Keri Systems NXT Network Connection - Manual

NXT Network Connection
Troubleshooting Guide
Page 1 of 11 P/N: 01508-001 Rev. A
Section 1 – Basic Principles of TCP/IP Network Communications
Section 2 – Introduction to Doors NetXtreme
Section 3 – Common Connection Issues
Section 4 – Common Causes
Section 5 – Tools
Section 6 – Contact Keri Systems
1.0 Basic Principles of TCP/IP Network Communications
Before troubleshooting, it is necessary to understand the basic principles of TCP/IP network communications.
1.1 TCP/IP Communication Basics: IP Addresses and Subnetting
For proper communication between network devices, it is crucial that those devices are properly configured with IP
addresses, subnet masks, and gateway addresses that match the network environment in which they are installed.
The IP Address is made up of four octets usually represented in dotted-decimal notation (i.e. 192.168.1.1). Each IP
Address contains a Network ID and a Host ID. The Network ID identifies the network where the host or other network
devices are located. The Host ID identifies the individual device on the network. The Subnet Mask is used to determine
the Network ID and Host ID of an IP Address.
Using the above IP Address example of 192.168.1.1, if the Subnet mask is 255.255.255.0 (Class C), the Network ID
would be 192.168.1 while the Host ID would be 1. This Host will be able to communicate to any other device on that
network whose IP address is 192.168.1.1 – 254 (255 is reserved for network broadcasts). If the Subnet mask is
255.255.0.0 (Class B), the Network ID would be 192.168, and the Host ID would be 1.1. This Host will be able to
communicate to any other device on that network whose IP address is 192.168.0.1 – 192.168.254.254.
Any communication to a device that is on another network (or outside of the Subnet mask) would be passed on to the
Gateway, which will route the data to the appropriate Network and Host. If the Gateway does not have a route specified
for the destination network, then the communication will fail.