100 lines
6.0 KiB
HTML
100 lines
6.0 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
|
<meta name="DC.Type" content="task" />
|
|
<meta name="DC.Title" content="Ping the loopback interface on your server" />
|
|
<meta name="abstract" content="Ping the loopback interface to verify that your TCP/IP software is installed, started, and working properly." />
|
|
<meta name="description" content="Ping the loopback interface to verify that your TCP/IP software is installed, started, and working properly." />
|
|
<meta name="DC.Relation" scheme="URI" content="rzakupingcharbased.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzakupingerrors.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzakupingparam.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1997, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1997, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="pingloopback" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Ping the loopback interface on your server</title>
|
|
</head>
|
|
<body id="pingloopback"><a name="pingloopback"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Ping the loopback interface on your server</h1>
|
|
<div><p>Ping the loopback interface to verify that your TCP/IP software
|
|
is installed, started, and working properly. </p>
|
|
<div class="section"><p>You can perform the test without being connected to a physical
|
|
line or network.</p>
|
|
<p>i5/OS™ reserves the IP address 127.0.0.1,
|
|
the host name LOOPBACK, and the line description value of *LOOPBACK for verifying
|
|
the software. Similarly for IPv6, i5/OS reserves the IP address ::1 and the
|
|
line description <span>*LOOPBACK</span> for this purpose. The IPv6
|
|
loopback interface does not have a corresponding host name because the local
|
|
host tables do not currently support IPv6 addresses. However, you can use
|
|
a Domain Name System (DNS) to store the IPv6 host name instead of using the
|
|
local host table.</p>
|
|
<p>To ping the loopback interface on your server to troubleshoot
|
|
the problem, follow these steps:</p>
|
|
</div>
|
|
<ol><li class="stepexpand"><span>At the command line, type these commands:</span><ul><li>For IPv4: <samp class="codeph">PING '127.0.0.1'</samp> or <samp class="codeph">PING LOOPBACK</samp></li>
|
|
<li>For IPv6: <samp class="codeph">PING '::1'</samp></li>
|
|
</ul>
|
|
See Ping parameters to fine-tune the Ping command to get the most accurate
|
|
results. Prompt on the Ping command by selecting F4 for complete details on
|
|
the Ping parameters.</li>
|
|
<li class="stepexpand"><span>Failures might indicate the following problems.</span>
|
|
<table border="1" frame="hsides" rules="rows" cellpadding="4" cellspacing="0" summary="" class="choicetableborder">
|
|
<thead><tr><th valign="bottom" align="left" id="d0e51-option">Problem</th>
|
|
<th valign="bottom" align="left" id="d0e51-desc">Recovery</th></tr></thead>
|
|
<tbody><tr><td valign="top" headers="d0e51-option" id="d0e58"><strong>The local host table does not have an entry for the IPv4
|
|
LOOPBACK host name and IP address of 127.0.0.1.</strong></td>
|
|
<td valign="top" headers="d0e51-desc d0e58"><p>You need
|
|
to add the entry to the host table. This is only relevant for IPv4 because
|
|
host tables do not currently support IPv6. To verify the host table entries,
|
|
follow these steps:</p>
|
|
<ol type="a"><li>At the command line, type <samp class="codeph">CFGTCP</samp> (Configure TCP/IP).</li>
|
|
<li>Select option 10 (Work with TCP/IP Host Table Entries).</li>
|
|
<li>Verify that the host table contains an entry for the LOOPBACK host name
|
|
and IP address 127.0.0.1.</li>
|
|
</ol>
|
|
</td>
|
|
</tr>
|
|
<tr><td valign="top" headers="d0e51-option" id="d0e74"><strong>The loopback interface is not active.</strong></td>
|
|
<td valign="top" headers="d0e51-desc d0e74"><p>To
|
|
activate the loopback interface: </p>
|
|
<ol type="a"><li>At the command line, type <samp class="codeph">NETSTAT</samp>.</li>
|
|
<li>Select option 1 (Work with TCP/IP interface status) for IPv4 interfaces,
|
|
or select option 4 (Work with IPv6 interface status) for IPv6 interfaces.</li>
|
|
<li>Scroll down to find the loopback interface (127.0.0.1 or ::1), and select
|
|
option 9 (Start) from the Work with TCP/IP interface status menu.</li>
|
|
</ol>
|
|
</td>
|
|
</tr>
|
|
<tr><td valign="top" headers="d0e51-option" id="d0e90"><strong>TCP/IP has not been started.</strong></td>
|
|
<td valign="top" headers="d0e51-desc d0e90">To start TCP/IP,
|
|
type <samp class="codeph">STRTCP</samp> (Start TCP/IP) at the command line.</td>
|
|
</tr>
|
|
</tbody></table>
|
|
</li>
|
|
</ol>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakupingcharbased.htm" title="You can use the PING command from the character-based interface to test your TCP/IP connectivity.">Ping from a character-based interface</a></div>
|
|
</div>
|
|
<div class="relref"><strong>Related reference</strong><br />
|
|
<div><a href="rzakupingerrors.htm" title="Use these common error messages to find out how to resolve the errors.">Common error messages</a></div>
|
|
<div><a href="rzakupingparam.htm" title="Ping parameters enable you to adjust the way the Ping command performs its test of connectivity.">Ping parameters</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |