Billion BiPAC 7800GZ(L) User Manual page 167

Then go to Advanced mode > Configuration > Advanced > VLAN. Then configure a port that will
use the IPTV application. The example below is a setting that illustrates that only Ethernet port #4
can connect to STB and use IPTV.
Note: The VLAN setting illustrated bridges both WAN Profile and the Ethernet Port 4 so that
the Ethernet port can connect to STB and get the IP directly from the IPTV Service Network.
Thus, Ethernet port 4 can no longer be used for internet access and WEB management.
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