Netgear WNR2500 - N450 Wireless Router 사용자 설명서
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N450 Wireless Router WNR2500
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Disable IGMP Proxying. IGMP proxying allows computers on the LAN to receive the
multicast traffic they are subscribed to from the Internet. By default, this check box is
selected, and the IGMP proxy is disabled, preventing multicast traffic from the Internet to
the LAN. Clear the Disable IGMP Proxying check box to allow multicast traffic from the
Internet to the LAN.
multicast traffic they are subscribed to from the Internet. By default, this check box is
selected, and the IGMP proxy is disabled, preventing multicast traffic from the Internet to
the LAN. Clear the Disable IGMP Proxying check box to allow multicast traffic from the
Internet to the LAN.
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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. This change is rarely required. Do not make this change unless
you are sure that it is necessary for your ISP connection. For more information, see
networks is 1500 bytes, or 1492 bytes for PPPoE connections. For some ISPs, you might
need to reduce the MTU. This change is rarely required. Do not make this change unless
you are sure that it is necessary for your ISP connection. For more information, see
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NAT Filtering. Network Address Translation (NAT) determines how the router processes
inbound traffic:
inbound traffic:
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Secured NAT provides a secured firewall to protect the computers on the LAN from
attacks from the Internet, but might prevent some Internet games, point-to-point
applications, or multimedia applications from functioning. By default, the Secured
radio button is selected.
attacks from the Internet, but might prevent some Internet games, point-to-point
applications, or multimedia applications from functioning. By default, the Secured
radio button is selected.
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Open NAT provides a much less secured firewall, but allows almost all Internet
applications to function.
applications to function.
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Disable SIP ALG. Some Voice over IP (VoIP) applications do not function well with the
Session Initiation Protocol (SIP) Application Layer Gateway (ALG). Selecting the check
box to turn off the SIP ALG might enable connected VoIP devices to create and accept a
VoIP call through the router. By default, this check box is cleared.
Session Initiation Protocol (SIP) Application Layer Gateway (ALG). Selecting the check
box to turn off the SIP ALG might enable connected VoIP devices to create and accept a
VoIP call through the router. By default, this check box is cleared.
Default DMZ Server
The default DMZ server feature is helpful when you use some online games and
videoconferencing applications that are incompatible with Network Address Translation
(NAT). The router is programmed to recognize some of these applications and to function
correctly with them, but other applications exist that might not function well. In some cases,
one local computer can run the application correctly if that computer’s IP address is entered
as the default DMZ server.
videoconferencing applications that are incompatible with Network Address Translation
(NAT). The router is programmed to recognize some of these applications and to function
correctly with them, but other applications exist that might not function well. In some cases,
one local computer can run the application correctly if that computer’s IP address 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.
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 router 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 on the Port Forwarding / Port
Triggering screen (see
your local computers or a service that you have configured on the Port Forwarding / Port
Triggering screen (see
93). Instead of discarding this traffic, you can forward it to one computer
on your network. This computer is called the default DMZ server.