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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
Definition
Server Address
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
Selected Servers
Adds a new server to the list, or removes one when, for example, when you need to
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
Definition
Network Address
Type the network address of the route.
Mask
Specifies how many hosts are on your network, for example, 255.255.255.0.
Gateway
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.
Metric
Specifies the preference given to the route. A low number indicates a high
preference for that route.
New 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.
Enable dynamic
routing
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
Overview of System features
Setup Wizard
McAfee Email and Web Security Appliances 5.6.0 Product Guide
307
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