Can anyone explain the dns lookup name to address or adderss to name and the mac lookup ip to mac or mac to ip fields on the genreal tab?

see this thread: http://forum.mikrotik.com/viewtopic.php ... to+address

Essentially you can use these to keep map objects up-to-date, without the Dude creating duplicate objects when information changes, i.e., IP addresses in a dhcp environment.

Hope this helps