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<DIV><FONT size=2>But the phone has the IP address of the DHCP server - so it
will try to communicate directly. <FONT size=2>Unless the scope or server is
stopped.</FONT></FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Ok, maybe two minutes is a bit harsh, 5 minutes should be ok.
we did this on a network of about 7500 and it was not a problem over the 5 days
in order to let them old leases expire.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>As they get to the new lease from the new DHCP server they get
the longer lease.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2></FONT> </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>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Matt.Slaga@us.didata.com href="mailto:Matt.Slaga@us.didata.com">Matt
Slaga (US)</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=lelio@uoguelph.ca
href="mailto:lelio@uoguelph.ca">Lelio Fulgenzi</A> ; <A
title=ealeatherman@gmail.com href="mailto:ealeatherman@gmail.com">Ed
Leatherman</A> ; <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 9:39
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [cisco-voip] DHCP
Behavior</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> <A
href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</A>
[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></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">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: 10pt">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: 10pt">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-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0in; MARGIN: 5pt 0in 5pt 3.75pt; BORDER-LEFT: black 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; 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: 10pt; FONT-FAMILY: 'Arial','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> <A
title=ealeatherman@gmail.com href="mailto:ealeatherman@gmail.com">Ed
Leatherman</A> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">To:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> <A
title=cisco-voip@puck.nether.net
href="mailto:cisco-voip@puck.nether.net">ciscovoip</A>
<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Sent:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Subject:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center>
<HR align=center width="100%" SIZE=2>
</DIV>
<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></BLOCKQUOTE></DIV>
<P>
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