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Chapter 8 WAN
NBG-460N User’s Guide
148
8.6 Technical Reference
The following section contains additional technical information about the NBG-
460N features described in this chapter.
8.6.1 IGMP
IGMP version 2 (RFC 2236) is an improvement over version 1 (RFC 1112) but
IGMP version 1 is still in wide use. If you would like to read more detailed
information about interoperability between IGMP version 2 and version 1, please
see sections 4 and 5 of RFC 2236. The class D IP address is used to identify host
groups and can be in the range 224.0.0.0 to 239.255.255.255. The address
224.0.0.0 is not assigned to any group and is used by IP multicast computers. The
address 224.0.0.1 is used for query messages and is assigned to the permanent
group of all IP hosts (including gateways). All hosts must join the 224.0.0.1 group
in order to participate in IGMP. The address 224.0.0.2 is assigned to the multicast
routers group.
Enable Auto-bridge
mode
Select this option to have the NBG-460N switch to bridge mode
automatically when the NBG-460N gets a WAN IP address in the
range of 192.168.x.y (where x and y are from zero to nine) no
matter what the LAN IP address is.
Note: The NBG-460N automatically turns back to Router Mode
when the NBG-460N gets a WAN IP address that is not
in the 192.168.x.y range.
Clear this check box if you are playing IPTV as the NBG-460N needs
to be in Router Mode for the IPTV STB port to work.
Apply Click Apply to save your changes back to the NBG-460N.
Reset Click Reset to begin configuring this screen afresh.
Table 51 Network > WAN > Advanced
LABEL DESCRIPTION