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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">3.2</font></b></td>
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<td bgcolor="#336666" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">PPP Authentication</font></strong></td>
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<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">3.2.4</font></b></td>
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<font size="2" color="#FFFFFF"><b><span style="font-family: Arial">Password
Authentication Protocol (PAP)</span></b></font></td>
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<font face="Arial" size="2">PAP provides a simple method for a remote
node to establish its identity, using a two-way handshake.
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> After the
PPP link establishment phase is complete, a username/password pair is
repeatedly sent by the remote node across the link until
authentication is acknowledged or the connection is terminated.
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font><p>
<font face="Arial" size="2">PAP is not a strong authentication
protocol. Passwords are sent across the link in clear text and there
is no protection from playback or repeated trial-and-error attacks.
The remote node is in control of the frequency and timing of the login
attempts.</font></p>
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<p>Configuring and Troubleshooting PPP Password Authentication Protocol (PAP)<p>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a0080093c6f.shtml">
http://www.cisco.com/en/US/tech/tk713/</a><br>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a0080093c6f.shtml">
tk507/technologies_tech_note09186a</a><br>
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0080093c6f.shtml</a></font></p>
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