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Help > Self Help > Broadband ADSL > Broadband Networking Guide - Setting up a ZyXEL Prestige 600 ADSL Router

Broadband Networking Guide - Setting up a ZyXEL Prestige 600 ADSL Router

With a single public IP address (NAT service)

With a public IP-range subnet (No-NAT service)

ZyXEL Prestige 600 series

Connecting with the ZyXEL Prestige 600 router proved to be an absolute doddle despite the less-than-helpful instructions.  Unlike the D-LINK, the ZxXEL router does not have a web browser interface, instead relying on bespoke software. The leaflet accompanying this piece of equipment stated quite clearly that the enclosed Windows software (CD supplied) was 'not recommended' and that Telnet or console connection should be used instead.  We of course used Telnet which is by far the quickest and easiest way of setting up this particular router.

As with the D-LINK, the default settings of this router are DHCL active, although unlike the D-LINK, ZyXEL have chosen as the internal network., therefore, is the IP address you Telnet to. Of course in order to communicate from our PC with the router we'll need to make sure we're on the same network. 

The first thing you'll need to make sure of is that your PC is obtaining its IP address from the router via DHCP.  Time to check the TCP/IP settings on your PC.  The following screenshot is from a Windows 2000 machine but most OS's are somewhat similar.   Make sure that the TCP/IP stack assigned to your network adaptor is set to obtain its IP address (and DNS) automatically.

You can check to see what IP address your PC has been assigned by going to a command line prompt (DOS) and typing ipconfig on Windows 2000/XP or winipcfg on Win98.

If you need to release an existing IP address from your stack you should type:
ipconfig /release  followed by ipconfig /renew

This will give your PC a new IP from the DHC server running on your router.

Obtain IP address automatically

Make sure you select your Network Interface Card (NIC) from the drop-down menu.   On Win98 you'll need to click on the 'Release All' button, followed by 'Renew' and then reboot your machine. You can see how we've been assigned the second IP of the internal network

Renew your IP address

Now that our Windows box can see the router we can Telnet to it.

From a command line (DOS) prompt type:


The following screen will appear, prompting you for a password. Don't bother looking for this on the enclosed leaflet it's not there. It may be on the CD but we didn't look, we used Google to find out that it's '1234' by default.

Telnet session established

After logging in successfully you're presented with the following administration menu.  It's a numerical menuing system that's hardly state-of-the-art but what this router lacks in beauty it more than makes up for in responsiveness and admin features.

The main configuration menu for the ZyXEL Prestige router

In this guide we're only looking at the two interfaces, external connectivity and the internal network.  First the Ethernet Setup section.  To get here you click '3' and 'Return'.

Ethernet (LAN) setup

Type '2' (TCP/IP and DHCP Settings) and you can set up which IP's the router should assign to machines on your internal network.

DHCP can be set to 'Server', 'Relay' or 'None'.  Here we've set it to 'Server' and it's issuing IP's on the range to

Again it's important that the gateway address be on the same network as the IP's you are issuing.  You may wish to change this to use network for example. If you're not sure about how to set this up you should ask a colleague or use the support forums for assistance. Please remember that configuring your internal network is your responsibility and our support advisors will not be able to assist you with this.

Primary and secondary DNS server addresses may be specified here (check the Server Information of the Technical Support section of the Portal for the IP's specific to your service) but we found that the router discovered these settings automatically upon connection.  'Enter' to confirm.

Configuring TCP/IP and DHCP

Back to the main menu and type '4' for the Internet Access Menu.  Here we set the username and password for your account, together with those technical settings without which your PPP session couldn't be established across BT's ATM network.

Encapsulation = PPP (note that the ZyXEL doesn't specify ATM)

Multiplexing = VC

VPI = 0  & VCI=38

Your IP assignment is dynamic

Internet access setup

Make sure you see that 'Saving to ROM' flashes up when you 'Enter to confirm' your settings and from the main menu type '99' to exit.  You're now ready to surf from your LAN.

We liked both these routers for their ease of setup.  Choosing the NAT option for running your internal network cannot be recommended highly enough in our opinion.  Unless you really need to use additional equipment to run DHCP and you need a server with a public IP address we'd say choose the easy route and go for Single IP NAT.

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Setting up a network with a public IP-range subnet (No-NAT service)

ZyXEL Prestige 600 series

Making sure that your server is currently set to obtain its IP address automatically and that we are on the same network as the router (as described previously), we need to Telnet to its default IP address of (unless, of course, you have changed it!).  Type in your password ('1234' by default), and we can get to business.

The more observant amongst you might spot that the screenshot below was taken after the configuration we are about to describe had taken place!

Login to the ZyXEL router

From the main menu choose option '3' to enter the configuration of your internal 'gateway' or 'Ethernet' address.

ZyXEL Prestige main menu

From the Ethernet menu we select '2', the TCP/IP and DHCP settings area.

Ethernet setup

In the Ethernet settings we need to turn off the DHCP server (toggle it to 'None') and set the IP Address to your router's assigned connection IP (in our example it's  Make sure that you specify the subnet mask correctly.

Turn off DHCP and set your Ethernet address to that of your router

Press 'Enter' to confirm your settings.  You should see that your router saves the new configuration to ROM.  Returning once more to the main screen we should select '4' -Internet Access Setup.  This is where you would specify your username and password, along with the PPP information and VPI/VCI settings.

Internet Access Settings

Save your configuration.  Now the router is set up, the network has been changed and DHCP is disabled, we need to manually configure the TCP/IP stack of your router so that it's on the same network.  Back to the Control Panel then and the properties of the TCP/IP that's bound to the Network Interface Card.

Configure your NIC's TCP/IP stack

Select the TCP/IP for your network card and click on 'Properties'.  We now want to manually specify an IP address for the server rather than have it obtain its IP address automatically.  In our example we're using which is the valid available IP address that we can use on our given subnet.

Specify your IP address

We need to configure DNS for this connection.  Click on the appropriate tab.  The first DNS entry should be the IP address of your router since it will be quickest to obtain from there.  The second DNS server IP address would generally be set to the primary DNS server of your ISP.

Setup DNS entries for your connection

Your Gateway address should be set also as the IP address of your router.

Set your default gateway address as your router

We found setting up the ZyXEL router to be exceptionally quick and stress free when configuring the noNAT setup.  The D-LINK seemed somewhat sluggish in comparison and seemed to require more reboots that the ZyXEL.  Having said that, running the D-LINK with a NAT connection was superb and this router does offer a great built-in firewall.

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