Nat - ATCOM AT-620 User Manual

AT-620 User Manual
DNS Relay: Select DNS Relay, the default is enable. Click the Apply button to
become effective.
DHCP Lease Table: Shows the DHCP Lease Table， the unit of Lease time is
Minute.
Notice:
1）The size of lease table cannot be larger than the quantity of C network IP
address. We recommend you to use the default lease table and not modify it.
2）If you modifies the DHCP lease table, you need save the configuration and
reboot.

NAT

4.2.
NAT is abbreviated from Net Address Translation; it's a protocol responsible for
IP address translation. In other word, it is responsible for transforming IP and
port of private network to public, also is the IP address mapping which we
usually say.
DMZ config：
In order to make some intranet equipments support better service for extranet,
and make internal network security more effectively, these equipments open to
extranet need be separated from the other equipments not open to extranet by
the corresponding isolation method according to different demands. We can
provide the different security level protection in terms of the different resources
by building a DMZ region which can provide the network level protection for the
equipments environment, reduce the risk which is caused by providing service
to distrust customer, and is the best position to put public information The
following chart describes the network access control of DMZ.
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