Multi-interface firewalls

[Peter Enderborg <pme @ abnamro-software . com>]

We need to set up an firewall with at least 8 ethernet interfaces, and
it   is good if they are 100Mbit/s interfaces.
Does it exist on the market ? Most of  the firewalls that I have seen
had only 3 interfaces. Some whould be very
easy to extend to 8, but what about the software ? I know that Linux
chould do it, but what about Firewall-1
on a sparc ? Any other good ideas ?