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Used Cisco Pix Firewalls - Cisco Firewalls

Network Liquidators is the premier online destination for buying and selling used Cisco PIX Firewalls equipment.

We keep an extensive inventory of new and used Cisco PIX Firewalls  in stock at most times which are usually available for overnight delivery. Along with the Cisco PIX Firewalls , we also carry many other accessories.

All of our used Cisco PIX Firewalls  go through a grueling inspection, testing and refurbishing process and all of our Cisco PIX Firewalls equipment comes standard with our Lifetime Warranty (end-user customers only). For details about our inspection, testing and refurbishing process, click here.

If you cannot find the exact Cisco PIX Firewalls equipment you are looking for, please call one of our account executives at 1-800-998-9862 for a custom quote. if you are not sure what you need, we have technicians on staff experienced with Cisco PIX Firewalls products that can help you with your configurations.

We both buy and sell used Cisco PIX Firewalls  and other Cisco PIX Firewalls accessories. Let us know if you have any surplus Cisco PIX Firewalls equipment that you are looking to sell and we will immediately reply with fair market value. Please call our purchasing department at 1-800-998-9862.

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Used Cisco Firewalls

Used Cisco PIX Firewalls
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All Used Cisco PIX Firewall Equipment

Used Cisco Firewall Memory

Used Cisco PIX-515-MEM-32 Firewall Memory

Used Cisco PIX-515-MEM-128 Firewall Memory

What are Firewalls?

A firewall is a system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

Firewall Techniques:

Packet filter:
Looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.

Application gateway:
Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation.

Circuit-level gateway:
Applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.

Proxy server: Intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.

Used Cisco Firewalls

Used Cisco PIX-515 Firewall
Used Cisco PIX-515-R-BUN Firewall
Used Cisco PIX-515E Firewall

Used Cisco PIX-520 Firewall
Used Cisco PIX-520-FO-BUN Firewall

Used Cisco Firewall Interface Cards

Used Cisco PIX-4FE-66 Interface Card

Used Cisco PIX-1GE-66 Interface Card

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