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<title>Change IPv4 Interface (QTOCCHGIF) API</title>
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<h2><img src="delta.gif" alt="Start of change">Change IPv4 Interface (QTOCC4IF) API</h2>
<div class="box" style="width: 90%;">
<br>
&nbsp;Required Parameter Group:<br>
<br>
<br>
<table width="100%">
<tr>
<td align="center" valign="top">1</td>
<td align="left" valign="top">Interface information</td>
<td align="left" valign="top">Input</td>
<td align="left" valign="top">Char(*)</td>
</tr>
<tr>
<td align="center" valign="top" width="10%">2</td>
<td align="left" valign="top" width="50%">Format name</td>
<td align="left" valign="top" width="20%">Input</td>
<td align="left" valign="top" width="20%">Char(8)</td>
</tr>
<tr>
<td align="center" valign="top">3</td>
<td align="left" valign="top">Error code</td>
<td align="left" valign="top">I/O</td>
<td align="left" valign="top">Char(*)</td>
</tr>
</table>
<br>
&nbsp;&nbsp;Default Public Authority: *USE<br>
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&nbsp;&nbsp;Threadsafe: Yes<br>
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<p>The Change IPv4 Interface (QTOCC4IF) API is used to change selected parameters
for an IPv4 interface that is defined in the system's TCP/IP configuration.</p>
<br>
<h3>Authorities and Locks</h3>
<dl>
<dt><em>Special Authority</em></dt>
<dd>The caller of this API must be running under a user profile that has input/output system configuration (*IOSYSCFG) special authority.
</dd>
</dl>
<br>
<h3>Required Parameter Group</h3>
<dl>
<dt><strong>Interface Information</strong></dt>
<dd>INPUT; CHAR(*)
<p>Contains the characteristics of the IPv4 interface being changed.</p>
</dd>
<dt><strong>Format name</strong></dt>
<dd>INPUT; CHAR(8)
<p>The format of the interface information parameter. The format name supported is:</p>
<dl>
<dt><em>IFCH0100</em></dt>
<dd>Format for adding or changing an IPv4 interface parameter. For the format of the structure,
see <a href="#InterfaceDefinition">IFCH0100 Format</a>.</dd>
</dl>
</dd>
<dt><strong>Error code</strong></dt>
<dd>I/O; CHAR(*)
<p>The structure in which to return error information. For the format of the structure refer to <a href="../apiref/error.htm#hdrerrcod">Error Code Parameter</a>.</p>
</dd>
</dl>
<br>
<h3><a name="InterfaceDefinition">IFCH0100 Format</a></h3>
For detailed descriptions of the fields in this table, see <a href="#Header_8"> Field Descriptions</a>.
<table border width="80%">
<tr>
<th align="center" valign="bottom" colspan="2">Offset</th>
<th align="left" valign="bottom" rowspan="2">Type</th>
<th align="left" valign="bottom" rowspan="2">Field</th>
</tr>
<tr>
<th align="left" valign="bottom">Dec</th>
<th align="left" valign="bottom">Hex</th>
</tr>
<tr>
<td align="center" valign="top" width="10%">0</td>
<td align="center" valign="top" width="10%">0</td>
<td align="left" valign="top" width="20%">BINARY(4)</td>
<td align="left" valign="top" width="60%">Length of fixed interface information</td>
</tr>
<tr>
<td align="center" valign="top">4</td>
<td align="center" valign="top">4</td>
<td align="left" valign="top">CHAR(15)</td>
<td align="left" valign="top">Internet address</td>
</tr>
<tr>
<td align="center" valign="top">19</td>
<td align="center" valign="top">13</td>
<td align="left" valign="top">CHAR(1)</td>
<td align="left" valign="top">Reserved</td>
</tr>
<tr>
<td align="center" valign="top">20</td>
<td align="center" valign="top">14</td>
<td align="left" valign="top">BINARY(4)</td>
<td align="left" valign="top">Proxy ARP allowed</td>
</tr>
<tr>
<td align="center" valign="top">24</td>
<td align="center" valign="top">18</td>
<td align="left" valign="top">BINARY(4)</td>
<td align="left" valign="top">Offset to preferred interface list</td>
</tr>
<tr>
<td align="center" valign="top">28</td>
<td align="center" valign="top">1C</td>
<td align="left" valign="top">BINARY(4)</td>
<td align="left" valign="top">Number of entries in preferred interface list</td>
</tr>
<tr>
<td align="center" valign="top">32</td>
<td align="center" valign="top">20</td>
<td align="left" valign="top">BINARY(4)</td>
<td align="left" valign="top">Length of one preferred interface list entry</td>
</tr>
<tr>
<td align="center" valign="top">36</td>
<td align="center" valign="top">24</td>
<td align="left" valign="top">CHAR(24)</td>
<td align="left" valign="top">Interface name</td>
</tr>
<tr>
<td align="left" valign="top" colspan=2>This field repeats for each preferred interface list entry</td>
<td align="left" valign="top">CHAR(*)</td>
<td align="left" valign="top">Preferred interface list entry (See Format of Preferred
Interface List Entry for more information.) </td>
</tr>
</table>
<br>
<br>
<h3><a name="Header_7">Format of Preferred Interface List Entry</a></h3>
<P>The preferred interface list entry describes the data specified for each
entry in the preferred interface list of the IFCH0100 format.
