<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Verdana; font-size: 10pt; color: #000000'>I tested out migrating to a new DHCP server tonite and it worked out well. I have to go through the logs in more detail to see if our server saw any conflicts, or if that even went into the logs, but we didn't have any IP addr conflicts as far as I can tell. <br><br>That being said, I had a colleague who was on the phone, and although the lease time had expired for that phone (it even dissappeared from the lease list on the server) it did not reboot until he hung up the phone. <br><br>So that was kinda nice.<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: "Wes Sisk" <wsisk@cisco.com><br>To: "Scott Voll" <svoll.voip@gmail.com><br>Cc: "Lelio Fulgenzi" <lelio@uoguelph.ca>, "cisco-voip voyp list" <cisco-voip@puck.nether.net><br>Sent: Friday, September 18, 2009 10:13:37 AM GMT -05:00 US/Canada Eastern<br>Subject: Re: [cisco-voip] DHCP Migration Strategy - RFC<br><br>
<link href="/zimbra/css/msgview.css?v=081117021119" rel="stylesheet">
that is correct, phones reboot if IP changes.<br>
<br>
most dhcp servers will not NAK a renew request. This was implemented to
facilitate redudant DHCP servers for an address scope. Since DHCP
servers will not NAK your client leases have to expire before they will
get a new address.<br>
<br>
/wes<br>
<br>
On Thursday, September 17, 2009 5:44:11 PM, Scott Voll
<a class="moz-txt-link-rfc2396E" href="mailto:svoll.voip@gmail.com" target="_blank"><svoll.voip@gmail.com></a> wrote:<br>
<blockquote cite="mid:f84a38d30909171444k7508edbds9e43fa4dbfbd2beb@mail.gmail.com">It's been a really long time ago, but has anyone had issue
with short lease times. Doesn't the phone blip every time it gets a
new IP? IF memory serves me correct I had calls cutting out when the
phones grabbed a new IP. Was that just a Firmware load I had at the
time?
<div><br>
</div>
<div>Scott<br>
<br>
<div class="gmail_quote">On Thu, Sep 17, 2009 at 2:39 PM, Lelio
Fulgenzi <span dir="ltr"><<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<div style="font-family: Verdana; font-size: 10pt; color: rgb(0, 0, 0);">sweet!
thanks.
<div class="im"><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: "Matthew Loraditch" <<a href="mailto:MLoraditch@heliontechnologies.com" target="_blank">MLoraditch@heliontechnologies.com</a>><br>
To: "Lelio Fulgenzi" <<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>><br>
</div>
<div>
<div class="h5">Cc: "cisco-voip voyp list" <<a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a>>, "Jason Fuermann"
<<a href="mailto:JBF005@shsu.edu" target="_blank">JBF005@shsu.edu</a>><br>
Sent: Thursday, September 17, 2009 5:36:34 PM GMT -05:00 US/Canada
Eastern<br>
Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC<br>
<br>
<div>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">Go
Google: <a href="http://www.infoblox.com/import/" target="_blank">http://www.infoblox.com/import/</a></span></p>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">I just
look at the parts of the wizard I could get to w/o an
infoblox and it says you can, albeit looks like you have to do the
whole server
from the included instructions not sure if that would mess you up or not</span></p>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div>
<p><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p><b><span style="font-size: 11pt; color: black;">Matthew Loraditch</span></b><span style="font-size: 11pt; color: black;"><br>
1965 Greenspring Drive</span></p>
<p><span style="font-size: 11pt; color: black;">Timonium, MD 21093 <br>
<a href="mailto:support@heliontechnologies.com" target="_blank"><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" target="_blank"><span style="color: black;">www.heliontechnologies.com</span></a> <br>
Support Issue? Email <a href="mailto:support@heliontechnologies.com" target="_blank"><span style="color: black;">support@heliontechnologies.com</span></a> for
fast assistance!</span><span style="font-size: 11pt; color: rgb(31, 73, 125);"></span></p>
</div>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div>
<div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> Lelio Fulgenzi
[mailto:<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>] <br>
<b>Sent:</b> Thursday, September 17, 2009 5:32 PM<br>
<b>To:</b> Matthew Loraditch<br>
<b>Cc:</b> cisco-voip voyp list; Jason Fuermann<br>
<b>Subject:</b> Re: [cisco-voip] DHCP Migration Strategy - RFC</span></p>
</div>
</div>
<p> </p>
<div>
<p style="margin-bottom: 12pt;"><span style="font-size: 10pt; color: black;">Central DHCP server is
InfoBlox. I'll have to see if they can import a Windows DHCP export
file.<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: "Matthew Loraditch" <<a href="mailto:MLoraditch@heliontechnologies.com" target="_blank">MLoraditch@heliontechnologies.com</a>><br>
To: "Lelio Fulgenzi" <<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>>,
"Jason
Fuermann" <<a href="mailto:JBF005@shsu.edu" target="_blank">JBF005@shsu.edu</a>><br>
Cc: "cisco-voip voyp list" <<a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a>><br>
Sent: Thursday, September 17, 2009 5:27:51 PM GMT -05:00 US/Canada
Eastern<br>
Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC</span></p>
