Instruction manual

Section 4 User Interface Guide Total Access 850 System Manual

PUBLIC PORT MODE

This option appears when the PROTOCOL MODE is configured with a single

protocol (such as TCP, UDP, or ICMP). Choices are

ANY PORT (default) and

SPECIFIED. The public destination port associated with this entry can be

specified to add more control over certain types of traffic. Leave this configured

ANY PORT to cover all port types.

PUBLIC PORT

This menu appears when the PUBLIC PORT MODE is set to SPECIFIED. Use this

option to specify the public port number to translate. Some well known

TCP/UDP port numbers are shown below:

Port Number Keyword Port Type

20 FTP (data) File Transfer Protocol Data

21 FTP (control) File Transfer Protocol Control

23 Telnet TCP/IP terminal emulation utility

666 DOOM DOOM

53 DNS Domain Name Server

69 TFTP Trivial File Transfer Protocol

80 HTTP Hypertext Transfer Protocol

110 POP3 Post Office Protocol ver. 3

PRIVATE ADDRESS MODE

Choose ANY INTERNAL (default) or SPECIFIED to choose which address to use for

the private address. The private IP address can be specified to filter certain

protocols and ports to specific servers in the private network. Likewise, internal

hosts can be steered to certain servers on the public network. A new request

from the public network that matches this entry’s public parameters is dropped

if the

PRIVATE ADDRESS MODE is set to ANY INTERNAL (with the exception of

protocols that the internal router is expected to respond to, such as ICMP or

SNMP).

PRIVATE ADDRESS

This menu appears when the PRIVATE ADDRESS MODE is set to SPECIFIED, and

allows the user to enter a specific private IP address for this translation. Packets

destined for the public IP address (of this translation) are redirected to the

private IP address specified here.