Chapter 13 NAT
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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)
Summary of Contents for USG110
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