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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).
Integrating Pi-hole with a VPN allows users to extend ad-blocking and tracker-blocking capabilities to devices outside their local network, providing consistent protection while on the go. This setup ensures privacy and security even on untrusted or public networks by funneling traffic through a secure connection.
a single port could in some case be sufficient (e.g. in the case of a simple service consumer); typically, there are ports for event sources (user interface, automatic feeding), notifications (outgoing notifications), database (in order to interface the component with any suitable DBMS), and administration (for controlling the component);
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.
By default a service is exposed inside a cluster (e.g., back end pods might be grouped into a service, with requests from the front-end pods load-balanced among them), but a service can also be exposed outside a cluster (e.g., for clients to reach front-end pods).
OpenSAF is commonly used as a way to achieve carrier-grade (five-nines) service availability. OpenSAF is functionally complete but lacks the ecosystem of modeling tools available to other open-source solutions like Kubernetes and Docker Swarm.
The TCP Port Service Multiplexer (TCPMUX) is a little-used Internet protocol defined in RFC 1078. The specification describes a multiplexing service that may be accessed with a network protocol to contact any one of a number of available TCP services of a host on a single, well-known port number .
Port triggering is a configuration option on a NAT-enabled router that controls communication between internal and external host machines in an IP network. It is similar to port forwarding in that it enables incoming traffic to be forwarded to a specific internal host machine, although the forwarded port is not open permanently and the target internal host machine is chosen dynamically.