Chapter 13 NAT
ZyWALL USG Series User’s Guide
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• Well-known ports range from 0 to 1023.
• Registered ports range from 1024 to 49151.
• Dynamic ports (also called private ports) range from 49152 to 65535.
13.2 The NAT Screen
The NAT summary screen provides a summary of all NAT rules and their configuration. In addition, this
screen allows you to create new NAT rules and edit and delete existing NAT rules. To access this screen,
Table 153 Well-known Ports
PORT TCP/UDP DESCRIPTION
1 TCP TCP Port Service Multiplexer (TCPMUX)
20 TCP FTP- Data
21 TCP FTP - Control
22 TCP SSH Remote Login Protocol
23 TCP Telnet
25 TCP Simple Mail Transfer Protocol (SMTP)
42 UDP Host Name Server (Nameserv)
43 TCP WhoIs
53 TCP/UDP Domain Name System (DNS)
67 UDP BOOTP/DHCP server
68 UDP BOOTP/DHCP client
69 UDP Trivial File Transfer Protocol (TFTP)
79 TCP Finger
80 TCP HTTP
110 TCP POP3
119 TCP Newsgroup (NNTP)
123 UDP Network Time Protocol (NTP)
135 TCP/UDP RPC Locator service
137 TCP/UDP NetBIOS Name Service
138 UDP NetBIOS Datagram Service
139 TCP NetBIOS Datagram Service
143 TCP Interim Mail Access Protocol (IMAP)
161 UDP SNMP
179 TCP Border Gateway Protocol (BGP)
389 TCP/UDP Lightweight Directory Access Protocol (LDAP)
443 TCP HTTPS
445 TCP Microsoft - DS
636 TCP LDAP over TLS/SSL (LDAPS)
953 TCP BIND DNS
990 TCP FTP over TLS/SSL (FTPS)
995 TCP POP3 over TLS/SSL (POP3S)
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