I am running a 750G with hotspot and RADIUS on the same box. I would like to whitelist one or two mac addresses. So that it will by pass the captive portal and have instant access.

http://wiki.mikrotik.com/wiki/Manual:IP ... ip-binding

IP-Binding HotSpot menu allows to setup static One-to-One NAT translations, allows to bypass specific HotSpot clients without any authentication

Just leave the address and to-address fields blank for a simple bypass.

Thanks again fewi.