Setting The Mtu Size; Disabling Igmp Proxying; Disabling Sip Alg; Enabling Ipv6 Pass-Through - NETGEAR WNR500 User Manual

N-150 2-Port Wireless Router WNR500 User Manual

Setting the MTU Size

The normal MTU value for most Ethernet networks is 1500 bytes, 1492 bytes for PPPoE
connections, or 1450 for PPTP connections. For some ISPs, you might need to reduce the MTU
size, but this is rarely required and should not be done unless you are sure it is necessary for your
ISP connection. For more information, see "Changing the MTU Size" on page 5-15.
To change the MTU size:
1. In the MTU Size field, enter a new size between 64 and 1500.
2. Click Apply to save the new configuration.

Disabling IGMP Proxying

The IGMP Proxying function lets a LAN PC receive the multicast traffic it is interested in from the
Internet. If you do not need this function, you can click the Disable IGMP Proxying check box to
disable this function.

Disabling SIP ALG

Some SIP applications have their own way to work around the NAT firewall issue, and the SIP
ALG 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. To disable SIP ALG, click the Disable SIP ALG check box.

Enabling IPv6 Pass-Through

IPv6 pass-through is disabled by default. If you have IPv6-capable devices in your configuration
and would like to use those devices instead of IPv4, you can click the Enable IPv6 Pass-Through
check box to enable the IPv6 Pass-Through function.

Configuring 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 allows almost
all Internet applications to function. For more information about NAT, see "How Your Computer
Accesses a Remote Computer through Your Router" on page 5-2.
Customizing Your Network Settings 4-9
v1.0, November 2011