24 CHAPTER 1: P RE-I NSTALLATIONFigure 3 Dual Network Configuration — Two Server PairsUMS Intelligent Mirroring uses both eth0 and eth1 network interfacecards on the Primary and Secondary UMS servers. The VCX Call Processorand SIPDownloader use eth1 and the auth, acct, bss, and dir servers useeth0 on the Primary and Secondary VCX servers.Gathering SiteInformationThe VCX V7000 hardware servers communicate with each other using IPaddresses. These addresses must be dedicated (static) and must becompatible with your network design.A VCX system is composed of one pair or two pairs of servers. The nextsections describe the information you need to gather or decide for eachof these systems.Using DNS 3Com recommends that you configure your DNS servers so that theyknow the IP addresses of all VCX servers and gateways.3Com does not support NIS or WINS as domain name resolution methodsfor VCX products.Network BNetwork APrimary SecondaryUMS Server UMS ServerPrimaryVCX ServerSecondaryVCX Servereth0eth1eth0eth1eth0eth1eth0eth1
