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DHCP, DNS, and NTP issues
Dynamic Host Configuration Protocol (DHCP) allows network connected devices to automatically obtain
a unique IP address from the network router or other DHCP server. Domain Name System (DNS)
translates domain names to their numerical IP addresses. The Vertex requires DNS to obtain the IP
addresses for the National Time servers to get the National Time Protocol (NTP).
In order to troubleshoot problems with DHCP, DNS, and NTP the Vertex must be connected as shown
in the diagram below, so that it can monitor the Network Packets sent and received from the
Management Port. A particular DIP switch setting is used along with the Network Packet Capture
feature in the Advanced Tab. Analyzing the network packets requires an application such as
Wireshark.
1. Make sure any VoIP phone traffic or critical internet traffic is not in progress.
2. Disconnect all Network Cables from the Vertex unit.
3. Reconnect the Router cable to the Switch to re-establish VoIP calls and internet traffic.
4. Connect the Management Port network cable to one of the VoIP Bridge ports.
5. Connect the other VoIP Bridge Port to a network switch or router.
6. Set Dip switches on back of Vertex to:
7. In the VCT, select the Advanced Tab, unlock using password
callerid
.
8. Under Network Packet Capture, select:
Bootup
and then
Start
.
9. Reboot Vertex using the Power Plug on the back of the unit.
10. Wait until finished, name the file, and select OK.
11. You can access the file by selecting
Upload to CallerID.com
.
12. Use Wireshark or similar program to analyze.
