DHCP between subnets/VLANs

[Quicksilver_SB]

Scenario:
Two AD sites in a Windows Domain (two physical locations interconnected via fibre 10GB)

Two different subnets (10.1.0.0/16 and 10.6.0.0/16)

VLAN 1 (Default VLAN) - (10.1.10.0/23 and 10.6.10.0/23)

VLAN 30 "servers" - (10.1.30.0/23 and 10.6.30.0/23)

VLAN 70 "wired devices" - (10.1.70.0/23 and 10.6.70.0/23)

VLAN 80 "wireless devices" - (10.1.80.0/23 and 10.6.80.0/23)

Site 1

VLAN 30 : DHCP server 10.1.30.11 (scope1 10.1.70.2-10.1.71.254, scope2 10.1.80.2-10.1.81.254, scope3 10.6.70.2-10.6.71.254, scope4 10.6.80.2-10.6.81.254*)

VLAN 70 : Workstation that receives 10.1.70.0/23 address via DHCP

VLAN 80 : Laptop that receives 10.1.80.0/23 address via DHCP

Site 2

VLAN 70 : Workstation that receives 10.1.70.0/23 address via DHCP

What we want is that the "wired devices" and "wireless devices" at site 2 receives an 10.6.70.0/23 resp. 10.6.80.0/23 address.

Anyone got any ideas of how to configure this? I can post the current config if needed...

Any help is much appreciated!

Cheers

(* added)

[TerjeAFK · Accepted solution]

What is doing the routing between the two sites and between the VLANs at both sites? You need to configure the VLAN interfaces for VLAN 70 and 80 at site 2 (the default gateway for each VLAN) with a DHCP relay (IP helper) pointing to your DHCP server.

Also I do not see a DHCP scope for VLAN 80 at site 2 on your DHCP server?

[Quicksilver_SB]

Thanks for your reply.

IP routing in the procurves... no separate routers in between. All VLANs are configured on the other end with ip helpers set to 10.1.30.11 (the DHCP server)

There is also a scope for VLAN 80 configured for the 10.6.80.0/23 net... my mistake.

[Quicksilver_SB]

Figured it out... it was a silly mistake with the routing...

[Vince-Whirlwind]

I'm a bit confused:

VLAN 70 "wired devices" - (10.1.70.0/23 and 10.6.70.0/23)

Site 1

VLAN 70 : Workstation that receives 10.1.70.0/23 address via DHCP

Site 2

VLAN 70 : Workstation that receives 10.1.70.0/23 address via DHCP

This seems to indicate that you have trunked VLAN70 between both sites and you have two subnets on it.

Is that how it is setup?
If so, you'll need secondary IPs on the VLAN interfaces where your routing is being done.

(And ideally, you should have a seperate VLAN for each subnet).

I think your best bet is to forget about DHCP for the moment and statically configure a device onto each subnet, ensuring that each device can ping its default gateway, and also ping devices in other subnets.

Only once you have a workable network design should you then move onto getting DHCP working.

[TerjeAFK]

I assume that was a typo and that they are using 10.6.70.0/23 for VLAN 70 at site 2. And not using VLAN trunking, just routing.

[Vince-Whirlwind]

OK, that makes sense. It is my habit to see the worst-case scenario....