D-Link DSL-524T User Manual page 40

Primary DNS
Address
Secondary DNS
Address
MTU
NAT
Firewall
Click Apply to set the Static IP address for the DSL-524T.
DSL-524T ADSL Router Manual
This entry is for the IP address of your primary domain name server, which should
also be provided to you by your ISP. The router will first try the Primary DNS
Address to resolve a website's URL IP address. If this IP address fails, the router
will then try the Secondary DNS Address.
The IP address of the secondary domain name server will be used to resolve a
website's URL IP address if the Primary DNS Address fails. The information in this
field should also be provided by your ISP.
The Maximum Transmission Unit (MTU) is a link layer restriction on the maximum
number of bytes of data in a single transmission. The default size is 1400 bytes per
packet.
NAT improves network security in effect by hiding the private network behind one
global and visible IP address. NAT address mapping can also be used to link two IP
domains via a LAN-to-LAN connection. Use the pull-down menu to Enable or Disable
NAT on the Router.
The Firewall allows the Router to enforce policies to protect against certain kinds of
attacks. To enable the firewall on the Router, use the pull-down menu and select
Enabled.
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