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Section 9: IP Remotes Can't Connect to LAN

1. Check the LAN link LEDs on both the remote and the master.
2. If the LEDs are lit, you can use a PC connected to the network to ping the network elements between the remote site and the NOC.
3. Ping the remote, the gateway for the remote site, the gateway for the NOC, and the master.
4. If you can't ping all four of those elements, you have an IP network problem. Ask your network administrator for help.
5. If all pings are successful, unplug the remote and ping it again.
6. The ping should fail - but if it doesn't, you have two devices with the same IP address. Check the remote's configuration and make sure it has a unique IP address.

Check for this likely cause: The Address Resolution Protocol (ARP) table of your router may need to be flushed. The ARP table associates IP addresses to MAC addresses. If another device has used this IP address - for example, if a turn-up tech used his laptop to verify the address - then the ARP table might still associate the IP address with an old MAC address. If the ARP table doesn't associate the remote's MAC address to its IP address, the router won't let packets get through.

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