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Dis-jointed Network.

Monday, March 7th, 2011

I ran into this while trying to fix a wireless connection at a Clients house last week. Here is the setup:
Juniper Firewall acting as router from internet via Static IP from Qwest.
Juniper Firewall is also a DHCP server for the internal network. It is handing out 192.168.1.X/24 with a gateway address of 192.168.1.1
UsRobotics G-max wireless router and firewall connected to the Juniper Firewall.
This device is getting Wan IP address from the Juniper Firewall via DHCP 192.168.1.2/24. This device is also configured to hand out DHCP of 192.168.1.X/24 with a gateway address of 192.168.1.1.
This was causing a disjointed network error. The wireless would connect but it was limited access. If you plugged a Cat5 cable into the Gmax router you would get the same error.
After doing some research I found that this should have never worked.
I left the IP address and DHCP on the Juniper firewall alone. I changed the IP address on the Gmax Router to hand out DHCP of 10.0.0.X/24. This gives the wireless computers IP addresses of 10.0.0.x/24 with a gateway of 10.0.0.1. The Gmax now gets a DHCP address from the Juniper firewall on the 192.168.1.X network with a gateway of 192.168.1.1.

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