ZyXEL Communications ISG50 User Manual

 Chapter 12 Interfaces

ISG50 User’s Guide

Check Fail 

Tolerance

Enter the number of consecutive failures before the ISG50 stops routing through the 
gateway.

Check Default 

Gateway

Select this to use the default gateway for the connectivity check.

Check this 

address

Select this to specify a domain name or IP address for the connectivity check. Enter 
that domain name or IP address in the field next to it.

Check Port

This field only displays when you set the Check Method to tcp. Specify the port 
number to use for a TCP connectivity check.

Related Setting

Configure WAN 

TRUNK 

Click WAN TRUNK to go to a screen where you can configure the interface as part of a 
WAN trunk for load balancing.

Configure Policy 

Route

Click Policy Route to go to the policy route summary screen where you can configure a 
policy route to override the default routing and SNAT behavior for the interface.

IP Address 
Assignment

Get 

Automatically 

Select this option If your ISP did not assign you a fixed IP address. This is the default 
selection. 

Use Fixed IP 

Address

Select this option If the ISP assigned a fixed IP address. 

IP Address 

Assignment

Enter the cellular interface’s WAN IP address in this field if you selected Use Fixed IP 
Address. 

Metric

Enter the priority of the gateway (if any) on this interface. The ISG50 decides which 
gateway to use based on this priority. The lower the number, the higher the priority. If 
two or more gateways have the same priority, the ISG50 uses the one that was 
configured first.

Device Settings

Device Selection

Select the 3G card to use with this entry or select auto to have the ISG50 automatically 
detect the type of card.

Band Selection

This field appears if you selected a 3G device that allows you to select the type of 
network to use. Select the type of 3G service for your 3G connection. If you are unsure 
what to select, check with your 3G service provider to find the 3G service available to 
you in your region.

Select auto to have the card connect to an available network. Choose this option if you 
do not know what networks are available.

You may want to manually specify the type of network to use if you are charged 
differently for different types of network or you only have one type of network available 
to you.

Select GPRS / EDGE (GSM) only to have this interface only use a 2.5G or 2.75G 
network (respectively). If you only have a GSM network available to you, you may want 
to select this so the ISG50 does not spend time looking for a WCDMA network.

Select UMTS / HSDPA (WCDMA) only to have this interface only use a 3G or 3.5G 
network (respectively). You may want to do this if you want to make sure the  interface 
does not use the GSM network.

Configuration > Network > Interface > Cellular > Add (continued)