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Reference Guide for the Model RP114 Web Safe Router
Configuring Filters 10-11
Default Filters
The Model RP114 router is preconfigured with the filters shown in Figure 10-1 on page 10-2 and
in this section.
Filter 1: NetBIOS_WAN
The NetBIOS_WAN filter is an IP protocol filter used to prevent the sending of Windows
NetBIOS name service packets to the ISP. The ports used by NetBIOS name service are:
• 137 (TCP and UDP) NetBIOS Name Service
• 138 (TCP and UDP) NetBIOS Datagram Service
• 139 (TCP and UDP) NetBIOS Session Service
This filter is applied in Menu 11.5 - Remote Node Filter as an Output Filter set.
Filter 2: NetBIOS_LAN
The NetBIOS_LAN filter is an IP protocol filter used to block NetBIOS name service requests
from a local PC to the DNS server of the ISP. These requests are UDP packets having a source port
of 137 (NNS) and a destination port of 53 (DNS).
This filter is applied in Menu 3.1 - LAN Port Filter as an Input Filter set.
Filter 3: TEL_FTP_WEB_WAN
The TEL_FTP_WEB_LAN filter is an IP protocol filter used to block Telnet, HTTP, and FTP
requests to the router from the Internet. The filter blocks TCP packets with a destination port of 21
(FTP), 23 (Telnet), or 80 (HTTP).
This filter is not used, but can be applied in Menu 11.5 - Remote Node Filter as an Input Filter set.