yes, shure. my bad.
anyhow, off course is ermal right, because:
firstly, he's a hero member :)
secondly, like efonne said, you need an virtual interface, just like it is build in "virtual server software" or "very expensive hw". i just wanted to know, what ng_eiface is. (http://www.gsp.com/cgi-bin/man.cgi?section=4&topic=ng_eiface)