Cisco ASA Series User Manual

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Cisco ASA Series CLI Configuration Guide
Appendix 1 Addresses, Protocols, and Ports
Local Ports and Protocols
Local Ports and Protocols
Table 1-8 lists the protocols, TCP ports, and UDP ports that the ASA may open to process traffic destined
to the ASA. Unless you enable the features and services listed in Table 1-8, the ASA does not open any
local protocols or any TCP or UDP ports. You must configure a feature or service for the ASA to open
the default listening protocol or port. In many cases you can configure ports other than the default port
when you enable a feature or service.
tacacs TCP, UDP 49 Terminal Access Controller Access Control System
Plus
talk TCP, UDP 517 Talk
telnet TCP 23 RFC 854 Telnet
tftp UDP 69 Trivial File Transfer Protocol
time UDP 37 Time
uucp TCP 540 UNIX-to-UNIX Copy Program
who UDP 513 Who
whois TCP 43 Who Is
www TCP 80 World Wide Web
xdmcp UDP 177 X Display Manager Control Protocol
Table 1-7 Port Literal Values (continued)
Literal
TCP or
UDP? Value Description
Table 1-8 Protocols and Ports Opened by Features and Services
Feature or Service Protocol Port Number Comments
DHCP UDP 67,68 —
Failover Control 105 N/A —
HTTP TCP 80 —
HTTPS TCP 443 —
ICMP 1 N/A —
IGMP 2 N/A Protocol only open on destination IP
address 224.0.0.1
ISAKMP/IKE UDP 500 Configurable.
IPsec (ESP) 50 N/A —
IPsec over UDP
(NAT-T)
UDP 4500 —
IPsec over UDP
(Cisco VPN 3000
Series compatible)
UDP 10000 Configurable.

Cisco ASA Series Specifications

General

Brand	Cisco
Model	ASA Series
Category	Network Hardware
Language	English