Bedienungsanleitung Netgear DGN2200Bv4 (Seite 37 von 133) (Englisch)

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NETGEAR genie Advanced Home

N300 Wireless ADSL2+ Modem Router DGN2200v4

WAN Setup Screen Fields

The following fields are available:

• WAN Preference. By default this field is set to Auto-Detect so that the modem router

automatically detects if the Internet connection is through the ADSL port or the

WAN/Ethernet port 4. You can use this field to select Must use DSL WAN or Must use

Ethernet WAN.

• Use port 4 as. By default, Auto-Detect is selected so that the modem router detects if

Ethernet port 4 is used as a LAN or WAN port. For example, if you connect a computer to

Ethernet port 4, then it works as a LAN port. You can select LAN or WAN if you do not

want to use the auto-detect setting.

• Disable Port Scan and DoS Protection. DoS protection protects your LAN against

denial of service attacks such as Syn flood, Smurf Attack, Ping of Death, Teardrop Attack,

UDP Flood, ARP Attack, Spoofing ICMP, Null Scan, and many others. This should be

disabled only in special circumstances.

• Default DMZ Server. This feature is sometimes helpful when you are playing online

games or videoconferencing. Be careful when using this feature because it makes the

firewall security less effective. See the following section,

Default DMZ Server.

• Respond to Ping on Internet Port. If you want the modem router to respond to a ping

from the Internet, select this check box. Use this feature only as a diagnostic tool

because it allows your modem router to be discovered. Do not select this check box

unless you have a specific reason.

• Disable IGMP Proxying. The IGPM proxying feature lets a LAN computer receive the

multicast traffic directed to it from the Internet. Selecting this check box prevents this from

occurring.

• 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 is rarely required. You should change the setting in this

field only if you are sure that it is necessary for your ISP connection. See

Change the

MTU Size on page 38.

• NAT Filtering. Network Address Translation (NAT) determines how the modem router

processes inbound traffic. 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. Open

NAT provides a much less secured firewall, but allows almost all Internet applications to

function.

• Disable SIP ALG. The Session Initiation Protocol (SIP) Application Level Gateway (ALG)

is enabled by default to optimize VoIP phone calls that use the SIP. Select the Disable

SIP ALG check box to disable the SIP ALG. Disabling the SIP ALG might be useful when

you are running certain applications.

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