ACL

Extended Access Control List (ACL) – TCP and UDP Port Numbers and Names

Using Extended Access Control List, we can filter traffic based on TCP or UDP port numbers or port names. Click the following link to know important TCP port numbers.

You can specify a name also for TCP or UDP port numbers.

For example, you can use the keyword smtp to match SMTP traffic (port number 25).

Common TCP Port Names

 

Port Name Keyword
FTP Data (TCP port number 20) ftp-data
FTP Control (TCP port number 21 ) ftp
Telnet (TCP port number 23) telnet
SMTP (TCP port number 25) smtp
HTTP (TCP port number 80) www

 

Common UDP Port Names

 

Port Name Keyword
DNS (UDP port number 53) dns
TFTP (UDP port number 69) tftp
SNMP (UDP port number 161) snmp
IP RIP (UDP port number 520) rip

Posted By – RamCruiseWalker

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