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I am trying to send UDP with datagram in JAVA and my machine have several NIC with different IP's. How can I set which NIC I want my packet to be sent from ?? (assuming I have more than one on the machine ??) EDIT I I am not using Socket, I am using DatagramSocket and tried to do binding like so: /*binding */ DatagramSocket ds = new DatagramSocket(1111); NetworkInterface nif = NetworkInterface.getByIndex(nicIndex); Enumeration<InetAddress> nifAddresses = nif.getInetAddresses(); ds.bind(new InetSocketAddress(nifAddresses.nextElement(), 0)); But when I do so, I can not connect anymore （or can not get the packet ..). The problem is that I have 2 NIC, but one is for INTERNAL network and the other one is for Internet .. I need all my server data to go only on the INTERNAL one.. EDIT II For Clarification . This App is a server - and the SERVER has 2 NICS . one LAN and one for WAN. An alternative way for me would to specify a ROUTING somehow - meaning to tell each packet exactly which NIC to use .. How to do such a routing in JAVA ??

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