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<html>
<head>
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<title>Content</title>
<base target="_self">
</head>
<body background="../../images/bg.gif" topmargin="0" leftmargin="0" marginheight="0" marginwidth="0" onLoad="window.focus();" link="#808080" vlink="#808080" alink="#808080">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td bgcolor="#336666" width="18" valign="top">
<img border="0" src="../../images/content_lines.gif" width="16" height="25">
<img border="0" src="../../images/transdot.gif" width="2" height="1"></td>
<td bgcolor="#336666"><font face="Arial" size="2" color="#FFFFFF"><b>1.1</b></font></td>
<td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
<td bgcolor="#336666" width="100%"><b>
<font face="Arial" size="2" color="#FFFFFF">Scaling Networks with NAT and
PAT</font></b></td>
<td width="9" bgcolor="#336666"> </td>
</tr>
<tr>
<td bgcolor="#669999" height="25" width="18"> </td>
<td bgcolor="#669999" height="25"><b><font face="Arial" size="2" color="#FFFFFF">
1.1.4</font></b></td>
<td bgcolor="#669999"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
<td bgcolor="#669999" height="25" width="100%"><b>
<font face="Arial" size="2" color="#FFFFFF">Configuring NAT and PAT</font></b></td>
<td bgcolor="#669999" height="25" width="9"> </td>
</tr></table>
<table border="0" cellpadding="0" cellspacing="0" width="95%" bordercolor="#111111">
<tr>
<td width="15"></td>
<td>
<font FACE="Arial" SIZE="2" COLOR="#000000"><b>Static Translation</b><br>
To configure static inside source address translation, perform the
tasks in Figures
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> and
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12">.</font><p>
<font FACE="Arial" SIZE="2" COLOR="#000000">Figure
<img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"> shows the
use of static NAT translation. The router will translate packets from
host 10.1.1.2 to a source address of 192.168.1.2.</font></p>
<p>
<font FACE="Arial" SIZE="2" COLOR="#000000"><b>Dynamic Translation</b><br>
To configure dynamic inside source address translation, perform the
tasks in Figure
<img border="0" src="../../images/4.gif" align="absmiddle" width="12" height="12">.</font></p>
<p>
<font FACE="Arial" SIZE="2" COLOR="#000000">The access list must
permit only those addresses that are to be translated. Remember that
there is an implicit �deny all� at the end of each access list. An
access list that is too permissive can lead to unpredictable results.
Cisco advises against configuring access lists referenced by NAT
commands with the </font>
<font FACE="Courier New" SIZE="2" COLOR="#000000"><b>permit any</b></font><font FACE="Arial" SIZE="2" COLOR="#000000">
command. Using </font><b>
<font FACE="Courier New" SIZE="2" COLOR="#000000">permit any</font></b><font FACE="Arial" SIZE="2" COLOR="#000000">
can result in NAT consuming too many router resources, which can cause
network problems.</font></p>
<p>
<font FACE="Arial" SIZE="2" COLOR="#000000">Figure
<img border="0" src="../../images/5.gif" align="absmiddle" width="12" height="12"> translates
all source addresses passing access list 1, which have source address
from 10.1.0.0/24, to an address from the pool named nat-pool1. The
pool contains addresses from 179.9.8.80/24 to 179.9.8.95/24.
