As we know, port 161/162/1993 could be TCP or UDP and snmp traps are sent out in UDP. Could you please tell me when TCP 161/162/1993 will be used and how to identify it is TCP or UDP on a Cisco router? Thanks very much!
As I know UDP 161/162 are used for SNMP. On my network a monitor only these two ports concerning the SNMP. If you want to verify if it is udp or tcp you can do it very easily with an access list. For example:
access-list 166 permit icmp any any echo
access-list 166 permit icmp any any echo-reply
access-list 166 permit udp any any log
access-list 166 permit tcp x.x.x.x x.x.x.x any log
access-list 166 permit tcp any x.x.x.x x.x.x.x log
access-list 166 permit ip any x.x.x.x x.x.x.x
access-list 166 permit ip any any
You can even simplyfy this list by using any any for the tcp and fot the ip part.
This way you won't affect your regular communication and you'll be able to view the log messages on the console or terminal.
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