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When you setup a client application, you MAY want to bind to a specific configured IP address. Knowing the destination IP address, you can use the functions function NetIPv4_GetAddrSrc() or NetIPv6_GetAddrSrc() to found the best suited configured IP address for your destination. 

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Refer to section Socket Programming for more information on using network sockets.

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Removing Statically Assigned IP Addresses From An Interface

Statically assigned IPv4 addresses for a specific interface may be removed by calling NetIPv4_CfgAddrRemove().

Alternatively, the application may call NetIPv4_CfgAddrRemoveAll() to remove all configured static IPv4 addresses for a specific interface.

The same goes for IPv6. A statically assigned IPv6 address for a specific interface may be removed by calling NetIPv6_CfgAddrRemove(). Also, all statically configured IPv6 addresses for a specific interface can be removed by calling NetIPv6_CfgAddrRemoveAll().

Getting all the IP Addresses Configured on a Specific Interface

The application may obtain the IPv4 protocol address information for a specific interface by calling NetIPv4_GetAddrHost(). This function may return one or more configured addresses.

Similarly, the application may call NetIPv4_GetAddrSubnetMask() and NetIPv4_GetAddrDfltGateway() in order to determine the IPv4 subnet mask and IPv4 gateway information for a specific interface.

With IPv6, applications may obtain the IPv6 protocol address information for a specific interface by calling NetIPv6_GetAddrHost(). This function may return one or more configured addresses.

Assigning Static IP Addresses to an Interface 

IPv4

The constant NET_IPv4_CFG_IF_MAX_NBR_ADDR specified in net_cfg.h determines the maximum number of IPv4 addresses that may be assigned to an interface. Many IPv4 addresses may be added up to the specified maximum by calling NetIPv4_CfgAddrAdd(). 

Configuring an IPv4 gateway address is not necessary when communicating only within your local network.

IPv6 

With IPv6, the µC/TCP-IP stack can autoconfigured itself, meaning that it can setup its own IPv6 link-local address based on the MAC address of the Interface and also it can setup an IPv6 global address if a IPv6 router is present on the local network. The IPv6 autoconfiguration is not yet available with the µC/TCP-IP stack. 

It is still possible to setup IPv6 addresses manually by calling NetIPv6_CfgAddrAdd(). As for IPv4, the NET_IPv6_CFG_IF_MAX_NBR_ADDR specified in net_cfg.h determines the maximum number of IPv6 addresses that may be assigned to an interface.