Mailing List Archive: Cisco: VOIP

trying to setup dhcp scope for iphones on dc

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jgrace at digitelusa

Mar 26, 2006, 7:16 PM

Post #1 of 7 (896 views)
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trying to setup dhcp scope for iphones on dc

Is there trick to get the ip phone to grab a ip address from the dhcp
server. We have a dc which is a dhcp server for our data. And we are
configuring another scope for the ip phones. But phones are not grabing a
ip. We have the ip helper config under the voice vlan int. what else are
we missing.

James D. Grace

CCNP CCNA MCSE MCDBA

Sr. System Engineer / Professional Svc.

Digitel Corporation

lelio at uoguelph

Mar 26, 2006, 8:50 PM

Post #2 of 7 (887 views)
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Re: trying to setup dhcp scope for iphones on dc [In reply to]

Is this a new install? i.e., have the phones got an IP address from a DHCP server before? If new, and your DHCP server is not on the same broadcast domain as the phones, you have to put an 'ip helper address' or similar on the router interface. If this is an additional DHCP server, I remember that Windows wants all DHCP servers to be registered with each other or something like that. If the phones already had an IP address, they will try to 'renew' the existing IP address, so you'll have to make sure that that scope no longer exists.

If you can give us some more details, that would help.

----- Original Message -----
From: James Grace
To: cisco-voip [at] puck
Sent: Sunday, March 26, 2006 10:16 PM
Subject: [cisco-voip] trying to setup dhcp scope for iphones on dc

Is there trick to get the ip phone to grab a ip address from the dhcp server. We have a dc which is a dhcp server for our data. And we are configuring another scope for the ip phones. But phones are not grabing a ip. We have the ip helper config under the voice vlan int. what else are we missing.

James D. Grace

CCNP CCNA MCSE MCDBA

Sr. System Engineer / Professional Svc.

Digitel Corporation

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BillS at tns

Mar 27, 2006, 6:49 AM

Post #3 of 7 (882 views)
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Re: trying to setup dhcp scope for iphones on dc [In reply to]

Multiple subnets on a single router interface will confuse DHCP unless you
specify that they are "shared subnets" on the DHCP server. Sniff the wire
at your DHCP server and see if any DHCP requests are coming in from the
phones. If so, and they're being routed there by way of an ip
helper-address, is the gateway address they're coming from within your phone
scope?

I don't know Windows DHCP but it sounds like the Windows equivalent of a
shared subnet config is what's needed.

Bill

_____

From: James Grace [mailto:jgrace [at] digitelusa]
Sent: Sunday, March 26, 2006 10:16 PM
To: cisco-voip [at] puck
Subject: [cisco-voip] trying to setup dhcp scope for iphones on dc

Is there trick to get the ip phone to grab a ip address from the dhcp
server. We have a dc which is a dhcp server for our data. And we are
configuring another scope for the ip phones. But phones are not grabing a
ip. We have the ip helper config under the voice vlan int. what else are
we missing.

James D. Grace

CCNP CCNA MCSE MCDBA

Sr. System Engineer / Professional Svc.

Digitel Corporation

mfa at crec

Mar 27, 2006, 8:30 AM

Post #4 of 7 (895 views)
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Re: trying to setup dhcp scope for iphones on dc [In reply to]

We have IP helper-addresses configured on the VoIP VLAN interface on our
core 3550 switch; we used to use a router but it was configured in the same
way.

interface Vlan102
ip address 10.251.10.3 255.255.254.0
ip helper-address 10.230.48.200
ip helper-address 10.230.48.199

The DCs are the DHCP servers, serving split DHCP scopes. I'm pretty sure I
can't paste a screenshot of the Windows config into a message for this list,
but I'll send you a private e-mail with it in it.

Mike Armstrong
UF/IFAS CREC
Lake Alfred, FL

> Date: Sun, 26 Mar 2006 22:16:16 -0500
> From: "James Grace" <jgrace [at] digitelusa>
> Subject: [cisco-voip] trying to setup dhcp scope for iphones on dc
> To: <cisco-voip [at] puck>
> Message-ID: <200603262224203.SM01568 [at] 372943477>
> Content-Type: text/plain; charset="us-ascii"
>
> Is there trick to get the ip phone to grab a ip address from the dhcp
> server. We have a dc which is a dhcp server for our data. And we are
> configuring another scope for the ip phones. But phones are not grabing a
> ip. We have the ip helper config under the voice vlan int. what else
> are
> we missing.
>
>
>
> James D. Grace
>
> CCNP CCNA MCSE MCDBA
>
> Sr. System Engineer / Professional Svc.
>
> Digitel Corporation

_______________________________________________
cisco-voip mailing list
cisco-voip [at] puck
https://puck.nether.net/mailman/listinfo/cisco-voip

rratliff at cisco

Mar 27, 2006, 8:48 AM

Post #5 of 7 (889 views)
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Re: trying to setup dhcp scope for iphones on dc [In reply to]

Do you see reservations being allocated for the phones on the DHCP
server? If not then the requests are probably not making it to the
server or the server doesn't like something about them. If you see
the reservations on the server then my guess is the response is not
making it to the phone.

-Ryan

On Mar 27, 2006, at 11:30 AM, Mike Armstrong wrote:

We have IP helper-addresses configured on the VoIP VLAN interface on our
core 3550 switch; we used to use a router but it was configured in
the same
way.

interface Vlan102
ip address 10.251.10.3 255.255.254.0
ip helper-address 10.230.48.200
ip helper-address 10.230.48.199

The DCs are the DHCP servers, serving split DHCP scopes. I'm pretty
sure I
can't paste a screenshot of the Windows config into a message for
this list,
but I'll send you a private e-mail with it in it.

