DHCP not working (Default Gateway does not exist)
Posted on 2014-03-26
Here's today's intriging problem to get your teeth into.
SBS 2011 Server installed afresh as of yesterday (predecessor's RAID card thrashed all the disks!)
IPs set up as:
Default Gateway 192.168.1.254
Subnet Mask 255.255.255.0
DNS forwards to 18.104.22.168 and 22.214.171.124 fro the server, DHCP and NIC all set as above.
The Server (.2) can see the default Gateway (.254) and resolve externally.
Now here's the rub!
The workstations running DHCP can see ALL IPs in the internal range except the Default Gateway and therefore have no Internet access. ipconfig /all from any workstation reports all the numbers correctly???
If I change to Default Gateway/Router to .1 you have exactly the same problem.
The workaround has been to force the IP numbers for the network cards and then it behaves as if there is no problem. However this is a crude fix and doesn't solve the problem with wireless devices, like mobiles, that run in a DHCP word most of the time. There are also some other odd effects such as Outlook having to be run not in Cached mode as it doesn't work otherwise.
Any ideas? I don't! I have run "fing" and there don't appear to be duplicate IP numbers and the DHCP in the router is definitely turned off.
Many thanks - EH