I'm looking for a list of firewalls (any flavor) that are transparent, yet
do not require program replacement on the client. I already know of two such,
FW-1 from Checkpoint and JANUS from Border Network Technologies. Does anyone
know of any others? I theorize that if we assume that everyone's firewall
works as advertised, that the main differences will be cost and ease-of-use.
(It could be argued that ease-of-use is just another cost factor.) So, many
firewalls will have GUIs. But the major headache, which some avoid, is
replacing (and re-replacing) client programs.