3com 4226T User Manual

You can use one of the following methods to allocate IP information to 
your Switch (essential if you wish to manage your Switch across the 
network).

You can choose to configure the IP information yourself. The Switch 
remembers the information that you enter until you change it again or 
set the configuration method to Automatic.

You should use the Manual IP configuration method if:

■

you do not have a DHCP or BootP server on your network, or

■

you want to remove the risk of the IP address ever changing, or

■

your DHCP or BootP server does not allow you to allocate static IP 
addresses. (Static IP addresses are necessary to ensure that the Switch 
is always allocated the same IP information.)

If you wish to manually enter IP information for your Switch, work 
through the 

 section on 

.

By default the Switch tries to configure itself with IP information without 
requesting user intervention. It tries to obtain an IP address from a DHCP 
or BootP server on the network.

If neither server is found, the Switch will configure itself with its default IP 
address 169.254.100.100 if it is operating in a standalone mode, and/or 
no other Switches on the network have this IP address. If this default IP 
address is already in use on the network then the Switch detects this and 
configures itself with an IP address in the range 169.254.1.0 to 
169.254.254.255. 

This process is known as Auto-IP and is the same mechanism used by 
Windows 98 and Windows 2000. IP addresses configured by Auto-IP are 
temporary as they cannot be routed but are useful for small networks 
which are not connected to other networks, or for initial configuration.

DUA1730-0AAA04.book  Page 33  Thursday, November 17, 2005  2:59 PM