the office have switched from an adsl to cable broadband isp after a lot of downtime from the provider so i went to change the adsl router to a cable modem router today but none of the workstations could connect to the server or internet afterwards. The SBS 2011 connected to the internet fine but couldn't connect to any of the workstations either so i removed the cable router & put back the adsl router & all was fine again, or so i thought. The only issue i can see is that in the network & sharing center on the SBS it's connected to Network 4 not the domain but everything seems to be working ok for all the users.
To set up the new router i logged into it from a laptop & changed the lan ip address & subnet mask to the same as the old router, turned off DHCp & forwarded ports 80, 443, 110 & 25 to the SBS as was done on the old router.
Is there a procedure i should have followed that i didn't or where have i gone wrong?
When the workstations can't access the server they're ipconfig is still configured to the right settings.
I tried restarting the server & workstations but no joy.
On the worksattions i can still see the ADSL router in Network but can't release/renew the ipconfig.
All workstations are Win 7 clean installs.
The network is all wired.
Any help is much appreciated.