I consider myself a small l libertarian... myself, and those I know, do not support open borders in any way shape or form... as a matter of fact, the so called “compassionate conservatives” and the commies are the ones that support this open border crap ( bush, perry, mccain, mcromney, etc.) now the nut job wing of the libertarians (ron paul) may buy into this crap, but not us small l types.... lumping all libertarians into one basket is like saying all republicans are conservative.....
I, too, consider myself a small l libertarian, although my foreign policy views are anathema to almost all big L Libertarians.
Concerning immigration, I am 100% for open borders IF and only IF the immigrant is coming from a nation that is as free as this one and also allows open borders to Americans. There is currently no such nation. Therefore our borders must be guarded as closely as we guard our freedoms, lest we let the enemies of freedom use our Republic to vote away our Constitution and the legal recognition of our natural rights.
The Federal Government was given two jobs: protect the liberties of Americans (provide for the national defense, raise funds to provide for that defense and the operation of the Federal Government), make sure commerce *within the US* remains free (establish currency, deliver mail, make sure states aren’t impeding commerce). It does none of these adequately.