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Port 1646 Details

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Port(s) Protocol Service Details Source
1646 udp RADIUS RADIUS (Remote Authentication Dial-In User Service, RFC 2865 and RFC 2866 ) is a freely available distributed security system developed by Lucent Technologies InterNetworking Systems. Lucent has worked with the IETF (Internet Engineering Task Force) to define RADIUS as an interoperable method for distributed security on the Internet. RADIUS was designed based on a previous recommendation from the IETF's Network Access Server Working Requirements Group.

Uses UDP ports 1645 & 1646, or 1812 & 1813.
1646 tcp,udp radacct, RADIUS accounting protocol (default for Cisco and Juniper Networks RADIUS servers) (unofficial) Wikipedia
1646 tcp,udp sa-msg-port sa-msg-port IANA
1646 udp radacct radius accounting SANS
1646 udp radacct radius accounting Nmap
1646 udp Remote Authentication Dial In User Service (RADIUS) RADIUS accounting consists of an accounting server and accounting clients (Lucent (formerly Livingston Enterprises)PortMaster products). RADIUS accounting starts automatically when the RADIUS server starts. On a UNIX host, the radiusd accounting daemon is a child process of the radiusd authentication daemon. The RADIUS accounting server uses the User Datagram Protocol (UDP), and listens for UDP packets at port 1646 by default. Bekkoame
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Related ports: 1645  1812  1813  

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External Resources
SANS Internet Storm Center: port 1646

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.

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