I'm helping a friend with a setup: in their office they have several quite elderly machines linked together on an ethernet, and connected to the outside world via a Dlink DSL-504 router. I've installed NOD32 on each of the machines, and Kerio PF on the one machine running Win 2000. All the others are running 98, and I've had to opt for ZA as software firewall on these machines. But it is so big and heavy that it's slowing them down - and configuring it properly so that all the machines can consistently communicate is proving to be a pain. (Yesterday, I could ping each machine from every other, but still had great difficulty saving documents across the network to the server. If anyone has any solutions to this problem, I would be grateful also. I have including 192.168.0.0-18.104.22.168 in the Trusted Zone, but that doesn't seem to help.) I am wondering if it might be safe enough to rely on the Dlink router as a firewall, and run these machines without software firewalls? And if you think so, could you point me to a tutorial on setting up the router - here is one link I've seen, but I have never had to deal with this kind of thing before, so wanted to check with your collective experience! http://firewalling.com/dlink/dsl-504-firewall.htm Thanks.