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<h1 class="topictitle1">Example: PPP and DHCP on a single iSeries server</h1>
<div><p>You can learn how to set up the iSeries™ server as a DHCP server for a
LAN and a remote dial-in client.</p>
<div class="section"><p>Remote clients, such as dial-in clients, often require access
to a company's network. Dial-in clients can gain access to an iSeries server
with PPP. To access the network, the dial-in client will need IP information
just like any direct-attached network client. An iSeries DHCP server can distribute IP
address information to a PPP dial-in client just like it is any other directly
attached client. The following figure shows a remote employee that needs to
dial into the company's network to do some work.</p>
<div class="fignone"><span class="figcap">Figure 1. PPP and DHCP
on a single iSeries server</span><br /><img src="rzakg505.gif" alt="PPP and DHCP on a single iSeries server." /><br /></div>
<p>For the remote employee to successfully become part of the company's
network, the iSeries server
must use a combination of Remote Access Services and DHCP. The Remote Access
Services function creates the the dial-in capability for the iSeries server.
If set up properly, after the worker establishes the dial-in connection, the
PPP server tells the DHCP server to distribute TCP/IP information to the worker.</p>
<p>In
this example, a single DHCP subnet policy covers both the on-site network
clients and the dial-in clients.</p>
<p>If you want your PPP profile to defer
to the DHCP for IP distribution, you must do so in the PPP profile. In the
TCP/IP settings of the receiver connection profile, you must set the Remote
IP address assignment method from Fixed to DHCP. To allow the dial-in clients
to communicate with other network clients like the LAN printer, you must also
allow IP forwarding in the TCP/IP settings of the profile and the TCP/IP configuration
(stack) properties. If you only set IP forwarding on in the PPP profile, the iSeries server
will not pass the IP packets. You must set IP forwarding on in both the profile
and stack.</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 10.1.1.1.
This address should also be excluded from the DHCP server's address pool so
that it is not assigned to a DHCP client.</p>
</div>
<div class="section"><h4 class="sectiontitle">Planning the DHCP setup for on-site and PPP clients</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="d0e63">Object</th>
<th valign="top" width="43.624161073825505%" id="d0e65">Value</th>
</tr>
</thead>
<tbody><tr><td rowspan="3" valign="top" width="12.751677852348994%" headers="d0e63 ">Configuration options</td>
<td valign="top" width="43.624161073825505%" headers="d0e63 ">option 1: Subnet mask</td>
<td valign="top" width="43.624161073825505%" headers="d0e65 ">255.255.255.0</td>
</tr>
<tr><td valign="top" width="43.624161073825505%" headers="d0e63 ">option 6: Domain name server</td>
<td valign="top" width="43.624161073825505%" headers="d0e65 ">10.1.1.1</td>
</tr>
<tr><td valign="top" width="43.624161073825505%" headers="d0e63 ">option 15: Domain name</td>
<td valign="top" width="43.624161073825505%" headers="d0e65 ">mycompany.com</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e63 ">Is the server performing DNS updates?</td>
<td valign="top" width="43.624161073825505%" headers="d0e65 ">No</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e63 ">Is the server supporting BOOTP clients?</td>
<td valign="top" width="43.624161073825505%" headers="d0e65 ">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 both on-site and dial-in clients</caption><thead align="left"><tr><th colspan="2" valign="top" id="d0e104">Object</th>
<th valign="top" width="43.91891891891892%" id="d0e106">Value</th>
</tr>
</thead>
<tbody><tr><td colspan="2" valign="top" headers="d0e104 ">Subnet Name</td>
<td valign="top" width="43.91891891891892%" headers="d0e106 ">MainNetwork</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e104 ">Addresses to manage</td>
<td valign="top" width="43.91891891891892%" headers="d0e106 ">10.1.1.3 - 10.1.1.150</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e104 ">Lease time</td>
<td valign="top" width="43.91891891891892%" headers="d0e106 ">24 hours (default)</td>
</tr>
<tr><td valign="top" width="12.5%" headers="d0e104 ">Configuration options</td>
<td valign="top" width="43.58108108108108%" headers="d0e104 ">Inherited options</td>
<td valign="top" width="43.91891891891892%" headers="d0e106 ">Options from Global configuration</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e104 ">Subnet addresses not assigned by server</td>
<td valign="top" width="43.91891891891892%" headers="d0e106 ">10.1.1.1 (Local interface address specified in the TCP/IP Settings
of the Receiver Connection Profile properties in iSeries Navigator)</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section"><h4 class="sectiontitle">Other setup</h4><ul><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.</li>
<li>Enable IP datagram forwarding under the Settings Properties of the TCP/IP
Configuration in iSeries Navigator.</li>
</ul>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiyscenarios.htm" title="The scenarios in this topic help you understand how PPP works, and how you can implement a PPP environment in your network. These scenarios introduce fundamental PPP concepts from which beginners and experienced users can benefit before they proceed to the planning and configuration tasks.">Scenarios</a></div>
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