Planning the DHCP setup for DHCP with a DHCP relay agent</h4>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" 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 colspan="2" valign="top" id="d0e70">Object</th>
<th valign="top" width="43.95973154362416%" id="d0e72">Value</th>
</tr>
</thead>
<tbody><tr><td rowspan="3" valign="top" width="12.416107382550337%" headers="d0e70 ">Configuration options </td>
<td valign="top" width="43.624161073825505%" headers="d0e70 ">option 1: Subnet mask </td>
<td valign="top" width="43.95973154362416%" headers="d0e72 ">255.255.255.0 </td>
</tr>
<tr><td valign="top" width="43.624161073825505%" headers="d0e70 ">option 6: Domain name server </td>
<td valign="top" width="43.95973154362416%" headers="d0e72 ">10.1.1.1 </td>
</tr>
<tr><td valign="top" width="43.624161073825505%" headers="d0e70 ">option 15: Domain name</td>
<td valign="top" width="43.95973154362416%" headers="d0e72 ">mycompany.com </td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e70 ">Is the server performing DNS updates?</td>
<td valign="top" width="43.95973154362416%" headers="d0e72 ">No</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e70 ">Is the server supporting BOOTP clients?</td>
<td valign="top" width="43.95973154362416%" headers="d0e72 ">No</td>
</tr>
</tbody>
</table>
</div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 2. Subnet for Work Network</caption><thead align="left"><tr><th colspan="2" valign="top" id="d0e111">Object</th>
<th valign="top" width="44.25675675675676%" id="d0e113">Value</th>
</tr>
</thead>
<tbody><tr><td colspan="2" valign="top" headers="d0e111 ">Subnet name</td>
<td valign="top" width="44.25675675675676%" headers="d0e113 ">WorkNetwork</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e111 ">Addresses to manage</td>
<td valign="top" width="44.25675675675676%" headers="d0e113 ">10.1.1.3 - 10.1.1.150</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e111 ">Lease time</td>
<td valign="top" width="44.25675675675676%" headers="d0e113 ">24 hours (default)</td>
</tr>
<tr><td valign="top" width="12.162162162162163%" headers="d0e111 ">Configuration options </td>
<td valign="top" width="43.58108108108108%" headers="d0e111 ">Inherited options</td>
<td valign="top" width="44.25675675675676%" headers="d0e113 ">Options from Global configuration</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e111 ">Subnet addresses not assigned by server</td>
<td valign="top" width="44.25675675675676%" headers="d0e113 ">none</td>
</tr>
</tbody>
</table>
</div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 3. Subnet for Data Entry Network</caption><thead align="left"><tr><th colspan="2" valign="top" id="d0e152">Object</th>
<th valign="top" width="44.41624365482234%" id="d0e154">Value</th>
</tr>
</thead>
<tbody><tr><td colspan="2" valign="top" headers="d0e152 ">Subnet Name</td>
<td valign="top" width="44.41624365482234%" headers="d0e154 ">DataEntry</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e152 ">Addresses to manage</td>
<td valign="top" width="44.41624365482234%" headers="d0e154 ">10.1.2.10 - 10.1.2.40</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e152 ">Lease time</td>
<td valign="top" width="44.41624365482234%" headers="d0e154 ">24 hours (default)</td>
</tr>
<tr><td rowspan="2" valign="top" width="11.928934010152284%" headers="d0e152 ">Configuration options </td>
<td valign="top" width="43.65482233502538%" headers="d0e152 ">option 3: Router </td>
<td valign="top" width="44.41624365482234%" headers="d0e154 ">10.1.2.1 </td>
</tr>
<tr><td valign="top" width="43.65482233502538%" headers="d0e152 ">Inherited options</td>
<td valign="top" width="44.41624365482234%" headers="d0e154 ">Options from Global configuration</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e152 ">Subnet addresses not assigned by server</td>
<td valign="top" width="44.41624365482234%" headers="d0e154 "><p>10.1.2.1 (Router)<br />
10.1.2.15 (Remote Data Entry client's local interface IP address)<br />
10.1.2.14 (Remote Data Entry client's local interface IP address)</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section"><h4 class="sectiontitle">Other setup on the iSeries server running PPP</h4><ul><li>Set up the BOOTP/DHCP relay agent TCP/IP server
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="90%" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" width="55.778894472361806%" id="d0e205">Object</th>
<th valign="top" width="44.221105527638194%" id="d0e207">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="55.778894472361806%" headers="d0e205 ">Interface address</td>
<td valign="top" width="44.221105527638194%" headers="d0e207 ">10.1.2.2</td>
</tr>
<tr><td valign="top" width="55.778894472361806%" headers="d0e205 ">Relay packets to Server IP address</td>
<td valign="top" width="44.221105527638194%" headers="d0e207 ">10.1.2.1</td>
</tr>
</tbody>
</table>
</div>
</li>
<li>Set the Remote IP address method to DHCP in the PPP receiver connection
profile <ol><li>Enable DHCP WAN client connection with a DHCP server or relay connection
using the Services menu item for Remote Access Services in iSeries Navigator</li>
<li>Select to Use DHCP for the IP address assignment method under the TCP/IP
Settings Properties of the Receiver Connection Profile in iSeries Navigator</li>
</ol>
</li>
<li>Allow remote system to access other networks (IP forwarding) under the
TCP/IP Settings Properties of the Receiver Connection Profile in iSeries Navigator
(to allow the remote clients to communicate with the Data Entry Network)</li>
<li>Enable IP datagram forwarding under the Settings Properties of the TCP/IP
Configuration in iSeries Navigator
(to allow the remote clients to communicate with the Data Entry Network)</li>
</ul>
</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="relconcepts"><strong>Related concepts</strong><br />
<div><a href="rzakgconceptrelayrouter.htm" title="You might need to use a DHCP relay agent in your network; sometimes a router is sufficient. You can use both a DHCP relay agent and a router to efficiently and securely transfer data throughout the network.">Relay agents and routers</a></div>
<div><a href="rzakgplanningdemands.htm" title="You can plan for most of the DHCP setup by looking at your network topology, the devices on the network (for example, routers), and how you want to support your clients in DHCP.">Network topology considerations</a></div>
</div>
<div class="relref"><strong>Related reference</strong><br />
<div><a href="rzakgscenario5.htm" title="You can learn how to set up the iSeries server as a DHCP server for a LAN and a remote dial-in client.">Example: PPP and DHCP on a single iSeries server</a></div>
</div>
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