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Wireless Cable Voice Gateway CG3700EMR-1CMNDS
Network Address Translation (NAT). The gateway is programmed to recognize some
of these applications and to work correctly with them, but some applications do not
function well. In some cases, one local computer can run the application correctly if
the IP address of that computer is entered as the default DMZ server.
Be careful when using this feature becuase it makes the firewall security less
effective.
•
Respond to Ping on Internet Port
. If you want the gateway to respond to a ping
from the Internet, select this check box. Use this feature only as a diagnostic tool
because it also allows your gateway to be discovered. Do not select this check box
unless you have a specific reason.
•
MTU Size (in bytes)
. 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. Reduce the MTU only if you are sure that it
is necessary for your ISP connection.
•
Disable SIP/ALG
. The Session Initiation Protocol (SIP) Application Level Gateway
(ALG) is disabled by default, which is useful when you are running certain
applications. To enable SIP/ALG and optimize VoIP phone calls that use the SIP,
clear the check box.
WARNING:
DMZ servers pose a security risk. A computer that is designated
as the default DMZ server loses much of the protection of the
firewall and is exposed to exploits from the Internet. If
compromised, the DMZ server computer can be used to attack
other computers on your network.
The gateway discards incoming traffic from the Internet unless the traffic is a response to one
of your local computers or a service that you have configured in the Port Forwarding/Port
Triggering screen. Instead of discarding this traffic, you can have it forwarded to one
computer on your network. This computer is called the default DMZ server.
To set up a default DMZ server:
1.
On the WAN Setup screen, select the
Default DMZ Server
check box.
2.
Type the IP address.
3.
Click the
Apply
button.
LAN Setup
The LAN Setup screen allows you to configure LAN services such as the IP address of the
gateway and DHCP. The TCP/IP and DHCP default values work fine in most cases.
The gateway is shipped preconfigured to use private IP addresses on the LAN side and to act
as a DHCP server. The default LAN IP configuration of the gateway is:
19216811.live