computer hardware, electronic components, consumer electronics  
A firewall is a combination of hardware and software that intercepts data and thereby restricts access between a protected network and outside networks such as the Internet. Firewalls shield data and resources from the potential ravages of computer network intruders. Firewalls typically use some combination of two techniques affording network protection: packet filtering and proxy services. Packet filtering is the action a firewall takes to selectively control the flow of data to and from a network. Packet filters allow or block packets, usually while routing them from one network to another. A packet filter examines all incoming and outgoing data packets and, based on pre-defined filtering rules, determines which packets will be allowed to pass. Filtering rules can be based on one or more factors, including type of packet, source and destination IP address, port number, etc. A proxy is a program, running on an intermediate system, that deals with servers on behalf of clients. An application proxy operates at the upper levels of the protocol stack such as the application layer and presentation layer and provides proxy services on external networks for protected internal clients. The role of an application proxy is to communicate with external services on behalf of a client. While application proxies are more secure than packet filters, they are also much slower.

Listings on Computers : Networking devices : Firewalls

  • WatchGuard Technologies, Inc.
    Provides network security. The company's Firebox X family of upgradeable appliances delivers the performance, functionality and security strength to meet the needs of organizations of any size. USA.
  • BorderWare Technologies Inc.
    Provider of messaging security solutions for enterprises and government. Products include mail firewall, session initiation protocol (SIP) firewall, VPN firewall appliance, and firewall server. USA.
  • Cepoint Networks, LLC
    Manufactures high performance, industrial strength computing systems, enterprise storage raid, network communication systems, applied computing products, and technologies for scientific applications and industrial processes. Products include raid system, raid servers, workstations and nodes, homeland security appliances, and radar acquisition systems.
  • Fortinet Inc.
    Specializes in ASIC-accelerated multi-threat security systems, antivirus firewalls for large enterprises and service providers, telecommuters, SOHOs, and small/medium-sized businesses.
  • HotBrick Corporation
    Developer of integrated network security solutions that offers security, performance and total cost of ownership required by small and medium businesses. Products include SoHo firewall, VPN firewall, personal firewall, and switches.
  • Imperva Inc.
    Provides data security, data assurance, and regulatory compliance solutions for sensitive and proprietary data in corporate data centers. Products include web application firewall, database security gateway, and management server.
  • Intertex Data AB
    Specializes in broadband access products for the small office, home office or the advanced home user. Products include featured ADSL modems and firewalls prepared for SIP-based IP telephony, presence, instant messaging and video conferencing. Sweden.
    Manufacturer of U.T.M. appliances including firewall/VPN functions, intrusion prevention, URL filtering, antivirus, antispam and antispyware for the effective protection of small, midsized and large enterprises, service providers and remote users (real-time intrusion prevention, network and application firewall, advanced content filtering, embedded KASPERSKY antivirus, antispam, antispyware, URL filtering, IPSEC and SSL VPN and bandwidth management).
  • SonicWALL, Inc.
    Designs, develops, and manufactures comprehensive Internet security solutions to protect networks and to provide secure remote access connectivity, including multi-service security gateway, real-time unified threat management firewall appliance, and platform for complex networks. USA.
  • Symantec Corporation
    Specializes in providing solutions to help individuals and enterprises assure the security, availability, and integrity of their information. Products include Norton personal firewall, Symantec enterprise firewall, Symantec hosted mail security, intruder alert, etc.

Lamps, light bulbs, lighting fixtures

2009 Electronics manufacturers directory • (Firewalls section) • Site map