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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Is your central DHCP server windows as well? If so you can
migrate the Scope, I’ve done it many times, shut down current dhcp server,
export to file, copy file to new server, import and activate it and update ip
helper, can be done in 5 to 10 minutes. all current leases and all other
settings related to the scope come over. You can do it scope by scope or the
whole server at the same time.<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>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>Matthew Loraditch</span></b><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:black'><br>
1965 Greenspring Drive<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>Timonium, MD 21093 <br>
<a href="mailto:support@heliontechnologies.com"><span style='color:black'>support@heliontechnologies.com</span></a><br>
(p) (410) 252-8830<br>
(F) (443) 541-1593<br>
<br>
Visit us at <a href="http://www.heliontechnologies.com"><span style='color:
black'>www.heliontechnologies.com</span></a> <br>
Support Issue? Email <a href="mailto:support@heliontechnologies.com"><span
style='color:black'>support@heliontechnologies.com</span></a> for fast assistance!</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<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, September 17, 2009 5:23 PM<br>
<b>To:</b> Jason Fuermann<br>
<b>Cc:</b> cisco-voip voyp list<br>
<b>Subject:</b> Re: [cisco-voip] DHCP Migration Strategy - RFC<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>Good catch - I'll see if the
new server can do a ping or something first, and what ACLs we have to open to
allow that.<br>
<br>
---<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>
"Bad grammar makes me [sic]" - Tshirt<br>
<br>
<br>
----- Original Message -----<br>
From: "Jason Fuermann" <JBF005@shsu.edu><br>
To: "Wes Sisk" <wsisk@cisco.com>, "Lelio Fulgenzi"
<lelio@uoguelph.ca><br>
Cc: "cisco-voip voyp list" <cisco-voip@puck.nether.net><br>
Sent: Thursday, September 17, 2009 5:18:35 PM GMT -05:00 US/Canada Eastern<br>
Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC<o:p></o:p></span></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If I
remember correctly we’ve had leases set to 30 minutes before without any
issues. I wouldn’t go below that because the phone is going to be renewing at a
15 minute interval. I’d check on what DHCP server you’re using, some will check
if an address is in use before issuing one (at least I’ve experienced that on
windows DHCP), and on that same note, make sure there is enough overlap in the
scopes so you don’t run out of leases due to addresses being blocked for
conflicts.</span><span style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><span
style='color:black'><o:p></o:p></span></p>
<div>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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>Wes Sisk<br>
<b>Sent:</b> Thursday, September 17, 2009 4:03 PM<br>
<b>To:</b> Lelio Fulgenzi<br>
<b>Cc:</b> cisco-voip voyp list<br>
<b>Subject:</b> Re: [cisco-voip] DHCP Migration Strategy - RFC</span><span
style='color:black'><o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:black'> <o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><span
style='color:black'>depending on your nw topology this could still be a
problem:<br>
CSCso60222 After DHCP Monitor service is stopped, IP is given
to DHCP clients <br>
<br>
make sure DHCP DISCOVER (and renew as a subset of DISC) will not reach the CM
server.<br>
<br>
Phones tend to go haywire when lease duration goes below something like 5
minutes so I would stay very clear of that on the order of 1 hour. I
don't have the bug for that handy.<br>
<br>
/Wes<br>
<br>
On Thursday, September 17, 2009 4:51:28 PM, Lelio Fulgenzi <a
href="mailto:lelio@uoguelph.ca" target="_blank"><lelio@uoguelph.ca></a>
wrote:<o:p></o:p></span></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>So, I'm
planning on moving the DHCP service off a CallManager subscriber to our central
DHCP service. Past experience tells me that this shouldn't be too much of an
issue, but there are some things to look out for. For example, IP address
conflicts on phones causes both phones to reset.<br>
<br>
Here's what I'm planning on doing (testing out on one scope to begin with):</span><span
style='color:black'><o:p></o:p></span></p>
<ol start=1 type=1>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Lower lease time on CallManager subscriber DHCP
server from 8 days to 1 hour. Wait until all phones have a 1 hour lease.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Change IP helper address on interface to new DHCP
server.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Deactivate scope on CallManager subscriber DHCP
server.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Wait one hour until all phones have new lease on
new DHCP server and all IP address conflicts are resolved.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Remotely reset phones that are not co-operating.<o:p></o:p></span></li>
</ol>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>Two
questions:</span><span style='color:black'><o:p></o:p></span></p>
<ul type=disc>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l0 level1 lfo2'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Is having a 1 hour lease time on the subscriber an
issue? It's a 7835 from about 4 years ago and it does nothing else other
than DHCP/TFTP.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l0 level1 lfo2'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Can I go a step further and lower the lease time
to 30min or even 15 min without significant concern?<o:p></o:p></span></li>
</ul>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>We have
about 7500 phones.<br>
---<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>
"Bad grammar makes me [sic]" - Tshirt</span><span style='color:black'><o:p></o:p></span></p>
</div>
<pre><span style='color:black'> <o:p></o:p></span></pre><pre
style='text-align:center'><span style='color:black'>
<hr size=4 width="90%" align=center>
</span></pre><pre style='text-align:center'><span style='color:black'><o:p> </o:p></span></pre><pre
style='text-align:center'><span style='color:black'><o:p> </o:p></span></pre><pre><span
style='color:black'> <o:p></o:p></span></pre><pre><span style='color:black'>_______________________________________________<o:p></o:p></span></pre><pre><span
style='color:black'>cisco-voip mailing list<o:p></o:p></span></pre><pre><span
style='color:black'><a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><o:p></o:p></span></pre><pre><span
style='color:black'><a
href="https://puck.nether.net/mailman/listinfo/cisco-voip" target="_blank">https://puck.nether.net/mailman/listinfo/cisco-voip</a><o:p></o:p></span></pre><pre><span
style='color:black'> <o:p></o:p></span></pre>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:black'> <o:p></o:p></span></p>
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