[99404] in North American Network Operators' Group

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Re: Question on Loosely Synchronized Router Clocks

daemon@ATHENA.MIT.EDU (James R. Cutler)
Thu Sep 20 15:19:15 2007

Date: Thu, 20 Sep 2007 15:18:15 -0400
To: "NANOG" <nanog@merit.edu>
From: "James R. Cutler" <james.cutler@consultant.com>
In-Reply-To: <46F112A1.7070405@iglou.com>
Errors-To: owner-nanog@merit.edu


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Kerberos does not assume clock synchronization.
Kerberos requires reasonable clock synchronization.
And, as near as I can tell, clock synchronization is not part of the 
Kerberos protocol.

Kick me if I err in this.

         Cutler

At 9/19/2007 08:14 AM -0400, Jeff McAdams wrote:
Stephen Sprunk wrote:
 >> ... is it reasonable to assume clock synchronization in the rest
 >> of our design?

 > In general, it is not.  I can't think of any existing protocol that
 > does, actually.

Kerberos.
-- 
Jeff McAdams
"They that can give up essential liberty to obtain a
little temporary safety deserve neither liberty nor safety."
                                        -- Benjamin Franklin




-
James R. Cutler
james.cutler@consultant.com

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<font size=3>Kerberos does not assume clock synchronization.<br>
Kerberos requires reasonable clock synchronization.<br>
And, as near as I can tell, clock synchronization is not part of the
Kerberos protocol.<br><br>
Kick me if I err in this.<br><br>
<x-tab>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</x-tab>Cutler<br>
<br>
At 9/19/2007 08:14 AM -0400, Jeff McAdams wrote:<br>
Stephen Sprunk wrote:<br>
&gt;&gt; ... is it reasonable to assume clock synchronization in the
rest<br>
&gt;&gt; of our design?<br><br>
&gt; In general, it is not.&nbsp; I can't think of any existing protocol
that<br>
&gt; does, actually.<br><br>
Kerberos.<br>
-- <br>
Jeff McAdams<br>
&quot;They that can give up essential liberty to obtain a<br>
little temporary safety deserve neither liberty nor safety.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
-- Benjamin Franklin<br><br>
<br><br>
</font><x-sigsep><p></x-sigsep>
<font face="Courier, Courier" size=3>-<br>
James R. Cutler<br>
james.cutler@consultant.com<br>
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