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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you are not changing IP networks, then you can leave them the
way they are and let them change DHCP servers on their own. If you set it to 1
minute, every phone will be requesting a new address every 30 seconds which
would have a negative impact on users.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Let them migrate on their own over a few days. The phones don’t
care what the dhcp server is, as long as one responds.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On
Behalf Of </b>Lelio Fulgenzi<br>
<b>Sent:</b> Thursday, June 07, 2007 9:35 AM<br>
<b>To:</b> Ed Leatherman; ciscovoip<br>
<b>Subject:</b> Re: [cisco-voip] DHCP Behavior<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt'>I would set the lease time to
about 2 minutes for a migration like this.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt'>Typically, lease renewals
happen 1/2 way through the lease time.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt'>The new DHCP server should
ping the address before it assigns it, but you might get IP address conflicts.
In that case, the phone reboots and tries to get a new address.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>--------------------------------------------------------------------------------<br>
Lelio Fulgenzi, B.A.<br>
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <br>
"Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo
buffalo." WJR<o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>-----
Original Message ----- <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal style='background:#E4E4E4'><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'> <a href="mailto:ealeatherman@gmail.com"
title="ealeatherman@gmail.com">Ed Leatherman</a> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>To:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <a
href="mailto:cisco-voip@puck.nether.net" title="cisco-voip@puck.nether.net">ciscovoip</a>
<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Sent:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> Thursday, June 07,
2007 9:31 AM<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Subject:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> [cisco-voip] DHCP
Behavior<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<p class=MsoNormal>I'm getting ready to start migrating ip phones off of the
DHCP service on our callmanager to a DHCP appliance (infoblox). I've got the
lease timer down to 1 hour now on my first set of phones, my next step is going
to be to change the ip helper-address on the routers and deactivate the scope
in DHCP on the windows box. <br>
<br>
How do the phones behave when they try to renew and their original DHCP server
isnt there? Do i need to reset all of them, or will they find the new server on
their own? <br clear=all>
<br>
-- <br>
Ed Leatherman<br>
Senior Voice Engineer<br>
West Virginia University<br>
Telecommunications and Network Operations <o:p></o:p></p>
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<p class=MsoNormal>_______________________________________________<br>
cisco-voip mailing list<br>
cisco-voip@puck.nether.net<br>
https://puck.nether.net/mailman/listinfo/cisco-voip<o:p></o:p></p>
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