If you’re building or installing a firewall to protect your computer and your data, basic information about Internet configurations can come in very handy. The following tables give you the facts on IP protocols, ports, and address ranges.
| Protocol | Name |
|---|---|
| 1 | ICMP (ping) |
| 6 | TCP |
| 17 | UDP |
| 47 | GRE (PPTP) |
| 50 | ESP (IPSec) |
| 51 | AH (IPSec) |
| Protocol | Port | Name |
|---|---|---|
| TCP | 20 | FTP data |
| TCP | 21 | FTP control |
| TCP | 23 | Telnet |
| TCP | 25 | SMTP (E-mail) |
| TCP/UDP | 53 | DNS query |
| UDP | 67/68 | DHCP (Dynamic IP address configuration) |
| TCP | 80 | HTTP (Web) |
| TCP | 110 | POP3 (E-mail) |
| TCP | 119 | NNTP (Newsgroups) |
| TCP | 143 | IMAP4 (E-mail) |
| TCP | 389 | LDAP (Directory service) |
| TCP | 443 | HTTPS (Web SSL) |
| UDP | 1701 | L2TP (Virtual Private Networks) |
| TCP | 1723 | PPTP (Virtual Private Networks) |
| A | 10.0.0.0 to 10.255.255.255 (10.0.0.0/8) |
| B | 172.16.0.0 to 172.31.255.255 (172.16.0.0/12) |
| C | 192.168.0.0 to 192.168.255.255 (192.168.0.0/16) |
| APIPA | 169.254.0.0 to 169.254.255.255 (169.254.0.0/16) |
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Source:http://www.dummies.com/how-to/content/ports-protocols-and-ip-address-ranges-for-firewall.navId-323648.html
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