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In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules are dynamically modified to allow the host which sent the connection attempts to connect over specific port(s).
The most common way a reverse connection is used is to bypass firewall and router security restrictions. [3] For example, a backdoor running on a computer behind a firewall that blocks incoming connections can easily open an outbound connection to a remote host on the Internet. Once the connection is established, the remote host can send ...
NAT traversal techniques usually bypass enterprise security policies. Enterprise security experts prefer techniques that explicitly cooperate with NAT and firewalls, allowing NAT traversal while still enabling marshalling at the NAT to enforce enterprise security policies.
Conventional firewall can only enforce a policy on traffic that traverses it, so traffic exchanged among nodes in the protected network cannot be controlled, which gives an attacker that is already an insider or can somehow bypass the firewall and establish a new, unauthorized entry point to the network without the administrator's knowledge and ...
UDP hole punching is a method for establishing bidirectional UDP connections between Internet hosts in private networks using network address translators. The technique is not applicable in all scenarios or with all types of NATs, as NAT operating characteristics are not standardized.
Barracuda Firewall Proprietary: Included Firewall Next Generation appliance Windows-based appliance embedded firewall distribution Cyberoam: Proprietary: Included Firewall Sophos appliance Windows-based appliance embedded firewall distribution D-Link: Proprietary: Included Firewall DFL Windows-based appliance embedded firewall distribution ...
Port forwarding via NAT router. In computer networking, port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall.
Split tunneling is a computer networking concept which allows a user to access dissimilar security domains like a public network (e.g., the Internet) and a local area network or wide area network at the same time, using the same or different network connections.