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DHCP-relay problem with 2 VLANs

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Zahar
Frequent Advisor

DHCP-relay problem with 2 VLANs

Hello everyone!

The story:
We need to create two separate VLANs for Office and Service-center. We have Procurve 4204vl switch. Office-VLAN (192.168.10.0/24) contains DNS, DHCP, NAS and GW for internet access. Service-VLAN (192.168.11.0/24) will have a lot of incoming PCs. Computers from Service-VLAN must not see computers from Office-VLAN.

Primary task:
Computers from Service-VLAN should be able to receive IP configuration from DHCP (192.168.10.7) and have access to internet through GW (192.168.10.99).

Secondary task:
Computers from Service-VLAN should be able to access files on NAS (192.168.10.3).

I've created two VLANs. Configured two scopes on DHSP server (192.168.10.0/24 and 192.168.11.0/24). Enabled "ip routing" and "dhcp-relay" on switch. Added ip helper-address in Service-VLAN pointing to DHCP (192.168.10.7).

The problem - clients in Service-VLAN do not receive configuration from DHCP server.

Please see attached image and config for refence.

Please advise.
4 REPLIES
Zahar
Frequent Advisor

Re: DHCP-relay problem with 2 VLANs

Here is config from switch:


hostname "YYY"
ip routing
snmp-server community "public" Unrestricted
vlan 1
name "DEFAULT_VLAN"
untagged 1-20,23-26
ip address 192.168.10.111 255.255.255.0
no untagged 21-22
exit
vlan 2
name "SERVICE_VLAN"
untagged 21-22
ip address 192.168.11.111 255.255.255.0
ip helper-address 192.168.10.7
exit
Usaia Tawakevou
Frequent Advisor
Solution

Re: DHCP-relay problem with 2 VLANs

Verify that the DHCP scope is active and also the gateway address of the DHCP server is right. If it is using the GW(192.168.10.99) make sure that it knows where 192.167.11.0/24 network is

Also add a route a default route and point it to the GW

HTH
Zahar
Frequent Advisor

Re: DHCP-relay problem with 2 VLANs

You was right.

I've added to switch GW address and 192.168.11.0/24 subnet to router.

Thanks!
Zahar
Frequent Advisor

Re: DHCP-relay problem with 2 VLANs

Got it working =)