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Cisco IOS supports multiple IP Addresses on an interface. There will be one Primary IP Address on the interaface and multiple Secondary IP Addresses on the interface. There is no limit on the number of IP Addresses that can be configure on an interface. Configurng multiple IP Addresses on your cisco routers can sometime help where you have multiple subnets having one physical router interface.

The IP Addresses can be from different subnets and from different networks.

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Sometimes, there is a need to have more than one IP Addresses assigned to a PC or a Server. If you have multiple services running on a server like a webserver and a mail server and want to assign each of these services seperate IP Addresses the Multiple IP addresses will help. While this need not necessarily require to have more than one Network Interface Card (NIC) on the server.

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