ZyXEL Communications 70 Series User Manual

ZyWALL 5/35/70 Series User’s Guide

Chapter 1 Getting to Know Your ZyWALL

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The ZyWALL allows you to get the current time and date from an external server when you 
turn on your ZyWALL. You can also set the time manually. The Real Time Chip (RTC) keeps 
track of the time and date. 

Use the reset button to restore the factory default password to 1234; IP address to 192.168.1.1, 
subnet mask to 255.255.255.0 and DHCP server enabled with a pool of 32 IP addresses 
starting at 192.168.1.33. 

The dual PCMCIA and CardBus slot provides the option of a wireless LAN. You can 
alternatively insert a ZyWALL Turbo Card to use the anti-virus and IDP features.

The optional wireless LAN card provides mobility and a fast network environment for small 
and home offices. Users can connect to the local area network without any wiring efforts and 
enjoy reliable high-speed connectivity.

The ZyWALL improves quality of service and maximizes bandwidth utilization by dividing 
traffic loads between the two WAN interfaces (or ports). 

Transparent firewall is also known as a bridge firewall. The ZyWALL can act as a bridge and 
still have the capability of filtering and inspecting the packets between a router and the LAN, 
or two routers. You do not need to do any other changes to your existing network.  

The ZyWALL includes a SIP Application Layer Gateway (ALG). It allows VoIP calls to pass 
through NAT by examining and translating IP addresses embedded in the data stream. Use the 
ALG screen to enable or disable the SIP ALG.

When the ZyWALL is set to bridge mode, (R)STP detects and breaks network loops and 
provides backup links between switches, bridges or routers. It allows a bridge to interact with 
other (R)STP -compliant bridges in your network to ensure that only one path exists between 
any two stations on the network.