What firmware version should I use on my ZyXEL Prestige 643 ADSL Router to support multiple IP addresses?
If you want to change your IP configuration for your Business DSL line to multiple IP addresses, you may need to upgrade the firmware on your router. If your firmware is anything other than Version: V2.50(AY.3) 9/23/2002 or V2.50(AY.5) 3/11/2003, you will need to upgrade prior to changing your IP configuration.