Jacobson, The bsd packet filter
: A new architecture for user-level packet capture, in Proceedings of the USENIX Winter 1993 Conference Proceedings on USENIX Winter 1993 Conference Proceedings.
We modified our polling kernel to implement queue-state feedback (see Section 6.4) from the packet filter
The remote firewall consists of three major components; the packet filter
, the remote firewall agent, and the remote firewall client agent.
Rather than allowing information from the outside to get sifted through a packet filter
and forwarded into the private network, a system administrator can set up an application gateway, called a proxy server firewall, to prevent the two networks from having any direct contact.
Moreover, the bastion host can, if desired, act as a proxy server for services that need to be made more secure, with the router serving as a packet filter
to control access to internal networks.
In addition, elmeg T484 features packet filter
firewall, which provides protection against external attacks with preconfigured profiles to protect against the most frequent threats.