DNS IP changed

DNS IP changed

Q: I have a network that has a small business server 2003, 2 XP Pro, 1 Win2K, and a PC running vista. This has been in place for about a year and everything has been running just fine until about a week ago.

Here is what’s happening: The server has its IP addresses hard coded, Its also the DHCP server. The internal IP Addresses are 192.168.17.x. The server is .2 and is setup as the DNS, WINS, & DHCP for the other PC's.

On the clients they get their IP address from the server and 5 to 10 min later the DNS server changes to 192.168.1.1. I can do a IPCONFIG /RENEW and reset the DNS to 192.168.17.2. Then sometime later the DNS changes back to 192.168.1.1. I don't notice this till I try to access the internet and everything slows down.

I have run Symantec AV, Microsoft Safety.Live.Com, and Trendmicro. none have found anything. No Virus, no spyware, nada.

A: It sounds like you've possibly got a rogue router on your network. Perhaps someone brought in a wireless one from home?

If you have two DHCP servers running in the same LAN, you may experience some issues. Case 1: The client has been using as router as DHCP server for two ...
www.chicagotech.net/troubleshooting/2dhcp.htm

Network troubleshooting

The issues of two DHCP servers in the same LAN Why can'tI see a computer even I can ping it What does "No more connections can be made to this remote ...
www.chicagotech.net/nettroublshooting.htm

Ipconfig

The issues of two DHCP servers in the same LAN Unexpected network failure or insufficient access or access is denied Using the netsh command to change ...
www.chicagotech.net/ipconfig.htm

The system has detected a conflict for IP address

Situation: the client reported some of their computers kept receiving: "The system has detected a conflict for IP address" error. ...
www.chicagotech.net/casestudy/ipconflict.htm

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