[cisco-voip] DHCP Migration Strategy - RFC
Wes Sisk
wsisk at cisco.com
Fri Sep 18 10:13:37 EDT 2009
that is correct, phones reboot if IP changes.
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.
/wes
On Thursday, September 17, 2009 5:44:11 PM, Scott Voll
<svoll.voip at gmail.com> wrote:
> 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?
>
> Scott
>
> On Thu, Sep 17, 2009 at 2:39 PM, Lelio Fulgenzi <lelio at uoguelph.ca
> <mailto:lelio at uoguelph.ca>> wrote:
>
> sweet! thanks.
>
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Bad grammar makes me [sic]" - Tshirt
>
>
> ----- Original Message -----
> From: "Matthew Loraditch" <MLoraditch at heliontechnologies.com
> <mailto:MLoraditch at heliontechnologies.com>>
> To: "Lelio Fulgenzi" <lelio at uoguelph.ca <mailto:lelio at uoguelph.ca>>
> Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net
> <mailto:cisco-voip at puck.nether.net>>, "Jason Fuermann"
> <JBF005 at shsu.edu <mailto:JBF005 at shsu.edu>>
> Sent: Thursday, September 17, 2009 5:36:34 PM GMT -05:00 US/Canada
> Eastern
> Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC
>
> Go Google: http://www.infoblox.com/import/
>
> 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
>
>
>
>
>
> *Matthew Loraditch*
> 1965 Greenspring Drive
>
> Timonium, MD 21093
> support at heliontechnologies.com <mailto:support at heliontechnologies.com>
> (p) (410) 252-8830
> (F) (443) 541-1593
>
> Visit us at www.heliontechnologies.com
> <http://www.heliontechnologies.com>
> Support Issue? Email support at heliontechnologies.com
> <mailto:support at heliontechnologies.com> for fast assistance!
>
>
>
> *From:* Lelio Fulgenzi [mailto:lelio at uoguelph.ca
> <mailto:lelio at uoguelph.ca>]
> *Sent:* Thursday, September 17, 2009 5:32 PM
> *To:* Matthew Loraditch
> *Cc:* cisco-voip voyp list; Jason Fuermann
> *Subject:* Re: [cisco-voip] DHCP Migration Strategy - RFC
>
>
>
> Central DHCP server is InfoBlox. I'll have to see if they can
> import a Windows DHCP export file.
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Bad grammar makes me [sic]" - Tshirt
>
>
> ----- Original Message -----
> From: "Matthew Loraditch" <MLoraditch at heliontechnologies.com
> <mailto:MLoraditch at heliontechnologies.com>>
> To: "Lelio Fulgenzi" <lelio at uoguelph.ca
> <mailto:lelio at uoguelph.ca>>, "Jason Fuermann" <JBF005 at shsu.edu
> <mailto:JBF005 at shsu.edu>>
> Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net
> <mailto:cisco-voip at puck.nether.net>>
> Sent: Thursday, September 17, 2009 5:27:51 PM GMT -05:00 US/Canada
> Eastern
> Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC
>
> 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.
>
>
>
>
>
> *Matthew Loraditch*
> 1965 Greenspring Drive
>
> Timonium, MD 21093
> support at heliontechnologies.com <mailto:support at heliontechnologies.com>
> (p) (410) 252-8830
> (F) (443) 541-1593
>
> Visit us at www.heliontechnologies.com
> <http://www.heliontechnologies.com>
> Support Issue? Email support at heliontechnologies.com
> <mailto:support at heliontechnologies.com> for fast assistance!
>
>
>
> *From:* cisco-voip-bounces at puck.nether.net
> <mailto:cisco-voip-bounces at puck.nether.net>
> [mailto:cisco-voip-bounces at puck.nether.net
> <mailto:cisco-voip-bounces at puck.nether.net>] *On Behalf Of *Lelio
> Fulgenzi
> *Sent:* Thursday, September 17, 2009 5:23 PM
> *To:* Jason Fuermann
> *Cc:* cisco-voip voyp list
> *Subject:* Re: [cisco-voip] DHCP Migration Strategy - RFC
>
>
>
> 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.
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Bad grammar makes me [sic]" - Tshirt
>
>
> ----- Original Message -----
> From: "Jason Fuermann" <JBF005 at shsu.edu <mailto:JBF005 at shsu.edu>>
> To: "Wes Sisk" <wsisk at cisco.com <mailto:wsisk at cisco.com>>, "Lelio
> Fulgenzi" <lelio at uoguelph.ca <mailto:lelio at uoguelph.ca>>
> Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net
> <mailto:cisco-voip at puck.nether.net>>
> Sent: Thursday, September 17, 2009 5:18:35 PM GMT -05:00 US/Canada
> Eastern
> Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC
>
> 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.
>
>
>
> *From:* cisco-voip-bounces at puck.nether.net
> <mailto:cisco-voip-bounces at puck.nether.net>
> [mailto:cisco-voip-bounces at puck.nether.net
> <mailto:cisco-voip-bounces at puck.nether.net>] *On Behalf Of *Wes Sisk
> *Sent:* Thursday, September 17, 2009 4:03 PM
> *To:* Lelio Fulgenzi
> *Cc:* cisco-voip voyp list
> *Subject:* Re: [cisco-voip] DHCP Migration Strategy - RFC
>
>
>
> depending on your nw topology this could still be a problem:
> CSCso60222 After DHCP Monitor service is stopped, IP is given
> to DHCP clients
>
> make sure DHCP DISCOVER (and renew as a subset of DISC) will not
> reach the CM server.
>
> 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.
>
> /Wes
>
> On Thursday, September 17, 2009 4:51:28 PM, Lelio Fulgenzi
> <lelio at uoguelph.ca> <mailto:lelio at uoguelph.ca> wrote:
>
> 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.
>
> Here's what I'm planning on doing (testing out on one scope to
> begin with):
>
> 1. Lower lease time on CallManager subscriber DHCP server from
> 8 days to 1 hour. Wait until all phones have a 1 hour lease.
> 2. Change IP helper address on interface to new DHCP server.
> 3. Deactivate scope on CallManager subscriber DHCP server.
> 4. Wait one hour until all phones have new lease on new DHCP
> server and all IP address conflicts are resolved.
> 5. Remotely reset phones that are not co-operating.
>
> Two questions:
>
> * 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.
> * Can I go a step further and lower the lease time to 30min or
> even 15 min without significant concern?
>
> We have about 7500 phones.
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Bad grammar makes me [sic]" - Tshirt
>
>
>
>
>
>
>
>
>
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