Our company is on a 192.168.14.x private network. Our DNS/DHCP server is at 192.168.14.5 and the default gateway is at 192.168.14.1 In the past week, random computers on our network have been getting the incorrect DNS server of 192.168.14.235. This address is the Cisco phone system.
When a computer has the incorrect DNS server, they have no connectivity to the Internet. We tried resolving the problem by running ipconfig /release and /renew, and ipconfig /flushdns; we also tried a winsock reset, None of these things resolved the issue. We tried assigning a static address, which worked, but when we removed the static if failed back to the 14.235 phone system address again.
The computer is running Win10 Pro X64. The weird part of this is that the PHone system does not have any wireless conbnection and the problem oly affects the wireless; the wired connection works properly
Incidentially, there have been no configuration changes to any networking equipment or to the phone system this year and this problem 'suddenly' popped up last week.
Does anyone have any idea why this is happening and how to resolve it?