Quote Originally Posted by baboyako View Post
it is in the 'Common Travel Area' so there should not be a passport control.

but I might be wrong

http://en.wikipedia.org/wiki/Common_Travel_Area

Heres more details allthough do check up with the irish authorities just to be sure

Quickly reading though i found this passage

Until 1997, there was free movement for all nationalities within the area. The Aliens (Amendment) (No. 3) Order, 1997 order empowers Irish immigration officers to carry out immigration checks on persons who are not Irish or British citizens arriving from the UK and to refuse such persons leave to land on the same grounds as apply if they arrive from outside the common travel area.

I have heard of many poping over the northern irish border with no probs but if you did get stoped you may have problems depending on the guards.