ZyXEL Communications ISG50 User Manual

Chapter 52 System

ISG50 User’s Guide

The following table describes the labels in this screen.  

Simple Network Management Protocol is a protocol used for exchanging management information 
between network devices. Your ISG50 supports SNMP agent functionality, which allows a manager 
station to manage and monitor the ISG50 through the network. The ISG50 supports SNMP version 

Configuration > System > FTP

Enable

Select the check box to allow or disallow the computer with the IP address that 
matches the IP address(es) in the Service Control table to access the ISG50 
using this service.

TLS required

Select the check box to use FTP over TLS (Transport Layer Security) to encrypt 
communication.

This implements TLS as a security mechanism to secure FTP clients and/or 
servers.

Server Port

You may change the server port number for a service if needed, however you 
must use the same port number in order to use that service for remote 
management.

Server 
Certificate

Select the certificate whose corresponding private key is to be used to identify the 
ISG50 for FTP connections. You must have certificates already configured in the 
My Certificates screen (Click My Certificates and see 

 

for details).

Service Control

This specifies from which computers you can access which ISG50 zones.

Add

Click this to create a new entry. Select an entry and click Add to create a new 
entry after the selected entry. Refer to 

 for details on the 

screen that opens.

Edit

Double-click an entry or select it and click Edit to be able to modify the entry’s 
settings. 

Remove

To remove an entry, select it and click Remove. The ISG50 confirms you want to 
remove it before doing so. Note that subsequent entries move up by one when 
you take this action.

Move

To change an entry’s position in the numbered list, select the method and click 
Move to display a field to type a number for where you want to put it and press 
[ENTER] to move the rule to the number that you typed.

#

This the index number of the service control rule.

The entry with a hyphen (-) instead of a number is the ISG50’s (non-configurable) 
default policy. The ISG50 applies this to traffic that does not match any other 
configured rule. It is not an editable rule. To apply other behavior, configure a rule 
that traffic will match so the ISG50 will not have to use the default policy.

Zone

This is the zone on the ISG50 the user is allowed or denied to access.

Address

This is the object name of the IP address(es) with which the computer is allowed 
or denied to access.

Action

This displays whether the computer with the IP address specified above can 
access the ISG50 zone(s) configured in the Zone field (Accept) or not (Deny).

Apply

Click Apply to save your changes back to the ISG50. 

Reset

Click Reset to return the screen to its last-saved settings.