<div>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">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.</span><span style="color: black;"></span></p>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span><span style="color: black;"></span></p>
<div>
<p><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span><span style="color: black;"></span></p>
<p><b><span style="font-size: 11pt; color: black;">Matthew
Loraditch</span></b><span style="font-size: 11pt; color: black;"><br>
1965 Greenspring Drive</span><span style="color: black;"></span></p>
<p><span style="font-size: 11pt; color: black;">Timonium,
MD 21093 <br>
<a href="mailto:support@heliontechnologies.com" target="_blank"><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" target="_blank"><span style="color: black;">www.heliontechnologies.com</span></a> <br>
Support Issue? Email <a href="mailto:support@heliontechnologies.com" target="_blank"><span style="color: black;">support@heliontechnologies.com</span></a>
for fast assistance!</span><span style="color: black;"></span></p>
</div>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span><span style="color: black;"></span></p>
<div>
<div style="border-style: solid none none; border-color: -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p><b><span style="font-size: 10pt; color: black;">From:</span></b><span style="font-size: 10pt; color: black;">
<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>
[mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>]
<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</span><span style="color: black;"></span></p>
</div>
</div>
<p><span style="color: black;"> </span></p>
<div>
<p style="margin-bottom: 12pt;"><span style="font-size: 10pt; 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" <<a href="mailto:JBF005@shsu.edu" target="_blank">JBF005@shsu.edu</a>><br>
To: "Wes Sisk" <<a href="mailto:wsisk@cisco.com" target="_blank">wsisk@cisco.com</a>>,
"Lelio Fulgenzi"
<<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>><br>
Cc: "cisco-voip voyp list" <<a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a>><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</span><span style="color: black;"></span></p>
<div>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">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;"></span></p>
<p><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span><span style="color: black;"></span></p>
<div>
<div style="border-style: solid none none; border-color: -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p><b><span style="font-size: 10pt; color: black;">From:</span></b><span style="font-size: 10pt; color: black;">
<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>
[mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>]
<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;"></span></p>
</div>
</div>
<p><span style="color: black;"> </span></p>
<p style="margin-bottom: 12pt;"><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:</span></p>
<div>
<p><span style="font-size: 10pt; 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;"></span></p>
<ol start="1" type="1">
<li style="color: black;"><span style="font-size: 10pt;">Lower
lease time on CallManager subscriber DHCP server from 8 days to 1 hour.
Wait until all phones have a 1 hour lease.</span></li>
<li style="color: black;"><span style="font-size: 10pt;">Change
IP helper address on interface to new DHCP server.</span></li>
<li style="color: black;"><span style="font-size: 10pt;">Deactivate
scope on CallManager subscriber DHCP server.</span></li>
<li style="color: black;"><span style="font-size: 10pt;">Wait one
hour until all phones have new lease on new DHCP server and all IP
address conflicts are resolved.</span></li>
<li style="color: black;"><span style="font-size: 10pt;">Remotely
reset phones that are not co-operating.</span></li>
</ol>
<p><span style="font-size: 10pt; color: black;">Two
questions:</span><span style="color: black;"></span></p>
<ul type="disc">
<li style="color: black;"><span style="font-size: 10pt;">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.</span></li>
<li style="color: black;"><span style="font-size: 10pt;">Can I go
a step further and lower the lease time to 30min or even 15 min without
significant concern?</span></li>
</ul>
<p style="margin-bottom: 12pt;"><span style="font-size: 10pt; 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;"></span></p>
</div>
<pre><span style="color: black;"> </span></pre>
<pre style="text-align: center;"><span style="color: black;"> </span></pre>
<pre style="text-align: center;"><span style="color: black;"> </span></pre>
<pre style="text-align: center;"><span style="color: black;">
<hr size="4" width="90%" align="center">
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<pre style="text-align: center;"><span style="color: black;"> </span></pre>
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<pre style="text-align: center;"><span style="color: black;"> </span></pre>
<pre style="text-align: center;"><span style="color: black;"> </span></pre>
<pre><span style="color: black;"> </span></pre>
<pre><span style="color: black;">_______________________________________________</span></pre>
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<pre><span style="color: black;"> </span></pre>
<p><span style="color: black;"> </span></p>
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