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DHCP via Juniper firewall

Posted on 2012-09-04
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Last Modified: 2012-09-18
Hi all,

We are trying to allow DHCP leases from two seperate vlans which are seperated by a Juniper firewall.  Is there any type of ip-helper or equivalent is needed?
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Question by:FREDARCE
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Expert Comment

by:Sanga Collins
ID: 38365873
How is the networks being separated? I have a similar setup with a sub interface in a different VLAN with it own dhcp server. I use this for business wifi network and guest wifi network at client locations. More details on your setup will help us find you a workable solution
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by:FREDARCE
ID: 38367711
The setup is something like this:

dhcp server [vlan A] >> switch [switch vlan A] >> juniper firewall interface [vlan A] >> << juniper firewall interface [vlan B] << switch [vlan B] << dhcp client [vlan B]

The dhcp server has been configured with a scope  for vlan B, however,  the dhcp client is not recieving IP address from the DHCP server.

thanks
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LVL 18

Expert Comment

by:Sanga Collins
ID: 38367767
So just to be clear. You have one DHCP server and it sits in VLAN A. It has the scope for VLAN B configured and you would like clients connected to the switch for VLAN B to get up addresses across VLANs?
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Author Comment

by:FREDARCE
ID: 38382741
Yes,   that's correct sangamc.

thanks
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Sanga Collins earned 2000 total points
ID: 38382872
It looks like DHCP relay may be able to assist you. On older firmware it was only permitted from trust - untrust zones or across a VPN.

http://kb.juniper.net/InfoCenter/index?page=content&id=KB4245

If DHCP relay agent is not sufficient for your environment, How about using the built in DHCP server in the juniper itself? This will greatly simplify the setup and allow you more flexibility with handling multiple DHCP scopes across VLANs
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