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DNS Server Randomly Changes

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by dustin weidner 1 view

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Most of the time when a user logs on, he or she receives the proper DNS server IP addresses. They receive addresses via DHCP. However, after a few minutes, their DNS server IP address changes to 192.168.1.1. A quick release/renew fixes the problem temporarily but it keeps happening.

Has anyone experienced a similar problem? If so how did you resolve it?

Parts of this post were copied and pasted from a previous article that didn't provide an answer.

7 replies

by charles bundy

You don't say what the "proper" DNS server IP is, but that 192.168.1.1 address sounds like a broadband router trying to supply itself as the "DNS" provider via built in DHCP services.

by dustin weidner

To be more clear, this is a school network with a primary DNS Server specified in the DHCP scope along with two other secondary DNS Servers. None of which are 192.168.1.1 .

by ic-it

Charles is refering to may be a rogue router and not a normal part of your network.
Either a student or faculty/staff member may have wanted a few more ports in an area.

by cg it

that's 192.168.1.1 which is usually the default address for a linksys router, and they have DHCP services enabled by default...

If they had plugged in the school network using the WAN port, they would not have flagged themselves. They could create their own subnet and unless you look at leases, you'd never know unless you happen to look at leases.

by nexs

If you havent done it already, check the computer in question to see if it is picking up any other network devices or wireless networks.

if it's a wireless router as many have stated previously, you should be able to see it locally

by dustin weidner

Thanks, you're right there was a rogue router on the network. I knew there was, it just didn't cross my mind that something like that would happen. Thanks for your input!

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