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<h1 class="topictitle1">Step 4: Create the interface to enable proxy ARP</h1>
<div><div class="section"> <p>To create the TCP/IP interface to enable proxy ARP, complete
these steps:</p>
</div>
<ol><li class="stepexpand"><span>Obtain a contiguous block of IP addresses that are routable by
your network.</span> <p>Since you have two partitions in this virtual
Ethernet, you need a block of four addresses. The fourth segment of the first
IP address in the block must be divisible by four. The first and last IP addresses
of this block are the subnet and broadcast IP addresses are unusable. The
second and third IP address can be used for the TCP/IP interfaces for the
virtual Ethernet on partition A and partition B. For this procedure, the IP
address block is <samp class="codeph">10.1.1.72</samp> through <samp class="codeph">10.1.1.75</samp> with
a subnet mask of <samp class="codeph">255.255.255.252</samp>.</p>
<p>You also need a single
IP address for your external TCP/IP address. This IP address does not have
to belong to your block of contiguous addresses, but it must be within the
same original subnet mask of <samp class="codeph">255.255.255.0</samp>. In this procedure,
the external IP address is <samp class="codeph">10.1.1.15</samp>.</p>
</li>
<li class="stepexpand"><span>Create an i5/OS™ TCP/IP interface for partition B. This interface
is known as the external, proxy ARP IP interface. To create the interface,
follow these steps:</span><ol type="a"><li><span>On the command line on partition B, type <kbd class="userinput">CFGTCP</kbd>,
and then press Enter to see the Configure TCP/IP panel.</span></li>
<li><span>Select option 1 (Work with TCP/IP Interfaces), and then press
Enter.</span></li>
<li><span>Select option 1 (Add), and then press Enter to see the Add TCP/IP
Interface (ADDTCPIFC) panel.</span></li>
<li><span>At the <em>Internet address</em> prompt, type <kbd class="userinput">'10.1.1.15'</kbd>.</span></li>
<li><span>At the <em>Line description</em> prompt, type the name of your
line description, such as ETHLINE.</span></li>
<li><span>At the <em>Subnet mask</em> prompt, type <kbd class="userinput">'255.255.255.0'</kbd>.</span></li>
</ol>
</li>
<li class="stepexpand"><span>Start the interface. On the Work with TCP/IP Interfaces panel,
select option 9 (Start) by the interface.</span></li>
</ol>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzai2proxyarp.htm" title="This proxy Address Resolution Protocol (ARP) method uses transparent subnetting to associate a partition's virtual interface with an external interface. Proxy ARP function is built into the TCP/IP stack. If you have the necessary IP addresses, this approach is recommended.">Proxy Address Resolution Protocol method</a></div>
<div class="previouslink"><strong>Previous topic:</strong> <a href="rzai2arpdataforward.htm">Step 3: Turn on IP datagram forwarding</a></div>
<div class="nextlink"><strong>Next topic:</strong> <a href="rzai2arpcreatevethifcprim.htm">Step 5: Create the virtual TCP/IP interface on partition A</a></div>
</div>
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