</font>
</p>
<blockquote>
<p>
<font FACE="Arial" SIZE="2" COLOR="#000000"><b>Note:</b> NAT will not
translate the host 10.1.1.2, as it is not permitted for translation
by the access list.</font></p>
</blockquote>
<p>
<font FACE="Arial" SIZE="2" COLOR="#000000"><b>Overloading</b><br>
Overloading is configured in two ways depending on how public IP
addresses have been allocated. An ISP can allocate a network only one
public IP address, and this is typically assigned to the outside
interface which connects to the ISP. Figure
<img border="0" src="../../images/6.gif" align="absmiddle" width="12" height="12"> shows how
to configure overloading in this situation.</font></p>
<p>
<font face="Arial" size="2">Another way of configuring overload is if
the ISP has given one or more public IP addresses for use as a NAT
pool. This pool can be overloaded as shown in the configuration in
Figure </font>
<font FACE="Arial" SIZE="2" COLOR="#000000">
<img border="0" src="../../images/7.gif" align="absmiddle" width="12" height="12"></font><font face="Arial" size="2">.</font></p>
<p>
<font face="Arial" size="2">Figure </font>
<font FACE="Arial" SIZE="2" COLOR="#000000">
<img border="0" src="../../images/8.gif" align="absmiddle" width="12" height="12"></font><font face="Arial" size="2">
shows an example configuration of PAT.</font></p>
<p>
<TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
<TR>
<TD valign="top">
<TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD>
<IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">
<a target="main" href="../lab1_1_4a/index.html">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"> <b>
Lab Activity</b></a></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>Lab Exercise: Configuring NAT</p>
</font><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">In this lab, a router will be
configured to use network address translation (NAT). </font></p>
<p></TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
<TR>
<TD valign="top">
<TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD>
<IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#808080">
<a target="main" href="../lab1_1_4b/index.html">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"> <b>
Lab Activity</b></a><p>Lab Exercise: Configuring PAT</p>
<p>In this lab, a router will be configured to use Port Address
Translation (PAT). </p>
</font><font FACE="Arial" SIZE="2" COLOR="#000000">
<p></TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
<TR>
<TD valign="top">
<TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD>
<IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#808080">
<a target="main" href="../lab1_1_4c/index.html">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"> <b>
Lab Activity</b></a><p>Lab Exercise: Configuring static NAT Addresses</p>
</font><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font FACE="Arial" SIZE="2" COLOR="#808080">
In this lab,</font><font color="#808080"> a router will be
configured to use network address translation (NAT) to convert
internal IP addresses, typically private addresses, into outside
public addresses.</font></p>
<p></TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE bgcolor="#669999" width="95%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD>
<IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="95%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod01/elab_1_1_4a/elab1_1_4a.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"><b></a>
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod01/elab_1_1_4a/elab1_1_4a.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">Lab Activity</a></b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>e-Lab Activity: Configuring NAT</p>
</font><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">In this lab, the student will configure
NAT.</font></p>
<p></TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE bgcolor="#669999" width="95%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD>
<IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="95%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod01/ela_b1_1_4b/elab1_1_4b.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"><b></a>
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod01/elab_1_1_4b/elab1_1_4b.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">Lab Activity</a></b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>e-Lab Activity: Configuring PAT</p>
</font><font FACE="Arial" SIZE="2" COLOR="#000000">
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>In this lab, the students will configure a router to use Port
Address Translation (PAT) to convert internal IP addresses,
typically private addresses, into an outside public address</p>
<font FACE="Arial" SIZE="2" COLOR="#000000">
<p></TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE bgcolor="#669999" width="95%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD>
<IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="95%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod01/elab_1_1_4c/elab1_1_4c.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"><b></a>
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod01/elab_1_1_4c/elab1_1_4c.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">Lab Activity</a></b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>e-Lab Activity: Configuring Static NAT Addresses</p>
<p>In this lab, the student will configure</font><font FACE="Arial" SIZE="2" COLOR="#000000"><font color="#808080">
a router to use network address translation (NAT) to convert
internal IP addresses, typically private addresses, into outside
public addresses.</font></p>
<p></TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
<TR>
<TD valign="top">
<TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD width="5">
<img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
<TD><IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
<IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
</TR>
</TABLE>
<TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
<TR>
<TD>
<TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
<TR>
<TD bgcolor="#ffffff" width="15"> </TD>
<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">
<img border="0" src="../../images/links_icon.gif" width="25" height="25">
<b>Web Links</b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>Configuring Network Address Translation: Getting Started<p>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77.shtml">
http://www.cisco.com/en/US/tech/tk648/ tk361/technologies_tech_ note09186a0080094e77.shtml</a></font></p>
<p>
<IMG alt="" height="2" width="1" src="../../images/s.gif"></p>
</TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE>
</TD>
</TR>
</TABLE><p>
</td>
</tr>
</table>
</body>
</html>
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