Owner's Manual

genie Advanced Home

N300 Wireless Router JWNR2000v3

• 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. Use this

setting 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, for more

details.

• Respond to Ping on Internet Port. If you want the 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 router to be discovered. Do not select this check box unless you have a specific

reason.

• Disable IGMP Proxying. IGMP proxying allows a computer on the local area network

(LAN) to receive the multicast traffic it is interested in from the Internet. If you do not need

this feature, you can select this check box to disable it.

• 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. Reducing the MTU is rarely required, and should not be done

unless you are sure that it is necessary for your ISP connection. See

Change the MTU

Size on page 44.

• NAT Filtering. Network Address Translation (NAT) determines how the 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 it allows almost all Internet applications to

function.

• Disable SIP ALG. Some SIP (Session Initiation Protocol) applications have their own

way to work around the NAT firewall issue, and the SIP ALG (Application Layer Gateway)

would conflict with those solutions. In most cases, you do not have to disable the SIP

ALG. However, if your SIP applications cannot work with the router, you can disable the

SIP ALG and try the applications again. Select the check box to disable SIP ALG.

 To view or change the WAN settings:

1. Select ADVANCED > Setup > WAN Setup.

The WAN Setup screen displays.

2. Specify the settings for your Internet connection.

For more information about the settings, see WAN Setup on page 42.

3. Click Apply.

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 router is programmed to recognize some of these applications and to work