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Issue with secondary ip address

 

 

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cjinfantino at gmail

Nov 3, 2009, 9:12 AM

Post #1 of 4 (156 views)
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Issue with secondary ip address

Hello all,

I have a vlan that has a primary and secondary ip address. My DHCP
server is in the secondary ip address. The DHCP server is a windows 2003
server with the scope enabled and correct. If I plug a computer into a
switch with the vlan configured I cannot get an address. If I create a DHCP
server in the primary ip address range with the same scope and options and
disable the scope on the other DHCP server it works. I cannot figure out
what is going on.
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ck at sandcastl

Nov 3, 2009, 9:41 AM

Post #2 of 4 (145 views)
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Re: Issue with secondary ip address [In reply to]

do you have helper address set?

On Tue, Nov 3, 2009 at 9:12 AM, CJ <cjinfantino[at]gmail.com> wrote:

> Hello all,
>
> I have a vlan that has a primary and secondary ip address. My DHCP
> server is in the secondary ip address. The DHCP server is a windows 2003
> server with the scope enabled and correct. If I plug a computer into a
> switch with the vlan configured I cannot get an address. If I create a DHCP
> server in the primary ip address range with the same scope and options and
> disable the scope on the other DHCP server it works. I cannot figure out
> what is going on.
> _______________________________________________
> cisco-nsp mailing list cisco-nsp[at]puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>
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daniel.dib at reaper

Nov 3, 2009, 11:21 AM

Post #3 of 4 (140 views)
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Re: Issue with secondary ip address [In reply to]

-----Ursprungligt meddelande-----
Från: cisco-nsp-bounces[at]puck.nether.net
[mailto:cisco-nsp-bounces[at]puck.nether.net] För CJ
Skickat: den 3 november 2009 18:12
Till: cisco-nsp[at]puck.nether.net
Ämne: [c-nsp] Issue with secondary ip address

Hello all,

I have a vlan that has a primary and secondary ip address. My DHCP
server is in the secondary ip address. The DHCP server is a windows 2003
server with the scope enabled and correct. If I plug a computer into a
switch with the vlan configured I cannot get an address. If I create a DHCP
server in the primary ip address range with the same scope and options and
disable the scope on the other DHCP server it works. I cannot figure out
what is going on.

Hi,

You should try to use ip dhcp smart-relay. If you don't get a reply from
primary scope it will ask for the secondary address. See
http://www.cisco.com/en/US/docs/ios/12_1/iproute/command/reference/1rddhcp.h
tml#wp1046084

HTH Daniel


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database 4493 (20091009) __________

The message was checked by ESET NOD32 Antivirus.

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SHughes at GREnergy

Nov 4, 2009, 4:45 AM

Post #4 of 4 (131 views)
Permalink
Re: Issue with secondary ip address [In reply to]

You need to setup a "superscope" on the windows box that includes both
the primary and secondary subnets. Even if you don't hand out any
addresses in the primary subnet, it needs to exist and bound to the
same superscope as your secondary subnet.

Sent from my iPhone.

On Nov 3, 2009, at 11:19 AM, "CJ" <cjinfantino[at]gmail.com> wrote:

> Hello all,
>
> I have a vlan that has a primary and secondary ip address. My DHCP
> server is in the secondary ip address. The DHCP server is a windows
> 2003
> server with the scope enabled and correct. If I plug a computer into a
> switch with the vlan configured I cannot get an address. If I create
> a DHCP
> server in the primary ip address range with the same scope and
> options and
> disable the scope on the other DHCP server it works. I cannot figure
> out
> what is going on.
> _______________________________________________
> cisco-nsp mailing list cisco-nsp[at]puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
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