DHCP
DHCP server and client, lease, unauthorized DHCP: all dojo articles on this topic.
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Unauthorized DHCP server: how to detect and block it with MikroTik
An unauthorized DHCP server, often a mall WiFi router connected "backwards", can bring a LAN to its knees in minutes. With MikroTik, you can detect it using /ip dhcp-server alert, which notifies you when a server other than the valid one responds, and block it using bridge DHCP snooping, which in RouterOS 7 accepts DHCP responses only from trusted ports.
DojoMikroTik DHCP server: run a script on every lease
The RouterOS DHCP server can run a script every time it assigns or releases an address: this is the lease-script. Inside the script, variables such as $leaseBound, $leaseActIP, and $leaseActMAC are already available, allowing you to log new devices, send email notifications, or add the client to an address list with an expiration.
DojoHow to create a WiFi hotspot with MikroTik and RouterOS 7
A WiFi hotspot with a captive portal on MikroTik is built in seven steps: reset, WAN, guest network on a bridge, radio, /ip hotspot setup wizard, test, and final cleanup. In RouterOS 7, the radio part changes significantly, as recent models use the new wifi package instead of wireless. The addresses in the example are from my lab: adapt them to your network.