For detailed descriptions of the fields in the table, see Field Descriptions.</P>
<table border width="80%">
<tr>
<th align="center" valign="bottom" colspan="2">Offset</th>
<th align="left" valign="bottom" rowspan="2">Type</th>
<th align="left" valign="bottom" rowspan="2">Field</th>
</tr>
<tr>
<th align="left" valign="bottom">Dec</th>
<th align="left" valign="bottom">Hex</th>
</tr>
<tr>
<td align="center" valign="top">0</td>
<td align="center" valign="top">0</td>
<td align="left" valign="top">CHAR(15)</td>
<td align="left" valign="top">Preferred interface internet address</td>
</tr>
<tr>
<td align="center" valign="top">15</td>
<td align="center" valign="top">0F</td>
<td align="left" valign="top">CHAR(1)</td>
<td align="left" valign="top">Reserved</td>
</tr>
</table>
<br><br>
<h3><a name="Header_8">Field Descriptions</a></h3>
<p><strong>Interface name.</strong> Specifies a textual description of this interface.
Up to 24 characters, padded with blanks, may be specified. A value of *SAME means
that the interface name does not change.</p>
<p><strong>Internet address.</strong> The IPv4 internet address, in dotted decimal
notation, of an interface.</p>
<p><strong>Length of fixed interface information.</strong> This field contains
the number of bytes specified in the fixed portion of the interface information
structure. The minimum value for this field is 24.</p>
<P><strong>Length of one preferred interface list entry.</strong> The length
of a preferred interface list entry. A value of zero means that the list will be removed.
A value greater than zero means that the list will be replaced. A value of -1 means that
the list does not change.</p>
<P><strong>Number of entries in preferred interface list</strong> The number of
entries in the preferred interface list. A value of zero means that the list will be
removed. A value greater than zero means that the list will be replaced. A value of -1
means that the list does not change. The maximum value for this field is 10.</p>
<p><strong>Offset to preferred interface list</strong> The offset from the start
of the fixed interface information to the beginning of the preferred interface list.
A value of zero or greater means that the list will be replaced. A value of -1 means
that the list does not change.</p>
<p><strong>Preferred interface internet address</strong> The internet address, in
dotted decimal notation, of an interface in the preferred interface list.</p>
<p><strong>Preferred interface list entry.</strong> Specifies information about
an interface in the preferred interface list. The order
in which the list entries are specified is also the order in which the
system uses the interfaces as Proxy Agents.</p>
<p><strong>Proxy ARP allowed.</strong> This field applies to Opticonnect (*OPC)
and Virtual Ethernet interfaces only. For those types of interfaces, this field
indicates whether Proxy (Address Resolution Protocol) ARP has been configured
to be allowed or not allowed.</p>
<table cellpadding="5">
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<tr>
<td align="left" valign="top"><em>0</em></td>
<td align="left" valign="top">NO - Proxy ARP not allowed.</td>
</tr>
<tr>
<td align="left" valign="top"><em>1</em></td>
<td align="left" valign="top">YES - Proxy ARP allowed.</td>
</tr>
<tr>
<td align="left" valign="top"><em>-1</em></td>
<td align="left" valign="top">The value does not change.</td>
</tr>
</table>
<p><strong>Reserved.</strong> A reserved field. This field must be set to zero.</p>
<br>
<h3>Usage Notes</h3>
<p>Typically, if an error is detected during the change operation, a diagnostic message
will be sent to the job log. This diagnostic message will contain details about the
error. The API will then either signal the error message TCP2658 or return
TCP2658 in the error code structure.</p>
<br>
<h3>Error Messages</h3>
<table width="100%">
<tr>
<th align="left" valign="top">Message ID</th>
<th align="left" valign="top">Error Message Text</th>
</tr>
<tr>
<td valign="top">CPF3CF1 E</td>
<td valign="top">Error code parameter not valid.</td>
</tr>
<tr>
<td valign="top">CPF3CF2 E</td>
<td valign="top">Error(s) occurred during running of &amp;1 API.</td>
</tr>
<tr>
<td valign="top">CPF9872 E</td>
<td valign="top">Program or service program &amp;1 in library &amp;2 ended.
Reason code &amp;3.</td>
</tr>
<tr>
<td valign="top">TCP2658 E</td>
<td valign="top">&amp;2 &amp;1 not changed.</td>
</tr>
<tr>
<td valign="top">TCP923C E</td>
<td valign="top">&amp;1 special authority is required.</td>
</tr>
<tr>
<td valign="top">TCP923F E</td>
<td valign="top">Value for parameter &amp;2 for API &amp;1 not valid.</td>
</tr>
</table>
<br>
<img src="deltaend.gif" alt="End of change">
<hr>
API introduced: V5R4
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