I have 2 laptops connected on a home network, both are configured the same, i.e. on the same workgroup and with Windows XP. They are both setup with dynamic addressing on both the IP and the DNS settings. However one of the laptops seems to randomly lose it's DNS settings and ends up grabbing a 192... address. This always happens on the same laptop, the other laptop is fine. I tried flushing the DNS entries to see if it would grab the correct DNS address, but it never would. As a temp fix to the issue I went ahead and statically assigned the correct DNS entries to the bad laptop. However I would like to know why this keeps happening on this laptop and not the other. Any help would be appreciated.
Losing DNS IP
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The 192.168.x.x address is normal if you have a router. Here's what I see on this 100% working workstation. Note the DNS address for normal operation. 
Windows IP Configuration
Host Name . . . . . . . . . . . . : MAIN
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : home
Ethernet adapter Local Area Connection 3:
Connection-specific DNS Suffix . : home
Description . . . . . . . . . . . : Marvell Yukon 88E8001/8003/8010 PCI Gigabit Ethernet Controller
Physical Address. . . . . . . . . : 00-17-31-00-90-D6
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.8
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
Lease Obtained. . . . . . . . . . : Tuesday, January 09, 2007 10:16:50 PM
Lease Expires . . . . . . . . . . : Wednesday, January 10, 2007 10:16:49 PM
Windows IP Configuration
Host Name . . . . . . . . . . . . : MAIN
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : home
Ethernet adapter Local Area Connection 3:
Connection-specific DNS Suffix . : home
Description . . . . . . . . . . . : Marvell Yukon 88E8001/8003/8010 PCI Gigabit Ethernet Controller
Physical Address. . . . . . . . . : 00-17-31-00-90-D6
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.8
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
Lease Obtained. . . . . . . . . . : Tuesday, January 09, 2007 10:16:50 PM
Lease Expires . . . . . . . . . . : Wednesday, January 10, 2007 10:16:49 PM
In this case the DNS entry for this PC is supposed to be 10.xx.xx.xx address, and it will sometimes grab that address, but then all of a sudden it will lose the address. While another PC connected to the same connection will keep the correct DNS address.
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Another option is to use the actual DNS IP address of your ISP rather than the router's IP address. Somethings this is more reliable. You can connect to your router and check the status if you need to find out what it is.
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