Billion BiPAC 7800(N)X(L) User Manual page 239

Problem with LAN interface
Problem Suggested Action
Cannot PING any PC on LAN Check the Ethernet LEDs on the front panel.
The LED should be on for the port that has a PC
connected. If it does not lit, check to see if the cable
between your router and the PC is properly
connected. Make sure you have first uninstalled your
firewall program before troubleshooting.
Verify that the IP address and the subnet mask are
consistent for both the router and the workstations.
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