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Cisco Pix

Cisco PIX (Private Internet eXchange) is one of the most popular IP firewalls and network address translation (NAT) appliances.

The PIX is a firewall appliance based on a hardened, specially built operating system, PIX OS, minimizing possible OS-specific security holes.

The PIX runs a custom-written proprietary operating system originally called Finesse (Fast InterNEt Server Executive), but now the software is known simply as PIX OS. It is classified as a network layer firewall with stateful inspection, although technically the PIX would more precisely be called a Layer 4, or Transport Layer Firewall, as its access is not restricted to Network Layer routing, but socket based connections (a port and an IP Address – Port communications occur at Layer 4).

PIX firewalls provide a wide range of security and networking services including:

  • Network Address Translation (NAT) or Port Address Translation (PAT)
  • content filtering (Java/ActiveX)
  • URL filtering
  • IPsec VPN
  • support for leading X.509 PKI solutions
  • DHCP client/server
  • PPPoE support
  • advanced security services for multimedia applications and protocols including Voice over IP (VoIP), H.323, SIP, Skinny and Microsoft NetMeeting
  • AAA (RADIUS/TACACS+) integration
Cisco Pix
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About Joe

Senior Network Engineer, technology enthusiast, guitar and bass player. Joe Wilson is the creator of RouterFreak.com as well as other niche websites that can be found around on the Internets.

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