![]() ![]() The Port Security page ( Devices > Device Manager > bar-graph icon > TCP/UDP Ports tab) displays a list of all open ports on a device.įor SNMP and pingable devices, SL1 scans each device's TCP ports using NMAP.įor devices monitored using the SL1 Agent, the agent reports open TCP and UDP ports. Ports 1024-49151 can be registered by vendors for proprietary applications. Ports 0-1023 are used by common Internet applications such as HTTP, FTP, and SMTP. Commonly used TCP ports include port 80 for HTTP, port 25 for SMTP, and port 20 for FTP. Commonly used UDP ports include port 53 for DNS and port 161 for SNMP. UDP does not include a handshake, does not ensure packets are sent in a particular order, does not return error messages, and will not automatically try to resend or re-receive a packet TCP will do all these things. Ports can use the UDP protocol or the TCP protocol. ![]() ![]() For example, port 80 is the standard port number for HTTP traffic, and port 80 packets are processed by a Web server. Ports are like an apartment number in an apartment building the street address (IP address) gets the message to the right building, and the apartment number (port number) gets the message to the right person. Ports are used to route packets on a server to the appropriate application. ![]()
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