Avatar of Nuddsj
Nuddsj
 asked on

DHCP / seperate VLAN

Hi

After reading some posts here what I want to do seems to be possible but if someone could confirm and if it is possibe provide some pointers that would be great.

So basically I want to create a new VLAN so that I can move IP phones off my main network to this seperate VLAN. I have x1 2008 R2 server running as DHCP, with one NIC on the main network.

I have HP layer 3 switches, so I created a new VLAN as shown below;

vlan 100
   name "VOIP_VLAN"
   ip helper-address (IP of DHCP server)
   ip address 192.168.50.1 255.255.255.0
   tagged 36
   exit

vlan 1
   name "DEFAULT_VLAN"
   untagged 1-35,37-A4
   ip address XXX.XXX.XXX.XXX 255.255.255.0
   no untagged 36
   ip igmp
   exit



I have created a new scope on the DHCP server, issuing out 192.168.50.100-200, however when I plug my laptop into port 36 I dont get a DHCP address

Any help would be great

Thanks
Switches / HubsNetworking

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Last Comment
neilpage99

8/22/2022 - Mon
itnetworkn

It sounds like you need to make sure you have allowed the IP of your DHCP server to be a DHCP relay in your VLAN. You will do this on the switch. Let me know if you need more info on how to do this.
itnetworkn

Sorry, I am now seeing where you have the ip helper address listed. If you have physical connectivity to the DHCP server from vlan 100, then I would double check the scope and make sure that it is correct. Maybe try to disable it and enable it.

The only time I can remember having a problem when I set it up as you have described is when the scope was not working correctly and I fixed it from the DHCP server.
neilpage99

Make sure you can ping both ways; from the DHCP server to 192.168.50.1 (switch)  and  from 192.168.50.1 (switch) to the DHCP server.
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Nuddsj

ASKER
Hi

On the switch I can ping the DHCP server, though thew switch is also on the main VLAN so would I somehow need to ping from the new vlan on the switch

Though the DHCP server I cant ping the 192.168.50.1 which I gave the VOIP_VLAN
SOLUTION
itnetworkn

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Nuddsj

ASKER
Hi

I guess that is the problem.

Alternative option if easier, should I just add a second NIC to the DHCP give that NIC a IP on the same subnet as the VOIP_VLAN and patch into a port of the switch that I have added to that VLAN?
Nuddsj

ASKER
I think I have just missed a step. Just re-checked the switch and under IP configuration, "IP routing is disabled"...
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