We recently installed fiber linking our buildings enabling us to eliminate one ISP. We have three servers. One in the building with the ISP we are keeping (Verizon). Two servers are in the building with the ISP being eliminated (Comcast). I'm having issues with the workstations in the building formerly served by Comcast.
I changed the DNS server addresses on the two formerly Comcast-connected servers. The servers access the Internet without issue. The workstations, however, have Internet access problems unless I manually input the DNS server addresses on the workstations.
Prior to the ISP change, everything worked properly with the workstation TCP/IP properties set to automatically obtain an IP address and DNS. Now I must manually input the DNS server addresses for proper access.
What am I missing here?