Sorry to catch up so late...
Additionally to moblock and mobloquer you need blockcontrol from http://moblock-deb.sourceforge.net
(previously blockcontrol was named moblock-control).
Further you should use moblock from the cvs repository (http://developer.berlios.de/cvs/?group_id=2509
), which requires compiling again with the libnetfilter development headers. But if I understood the thread correctly, then this is no more problem.