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56CHAPTER 4: PROBLEM SOLVING
The IP address is split into two parts:
■ The first part (‘192.168.100’ in the example) identifies the network on which the device resides
■ The second part (‘.8’ in the example) identifies the device within the network
| The natural subnet mask for this example is 255.255.255.0. |
| If your network has a connection to the external IP network, that is, you |
| access the Internet, you must apply for a registered IP address. |
| How do you obtain a registered IP Address? |
| The IP registration system ensures that every IP address used is unique; if |
| you do not have a registered IP address, you may be using an identical |
| address to someone else and your network will not operate correctly. |
| InterNIC Registration Services is the organization responsible for |
| supplying registered IP addresses. The following contact information is |
| correct at time of publication: |
| World Wide Web site: http://www.internic.net |
| If your IP network is internal to your organization only, that is, you do not |
| access the Internet, you may use any arbitrary IP address as long as it is |
| not being used by another device on your network. 3Com suggests you |
| use addresses in the series 192.160.100.X (where X is a number between |
| 1 and 254) with a subnet mask of 255.255.255.0. |
| These suggested IP addresses are part of a group of IP addresses that |
| have been set aside specially for use ‘in house’ only. |
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Solving Stack | If you are having problems with correctly forming a stack, first ensure that |
Formation | Spanning Tree is enabled. If it is enabled, do the following: |
Problems |
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| 1 Power off all units in the stack. |
| 2 Check all the cable connections in the stack. |
| 3 Power on all units in the stack. |