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<DIV><FONT size=2>I would set the lease time to about 2 minutes for a migration
like this.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Typically, lease renewals happen 1/2 way through the lease
time.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>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.</FONT></DIV>
<DIV> </DIV>
<DIV>--------------------------------------------------------------------------------<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<BR></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=ealeatherman@gmail.com href="mailto:ealeatherman@gmail.com">Ed
Leatherman</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=cisco-voip@puck.nether.net
href="mailto:cisco-voip@puck.nether.net">ciscovoip</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, June 07, 2007 9:31
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [cisco-voip] DHCP Behavior</DIV>
<DIV><BR></DIV>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
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