Change interface index while sending packets in class [NetworkInterface]

[ahmedtalaat327]

Say I want to choose specific interface ad then sending a packet to specific IP through this interface [acts like a gateway]
using this definition is not possible:

/**
* \brief Constructs a NetworkInterface from an ip address.
*
* This abstracted interface will be the one that would be the gateway
* when sending a packet to the given ip.
*
* \param ip The ip address being looked up.
*/
NetworkInterface(IPv4Address ip);