Hello
Please help me to the need to
Owned a wireless network and I have a server Maikarotik
But I’m having a big problem
That someone had dropped and the addition of Maikarotik server in the network he had activated another Dhcp
There are two became Dhcp
How do I prevent Dhcp another in the network
i mean conflict dhcp … !!! 
:(
That strongly indicates you have a bridged/switched network for your end customers. On that bridging/switching gear implement traffic filters that drop DHCP traffic. DHCP works within a broadcast domain and cannot be blocked on a layer 3 hop like a router (DHCP relay crosses broadcast domains but you have to configure that explicitly, so that’s not what is happening in your case).
but how to active the bridged/switched on mikrotik ???
how to solution this problem !!!
and how to drope the dhcp traffic from the end coustmers !!!
…
http://wiki.mikrotik.com/wiki/Bridge_Filter_-_Blocking_DHCP_Traffic
this post maybe to block some ip or device’s !! but what the solution if the dhcp server “mikrotik device”
I actually told you the solution, but maybe you need more detail. In order to do that we have to know what your specific network looks like - if you only give generic information yo only get generic help.
Please provide a detailed network diagram of your network.
The wiki entry you found applies to ALL DHCP servers, regardless of whether they are made by Mikrotik or not. All DHCP servers work the same.
Just in case it helps in the meantime, you can find a client that received a DHCP lease from the wrong router. If it is a Windows machine “ipconfig /all” will tell you the IP address of the DHCP server, and “arp -a” to show the MAC address of that IP address (if it doesn’t show there, ping it first, then run the command again). With that MAC address you can hopefully figure out where the other router sits in your network, and disconnect it.
It is possible to prevent these issues but since you seem unable to create a solution based on generic advice you’re going to have to post a detailed network diagram including brand/model, IP addressing, and any other details you can think of to allow people to post advice specific to your network.
You may also want to look at the Consultant section on Mikrotik’s website and hire someone to help you out in person.