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Firewall Plugin

The Firewall Plugin provides a flexible and secure connection between your private network and the Internet. It prevents unauthorized access to your private network, while providing controlled access to Internet to users within your network.

SERVICES

While Network Address Translation allow users transparent access to virtually any Internet service, including FTP, Telnet, World Wide Web (Web), E-Mail (SMTP, POP3 and IMAP), Internet Relay chat (IRC) and many many others, the Firewall Plugin complements it with rule-based filtering, firewall policy based protection, address and port redirection, comprehensive logging and traffic accounting.

SECURITY

Security is enforced at several levels. IP traffic is continuously monitored by the Firewall Plugin. As a network packet enters the firewall, its is scanned at every level of the protocol stack before it is allowed onto or out of the network that is being protected. This full inspection guarantees the security of the network.

Each packet can be checked for every little detail that the system administrator considers important:

  • Incoming and/or outgoing packet
  • Type of service (TCP/UDP/ICMP/etc.)
  • Source and destination IP addresses
  • Source and destination IP services (ports)
  • Any combination of bits in the header (ACK/SYN/FIN/etc.)
  • Byte pattern at given offset of packet content
  • Byte pattern search in packet

For every matched packet/connection, the system administrator can choose an appropriate action:

  • Allow packet/connection
  • Deny packet/connection
  • Log packet/connection into separate or common log file
  • Execute external application
  • Give audio-alert
  • Include packet in the traffic accounting

PORT AND ADDRESS REDIRECTION

The firewall's Access Control rules provide the capability of redirection, which allows a connection request from an external client to be remapped to a system on the internal network. Redirection can be applied to both IP addresses and ports, and allows the destination address to be changed from the external address of the firewall to specific hosts behind the internal network. Port and address Redirection is extremely useful in providing access to servers on the internal network that are otherwise not accessible to the outside world.


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