McAfee MAP-3300-SWG Product Guide - Page 307
DNS and Routing, Time Settings, Table 316, Option definitions - DNS Servers
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Overview of System features Setup Wizard DNS and Routing Use this page within the Custom Setup Wizard to configure the appliance's use of DNS and routes. Domain Name System (DNS) servers translate or "map" the names of network devices into IP addresses (and the reverse operation). The appliance sends requests to DNS servers in the order that they are listed here. Table 316 Option definitions - DNS Servers Option Server Address Definition Displays the IP addresses of the DNS servers. The first server in the list must be your 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 the request, the appliance forwards the request to the DNS root name servers on the Internet. If your firewall prevents DNS lookup (typically on port 53), specify the IP address of a local device that provides name resolution New Server/ Delete Adds a new server to the list, or removes one when, for example, when you need to Selected Servers decommission a server due to network changes. Only send queries to these servers Selected by default. McAfee recommends that you leave this option selected because it might speed up DNS queries as the appliance sends the queries to the specified DNS servers only. If they don't know the address, they go to the root DNS servers on the Internet. When they get a reply, the appliance receives it and caches the response so that other servers that query that DNS server can get an answer more quickly. If you deselect this option, the appliance first tries to resolve the requests, or might query DNS servers outside your network. Table 317 Option definitions - Routing Option Network Address Mask Gateway Metric New Route Enable dynamic routing Definition Type the network address of the route. Specifies how many hosts are on your network, for example, 255.255.255.0. Specifies the IP address of the router used as the next hop out of the network. The address 0.0.0.0 (IPv4), or :: (IPv6) means that the router has no default gateway. Specifies the preference given to the route. A low number indicates a high preference for that route. Add a new route to the table. Use the arrows to move the route up and down the list. The routes are chosen based on their metric value. Use this option in transparent router mode only. When enabled, the appliance can: • receive broadcast routing information received over RIP (default) that it applies its routing table so you don't have to duplicate routing information on the appliance that is already present in the network. • broadcast routing information if static routes have been configured through the user interface over RIP. Time Settings Use this page in the Custom Setup Wizard to set the time and date, and any details for the use of the Network Time Protocol (NTP). NTP synchronizes timekeeping among devices in a network. Some Internet Service Providers (ISPs) provide a timekeeping service. For more information about NTP, see RFC 1305 at www.apps.ietf.org/rfc/ rfc1305.html, www.ntp.org or www.ntp.isc.org McAfee Email and Web Security Appliances 5.6.0 Product Guide 307