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DG834N RangeMax NEXT Wireless ADSL2+ Modem Router Reference Manual
Advanced Configuration 5-3
v1.0, October 2008
4. Type the IP address for that server.
5. Click Apply to save your changes.
Other WAN Options
The WAN Setup screen that is shown in Figure 5-1 also allows you perform the following tasks:
• Connecting Automatically, as Required
Usually, this option should be enabled, so that an Internet connection is made automatically,
whenever Internet-bound traffic is detected. If this causes high connection costs, you can
disable this setting.
If this setting is disabled, you must connect manually, using the screen that you access by
clicking the Connection Status button on the Status screen.
If you have an Always on connection, this setting has no effect.
• Disabling Port Scan and DOS Protection
The firewall protects your LAN against port scans and denial of service (DOS) attacks. This
protection should be disabled only in special circumstances.
• Responding to a Ping on an Internet WA Port
If you want the modem router to respond to a ping from the Internet, select the Respond to
Ping on Internet WA Port check box. This should be used only as a diagnostic tool, since it
allows your modem router to be discovered. Do not select this check box unless you have a
specific reason to do so.
• Setting the MTU Size
The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500 bytes,
or 1492 bytes for PPPoE connections. For some ISPs you might need to reduce the MTU. But
this is rarely required, and should not be done unless you are sure it is necessary for your ISP
connection.
• Disabling the SIP ALG
The Session Initiation Protocol (SIP) Application Level Gateway (ALG) is enabled by default
to optimize VoIP phone calls that use the SIP. The Disable SIP ALG check box allows you to
disable the SIP ALG. Disabling the SIP ALG might be useful when running certain
applications.