Something happened in our server room over the weekend that had me in the office late Saturday night replacing two switches.
After powering down both racks, I have an issue where none of the computers that use DHCP are getting the settings required for our network.
If they are set to static, everything works fine. So I think the issue is with the DHCP server.
We have a Juniper Netscreen NS-50 hardware firewall/router that does the DHCP serving.
It is supposed to hand out an address in the 192.168.1.0 range, it's private IP as the gateway and a Windows Server box's IP for the primary DNS.
I can see that DHCP is still enabled in the NS50, so either it's not working properly or it's clashing with something else on our network...
How can I fault find this in order to get it working again?