As a public utility, we must comply with a host of network requirements handed down by NERC. One of these is the documentation of 'open' ports on network devices. That is to say, a tcp or udp port that the device is listening on or will accept connections on. A useful command for this kind of investigation is 'show control-plane host open-ports'; the output of which is shown here:
Active internet connections (servers and established)
Prot Local Address Foreign Address Service State
tcp *:23 *:0 Telnet LISTEN
tcp *:23 126.96.36.199:59714 Telnet ESTABLIS
udp *:50162 *:0 IP SNMP LISTEN
udp *:54154 10.92.192.67:514 Syslog ESTABLIS
udp *:123 *:0 NTP LISTEN
udp *:4500 *:0 ISAKMP LISTEN
udp *:161 *:0 IP SNMP LISTEN
udp *:162 *:0 IP SNMP LISTEN
udp *:1975 *:0 IPC LISTEN
udp *:500 *:0 ISAKMP LISTEN
It is my understanding that enabling SNMP management of the device will result in the line above with port 50162. However, this is a random high port that is different on every device tested - see below for other examples:
udp *:54006 *:0 IP SNMP LISTEN
udp *:52786 *:0 IP SNMP LISTEN
I am hoping to find out what the defind range for these ports might be so that we can document appropriately?
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