ZyXEL Communications NBG334SH User Manual

Chapter 7 LAN

ZyXEL NBG-334SH User’s Guide

Figure 58   Advanced LAN

The following table describes the labels in this screen.

Table 38   Advanced LAN

Multicast

Select IGMP V-1 or IGMP V-2 or None. IGMP (Internet Group Multicast 

Protocol) is a network-layer protocol used to establish membership in a 

Multicast group - it is not used to carry user data. 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.

Active

Select this if you want to let computers on different subnets use the ZyXEL 

Device.

Windows Networking (NetBIOS over TCP/IP): NetBIOS (Network Basic Input/Output System) are TCP 

or UDP broadcast packets that enable a computer to connect to and communicate with a LAN. For 

some dial-up services such as PPPoE or PPTP, NetBIOS packets cause unwanted calls. However it 

may sometimes be necessary to allow NetBIOS packets to pass through to the WAN in order to find a 

computer on the WAN.

Allow between LAN 

and WAN

Select this check box to forward NetBIOS packets from the LAN to the WAN 

and from the WAN to the LAN. If your firewall is enabled with the default policy 

set to block WAN to LAN traffic, you also need to enable the default WAN to 

LAN firewall rule that forwards NetBIOS traffic.
Clear this check box to block all NetBIOS packets going from the LAN to the 

WAN and from the WAN to the LAN.

Apply

Click Apply to save your changes back to the ZyXEL Device.

Reset

Click Reset to begin configuring this screen afresh.