3Com 3824 Implementation Guide - Page 72
How Your Switch Obtains IP Information, How Automatic IP Configuration Works, Automatic Process
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72 CHAPTER 9: USING AUTOMATIC IP CONFIGURATION How Your Switch Obtains IP Information Your Switch has two ways to obtain its IP address information: ■ Automatic IP Configuration (default) - the Switch attempts to configure itself by communicating with a DHCP server on the network. ■ Manual IP Configuration - you can manually input the IP information (IP address, subnet mask, and default gateway). If you select an option for no IP configuration the Switch will not be accessible from a remote management workstation on the LAN. In addition, the Switch will not be able to respond to SNMP requests. How Automatic IP Configuration Works When your Switch is powered up for the first time the IP configuration setting is set to auto - this is the default setting. If your Switch has been powered up before, whichever of the three options for IP configuration (manual, auto, none) was last configured is activated when the Switch powers up again. You can switch to manual IP configuration at any time using a serial port connection to set up the IP information. For more information see the Getting Started Guide that accompanies your Switch. Automatic Process To detect its IP information using the automatic configuration process, the Switch continually attempt to contact a DHCP server on the network requesting IP information from the server. If a DHCP server is on the network and working correctly it responds to the clients request with an IP address (allocated from a pool of available addresses) and other parameters such as a subnet mask, default gateway, lease time, and any other options configured in the DHCP server. The way a DCHP server responds is dependant on the DHCP server settings. Therefore the way your DHCP server responds may be different to the process outlined. Important Considerations This section contains some important points to note when using the automatic IP configuration feature.