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→Understanding the lokkit Firewall Customization Screen
'''DHCP''' - This refers to the Dynamic Host Configuration Protocol. This is a system by which devices are dynamically provided IP addresses instead of having static IP addresses manually assigned by users or system administrators. If you obtain your address from a DCHP server (such as one built into a wireless router or provided by your company) then you will want to enable DHCP on this page to enable your system to negotiate with the DHCP server to obtain an IP address.
'''SSH''' - The secure shell provides an encrypted mechanism for allowing password protected remote access to your system. With SSH you can remotely log into to your system, copy files to and from your system and anotehr system and perform remote execution of programs. If you need remote access to your system you will need to activate this. If you do not need remote access leave this disabled. Note that tyhe the ssh server is not instalkled installed by default on Ubuntu Linux.
'''Telnet''' - Telnet provides remote terminal access to your system. It does not use encryption and use is strongly discouraged. Leave this disabled and use SSH instead fopr remote access.