Motorola NVG510, Руководство администратора

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Administrator’s Handbook
48
Firewall
When you click the
Firewall
tab, the
Firewall
Status page appears. The Firewall page displays the status of your
system firewall elements.
All computer operating systems are vulnerable to attack from outside sources, typically at the operating system or
Internet Protocol (IP) layers. Stateful Inspection firewalls intercept and analyze incoming data packets to deter-
mine whether they should be admitted to your private LAN, based on multiple criteria, or blocked. Stateful inspec-
tion improves security by tracking data packets over a period of time, examining incoming and outgoing packets.
Outgoing packets that request specific types of incoming packets are tracked; only those incoming packets consti-
tuting a proper response are allowed through the firewall.
Stateful inspection is a security feature that prevents unsolicited inbound access when NAT is disabled. You can
configure UDP and TCP “no-activity” periods that will also apply to NAT time-outs if stateful inspection is enabled
on the interface. Stateful Inspection parameters are active on a WAN interface only if enabled on your system.
Stateful inspection can be enabled on a WAN interface whether NAT is enabled or not.
The center section displays the following:
The links at the top of the Firewall page access a series of pages to allow you to configure security features of
your device. The following sections give brief descriptions of these pages.
◆ “Packet Filter” on page 49
◆ “NAT/Gaming” on page 53
◆ “IP Passthrough” on page 58
◆ “Firewall Advanced” on page 60
Packet Filter
May be On or Off
IP Passthrough
May be On or Off
NAT Default Server
May be On or Off
Firewall Advanced
May be On or Off