+ - bridge utilities
+ http://bridge.sourceforge.net/
+ - iproute2
+ http://developer.osdl.org/dev/iproute2
+ - arping (part of iputils package)
+ ftp://ftp.inr.ac.ru/ip-routing/iputils-current.tar.gz
+ - mdadm (Linux Software Raid tools) (needed only with drbd 0.7.x)
+ http://www.kernel.org/pub/linux/utils/raid/mdadm/
+ - Python 2.4
+ http://www.python.org