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 |