Rogue DHCP Router on the LAN

NicolausX · Mar 3, 2014

Please a bit of help i have a Rogue router on the LAN that's effective stops my network,
My network is conected by DHCP MAC address cable , i have determined that a router on the LAN is changing my LAN card settings,
The network administrator in not able to find how it is,
From my gateway : 176.126.176.11 it go's to a rooter's gateway on the LAN 192.162.10.1 after that i have no network, if i type in browser 192.162.10.1 it connects me to the router on the LAN , i can see the router interface asking me for password and user name .

I have NO ROOTER someone on the LAN has !!!

How can i stop this rooter on my LAN to affect my computers network ? how can i block he's router affect my Network card settings ?

Please help me i'm new 1 weeks without net , the network administrator does not know how has this rooter (we are on the countryside)..
I have 2 -3 hours of net at 2 days distance probably when the guy stops his rooter or sleeps.

Please help me ..

All the best.

Someone Somewhere · Mar 3, 2014

Set a static IP address and DNS settings for whatever the correct details are.

The admin should be able to work out what the MAC address is from the router's IP, and there find which port on the switch it's connected to, and raise hell with the owner.

NicolausX · Mar 3, 2014

Thanks for such a quick answer , i tried to set manual ip , mask , gateway but at that point it stops seeding and receiving packets since we have a DHCP auto setting up by MAC...

bill001g · Mar 3, 2014

Sounds like either your network admin does not have a clue or they are using the cheapest switches and routers on the market. Many commercial switches have a feature called DHCP snooping to prevent this problem and even ones that don't it is trivial to track a mac address down.

As stated above you will need to use static address/gateway/dns. If the rouge DHCP server is duplicating the gateway address then you will need to also put in a static ARP entry in your PC.

Someone Somewhere · Mar 3, 2014

Even if you have statically assigned DHCP addresses, you should be able to manually set it to those addresses.

Forgot about the gateway. Take a note of all the current settings (IP address, gateway, subnet mask, DNS servers) and set them permanently.

NicolausX · Mar 3, 2014

Ok folks i will try this, i'm new at a neighbors computer , please don't close this topic in a few hours or 1 day i will post it solve it.
Thanks to both of you for helping me,

Just for posterity , i'm a graphic designer because of this network problem i've lost 600 Euros in LOGO projects because i didn't answer my clients, so i'm desperate.
A good day.

Someone Somewhere · Mar 3, 2014

If it's that essential to your job, you should probably have a backup anyway, e.g. USB cellphone modem, or tethering. There's no SLAs on consumer broadband.

We don't normally close old posts.

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