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The Protocols Filter control lets you list the TCP port numbers for up to
sixteen protocols that you do not want LAN users to use over the WAN
connection. A list of standard, commonly used TCP port numbers appears next
to the table to help you create entries. To create an entry, simply click in a
TCP Port # box and type a port number.
NetBIOS over TCP/IP Filter
NetBIOS is a communication protocol designed for use on small networks and
heavily reliant on network-wide broadcasts. “NetBIOS over TCP/IP” (often
abbreviated as NBT) is a means of letting NetBIOS requests travel between
networks in TCP/IP packets. This method is used in Windows 95 and
Windows NT.
Since NetBIOS over TCP/IP can be routed between networks, it can trigger
dial-out on a dial-on-demand PPPoE WAN connection (see “Global WAN
Mode” under “Basic Setup — Broadband Router,” above). If you have a
PPPoE link to your ISP, and the Connect on Demand control is set to Yes,
you will almost certainly need to enable the NetBIOS over TCP/IP filter.
When the filter is enabled, NetBIOS over TCP/IP packets will not trigger
dialing and will not be passed from the LAN to the WAN link. (NetBIOS over
TCP/IP will still work among the machines on the LAN.)
If the Wireless Gateway's WAN port connects a LAN to a corporate network
containing resources that local machines must access using NetBIOS over
TCP/IP, the NetBIOS over TCP/IP Filter control should be set to Disable to
let those packets through.
Block WAN Request
The Block WAN Request function, if enabled, causes the Wireless Gateway to
ignore requests addressed to it from the WAN. This makes the Wireless
Gateway almost “invisible” to the outside world while still allowing access to
the WAN from the LAN.
Note that if the Block WAN Request function is enabled, outside machines
will not be able to “ping” the Wireless Gateway and remote management of
the Wireless Gateway will not be possible.
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