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Official port is 1812. TCP port 1645 must not be used for RADIUS. [150] 1646: No: Unofficial: Old radacct port, [when?] RADIUS accounting protocol. Enabled for compatibility reasons by default on Cisco [citation needed] and Juniper Networks RADIUS servers. [149] Official port is 1813. TCP port 1646 must not be used for RADIUS. [150] 1666 ...
When an outbound connection from a private endpoint passes through a firewall, it receives a public endpoint (public IP address and port number), and the firewall translates traffic between them. Until the connection is closed, the client and server communicate through the public endpoint, and the firewall directs traffic appropriately.
So when two peers, A and B, initiate TCP connections by binding to local ports Pa and Pb, respectively, they need to know the remote endpoint port as mapped by the NAT to make the connection. When both peers are behind a NAT, how to discover the public remote endpoint of the other peer is a problem called NAT port prediction .
In computer networking, a port or port number is a number assigned to uniquely identify a connection endpoint and to direct data to a specific service. At the software level, within an operating system , a port is a logical construct that identifies a specific process or a type of network service .
If the network in question is the Internet or an intranet, many physical network nodes are host computers, also known as Internet nodes, identified by an IP address, and all hosts are physical network nodes. However, some data-link-layer devices such as switches, bridges and wireless access points do not have an IP host address (except ...
Network sockets may be dedicated for persistent connections for communication between two nodes, or they may participate in connectionless and multicast communications. In practice, due to the proliferation of the TCP/IP protocols in use on the Internet, the term network socket usually refers to use with the Internet Protocol (IP).
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.
In SNCF, the node attaches its own address and sequence number to the packet, since every node has a memory of addresses and sequence numbers. If it receives a packet in memory, it drops it immediately while in RPF, the node will only send the packet forward. If it is received from the next node, it sends it back to the sender.