Udp broadcast c program

To send a datagram using UDP, you must know the network address of the network device hosting the service you need and the UDP port number that the service uses to communicate. Services not on the IANA list can have port numbers in the range 1, to 65, The following discussion uses the IP version 4 address family used on the Internet as an example.

IP version 4 addresses use 32 bits to specify a network address. For class C addresses using a netmask of When expressed in decimal, the four octets form the familiar dotted-quad notation, such as The first two octets Setting all the bits of an IP address to one, or Sending a UDP datagram to this address delivers the message to any host on the local network segment.

Because routers never forward messages sent to this address, only hosts on the network segment receive the broadcast message. For posterity, I had set up two static IP'd computers on their own hub, instead of using the built in DHCP server on the server machine to allocate the IP address for the other computer.

Pretty localized for my problem but you never know.. Be sure that netmask is correct. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 9 years, 3 months ago. Active 7 years, 4 months ago. Viewed 38k times. Is there any other hoop I have to jump through to receive an untargeted UDP broadcast?

Improve this question. Blindy Blindy This code works for me after slight modification to make it compile with a C compile. Possible the bind is binding to the wrong interface? What does netstat -an grep return on the client machine?

Yeah it's supposed to work, but it doesn't for me. Only connect and listen do that. But you do not need to open a port via listen in order to receive UDP broadcasts. Regardless of the language you are using, here is my answer: Regarding the broadcast IP addresses, both addresses are broadcast addresses but the limited broadcast address which is Improve this answer.

So, basically, on the client side, I listen for port x on the local ip? RedPeasant RedPeasant 1 1 gold badge 10 10 silver badges 17 17 bronze badges. Matt Davis Matt Davis Sign up or log in Sign up using Google.

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