Need more security

I have a Gateway P2 dual booted with Windows XP & Linux Hat 9.0. I have another custom PC dual booted with Redhat 9 and Windows ME. Now on the Custom PC I have zonealarm 4.0 pro and multiproxy as my proxy server. Now on the Linux I have the one that comes with redhat 9 set as high security.

I have 2 LINKSYS 10/100 LAN CARDS 1 installed in each system. I have a Linksys Router as well with a built in firewall. I also have COMMVIEW packet sniffer on my computer. Is there any other hardware I can purchase to make my systems more secure?

Well yes , there is a VPN firewall i think netgear makes. Check out this link

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http://www.netgear.com/products/prod...odID=155&view=

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It uses NAT like your router , SPI. And protection from DoS..
FYI: July 23 when your training starts is my birthday : - )