Netgear C7100V User Manual - Page 70

Set Up a Default DMZ Server, Disable SIP ALG

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AC1900 Cable Modem Voice Router MTU only if you are sure that it is necessary for your ISP connection. See Change the MTU Size on page 27. • Disable SIP ALG. Some VoIP applications do not work well with the SIP ALG. Selecting this check box to turn off the SIP ALG might help your VoIP devices to create or accept a call through the modem router. SIP ALG stands for Application Layer Gateway, and is common in many commercial routers. It intends to prevent some of the problems caused by router firewalls by inspecting VoIP traffic (packets) and if necessary modifying it. Many routers have SIP ALG turned on by default. 6. Click the Apply button. Your settings are saved. Set Up a Default DMZ Server The default DMZ server feature is helpful when you are using some online games and videoconferencing applications that are incompatible with Network Address Translation (NAT). The modem router is programmed to recognize some of these applications and to work correctly with them, but other applications might not function well. In some cases, one local computer can run the application correctly if the IP address for that computer is entered as the default DMZ server. WARNING: DMZ servers pose a security risk. A computer 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 modem router usually detects and discards incoming traffic from the Internet that is not a response to one of your local computers or a service that you configured in the Port Forwarding/Port Triggering page. Instead of discarding this traffic, you can direct the modem router to forward the traffic to one computer on your network. This computer is called the default DMZ server.  To set up a default DMZ server: 1. Launch an Internet browser from a computer or mobile device that is connected to the network. 2. Type http://www.routerlogin.net or http://www.routerlogin.com. A login window opens. 3. Enter the user name and password. Specify Network Settings 70

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Specify Network Settings
70
AC1900 Cable Modem Voice Router
MTU only if you are sure that it is necessary for your ISP connection. See
Change the
MTU Size
on page
27.
•
Disable SIP ALG
. Some VoIP applications do not work well with the SIP ALG.
Selecting this check box to turn off the SIP ALG might help your VoIP devices to
create or accept a call through the modem router.
SIP ALG stands for Application Layer Gateway, and is common in many commercial
routers. It intends to prevent some of the problems caused by router firewalls by
inspecting VoIP traffic (packets) and if necessary modifying it. Many routers have SIP
ALG turned on by default.
6.
Click the
Apply
button.
Your settings are saved.
Set Up a Default DMZ Server
The default DMZ server feature is helpful when you are using some online games and
videoconferencing applications that are incompatible with Network Address Translation
(NAT). The modem router is programmed to recognize some of these applications and to
work correctly with them, but other applications might not function well. In some cases, one
local computer can run the application correctly if the IP address for that computer is entered
as the default DMZ server.
WARNING:
DMZ servers pose a security risk. A computer 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 modem router usually detects and discards incoming traffic from the Internet that is not a
response to one of your local computers or a service that you configured in the Port
Forwarding/Port Triggering page. Instead of discarding this traffic, you can direct the modem
router to forward the traffic to one computer on your network. This computer is called the
default DMZ server.
To set up a default DMZ server:
1.
Launch an Internet browser from a computer or mobile device that is connected to the
network.
2.
Type
or
.
A login window opens.
3.
Enter the user name and password.