McAfee Email Gateway version 7.0 Appliances Installation Guide

2Installing the McAfee Email Gateway applianceUsing the Configuration ConsoleDraft only - 9.13.11Cluster Management (Cluster Failover)OptionAddress to use for loadbalancingCluster identifierEnable scanning on thisappliance (Not applicableon Content SecurityBlade Servers)DefinitionSpecifies the appliance address. Provides a list of all subnets assigned tothe appliance.If you have more than one cluster or McAfee Content Security Blade Serveron the same subnet, assign each a different Cluster identifier to ensure theclusters do not conflict.The allowable range is 0-255.If not selected, this appliance distributes all scanning workload to thescanning appliances.For a cluster of appliances, if you have only a master and a failoverappliance, with both configured to scan traffic, the master will send mostconnections to the failover appliance for scanning.DNS and Routing pageUse this page to configure the appliance's use of DNS and routes.Domain Name System (DNS) servers translate or "map" the names of network devices into IPaddresses (and the reverse operation). The appliance sends requests to DNS servers in the order thatthey are listed here.DNS server addressesTable 2-2 Option definitions — DNS ServersOptionServer AddressNew Server/ DeleteSelected ServersOnly send queriesto these serversDefinitionDisplays the IP addresses of the DNS servers. The first server in the list must beyour fastest or most reliable server. If the first server cannot resolve the request,the appliance contacts the second server. If no servers in the list can resolve therequest, the appliance forwards the request to the DNS root name servers on theInternet.If your firewall prevents DNS lookup (typically on port 53), specify the IP address ofa local device that provides name resolutionAdds a new server to the list, or removes one when, for example, when you need todecommission a server due to network changes.Selected by default. McAfee recommends that you leave this option selected becauseit might speed up DNS queries as the appliance sends the queries to the specifiedDNS servers only. If they don't know the address, they go to the root DNS serverson the Internet. When they get a reply, the appliance receives it and caches theresponse so that other servers that query that DNS server can get an answer morequickly.If you deselect this option, the appliance first tries to resolve the requests, or mightquery DNS servers outside your network.Routing settingsTable 2-3 Option definitions — RoutingOptionNetwork AddressDefinitionType the network address of the route.Mask Specifies how many hosts are on your network, for example, 255.255.255.0.GatewaySpecifies the IP address of the router used as the next hop out of the network. Theaddress 0.0.0.0 (IPv4), or :: (IPv6) means that the router has no default gateway.32 McAfee ® Email Gateway 7.0 Appliances Installation Guide