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Assigning Multiple Addresses to a Network Interface
ip Streamlines Advanced Networking
October 10, 2008
brd + means "automatically set the broadcast address." View the results with this command:
If you run ifconfig to check your addresses, it will see only the first one.
This is a great way to get access to multiple subnets without having to create a herd of new configurations, or install multiple network interface cards. Another practical use for this is accessing a new server or router for the first time. Typically, these come with a default IP address. If it's on a different subnet, but on the same switch, you can quickly add a compatible address to your workstation and log in to the new device. When you're finished, remove the unwanted addresses like so:
man ip is the best and most complete reference.
Article courtesy of Serverwatch.com, originally published June 16, 2008