Mike Armstrong
UF/IFAS CREC
Lake Alfred, FL

> Date: Sun, 26 Mar 2006 22:16:16 -0500
> From: "James Grace" <jgrace [at] digitelusa>
> Subject: [cisco-voip] trying to setup dhcp scope for iphones on dc
> To: <cisco-voip [at] puck>
> Message-ID: <200603262224203.SM01568 [at] 372943477>
> Content-Type: text/plain; charset="us-ascii"
>
> Is there trick to get the ip phone to grab a ip address from the dhcp
> server. We have a dc which is a dhcp server for our data. And we are
> configuring another scope for the ip phones. But phones are not
> grabing a
> ip. We have the ip helper config under the voice vlan int. what
> else
> are
> we missing.
>
>
>
> James D. Grace
>
> CCNP CCNA MCSE MCDBA
>
> Sr. System Engineer / Professional Svc.
>
> Digitel Corporation

_______________________________________________
cisco-voip mailing list
cisco-voip [at] puck
https://puck.nether.net/mailman/listinfo/cisco-voip

_______________________________________________
cisco-voip mailing list
cisco-voip [at] puck
https://puck.nether.net/mailman/listinfo/cisco-voip

jgrace at digitelusa

Mar 27, 2006, 8:57 AM

Post #6 of 7 (885 views)
Permalink

Re: trying to setup dhcp scope for iphones on dc [In reply to]

Thank you

We add a static route on the dhcp server for the voice vlan and it started
working

_____

From: Mike Armstrong [mailto:mfa [at] crec]
Sent: Monday, March 27, 2006 11:34 AM
To: jgrace [at] digitelusa
Subject: Re: [cisco-voip] trying to setup dhcp scope for iphones on dc

We have IP helper-addresses configured on the VoIP VLAN interface on our
core 3550 switch; we used to use a router but it was configured in the same
way.

interface Vlan102
ip address 10.251.10.3 255.255.254.0
ip helper-address 10.230.48.200
ip helper-address 10.230.48.199

The DCs are the DHCP servers, serving split DHCP scopes. I'm pretty sure I
can't paste a screenshot of the Windows config into a message for this list,
but I'll send you a private e-mail with it in it.

Mike Armstrong

UF/IFAS CREC

Lake Alfred, FL

> Date: Sun, 26 Mar 2006 22:16:16 -0500
> From: "James Grace" < <mailto:jgrace [at] digitelusa>
jgrace [at] digitelusa>
> Subject: [cisco-voip] trying to setup dhcp scope for iphones on dc
> To: < <mailto:cisco-voip [at] puck> cisco-voip [at] puck>
> Message-ID: < <mailto:200603262224203.SM01568 [at] 372943477>
200603262224203.SM01568 [at] 372943477>
> Content-Type: text/plain; charset="us-ascii"
>
> Is there trick to get the ip phone to grab a ip address from the dhcp
> server. We have a dc which is a dhcp server for our data. And we are
> configuring another scope for the ip phones. But phones are not grabing a
> ip. We have the ip helper config under the voice vlan int. what else
are
> we missing.
>
>
>
> James D. Grace
>
> CCNP CCNA MCSE MCDBA
>
> Sr. System Engineer / Professional Svc.
>
> Digitel Corporation

Attachments:

image001.jpg (34.2 KB)

JEvans at glgroup

Mar 27, 2006, 9:01 AM

Post #7 of 7 (881 views)
Permalink

Re: trying to setup dhcp scope for iphones on dc [In reply to]

Did you add Option 150 (Cisco TFTP) under Scope Options and specify the
CM's?

> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 27 Mar 2006 11:30:38 -0500
> From: "Mike Armstrong" <mfa [at] crec>
> Subject: Re: [cisco-voip] trying to setup dhcp scope for iphones on dc
> To: <cisco-voip [at] puck>
> Message-ID: <008001c651bb$c88bd7e0$400cfb0a [at] crec>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> We have IP helper-addresses configured on the VoIP VLAN interface on
our
> core 3550 switch; we used to use a router but it was configured in the
> same
> way.
>
> interface Vlan102
> ip address 10.251.10.3 255.255.254.0
> ip helper-address 10.230.48.200
> ip helper-address 10.230.48.199
>
> The DCs are the DHCP servers, serving split DHCP scopes. I'm pretty
sure
> I
> can't paste a screenshot of the Windows config into a message for this
> list,
> but I'll send you a private e-mail with it in it.
>
> Mike Armstrong
> UF/IFAS CREC
> Lake Alfred, FL
>
> > Date: Sun, 26 Mar 2006 22:16:16 -0500
> > From: "James Grace" <jgrace [at] digitelusa>
> > Subject: [cisco-voip] trying to setup dhcp scope for iphones on dc
> > To: <cisco-voip [at] puck>
> > Message-ID: <200603262224203.SM01568 [at] 372943477>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Is there trick to get the ip phone to grab a ip address from the
dhcp
> > server. We have a dc which is a dhcp server for our data. And we
are
> > configuring another scope for the ip phones. But phones are not
grabing
> a
> > ip. We have the ip helper config under the voice vlan int. what
else
> > are
> > we missing.
> >
> >
> >
> > James D. Grace
> >
> > CCNP CCNA MCSE MCDBA
> >
> > Sr. System Engineer / Professional Svc.
> >
> > Digitel Corporation
>
>

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https://puck.nether.net/mailman/listinfo/cisco-voip

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