My single DC is also my DHCP/DNS server (Windows server 2008). The workstations are all set to acquire dynamic IP address from the DHCP server and everything seems to work fine except that the workstations get the IP address of our ISP's DNS servers.
My sonicwall firewall has DHCP enabled as well in a different subnet to assign ip address for vpn clients. (NSA 2400)
Is there a way to find out from where these workstations are acquiring the DNS settings?
I am adding the ipconfig /all result from a client PC below.
Windows IP Configuration
Host Name . . . . . . . . . . . . :
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . :
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) 82578DM Gigabit Network Co
on
Physical Address. . . . . . . . . : 6C-62-6D-E6-D6-04
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::5009:c404:b075:a49f%12(Prefer
IPv4 Address. . . . . . . . . . . : 192.168.5.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, April 10, 2014 9:12:28 PM
Lease Expires . . . . . . . . . . : Sunday, April 13, 2014 9:12:26 PM
Default Gateway . . . . . . . . . : 192.168.5.1
DHCP Server . . . . . . . . . . . : 192.168.4.248
DHCPv6 IAID . . . . . . . . . . . : 275538541
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-B5-78-62-6C-62-6D-E6
DNS Servers . . . . . . . . . . . : 212.77.192.59
212.77.192.60
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter isatap
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 9:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 11:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes