Datagram Sockets possible without locally available IP addresses?

Hi everybody,
before starting to dig into socket programming for the next few months, I'd like to get some facts clear that don't clarify to me by consuming the developer handbooks.
I would like to send datagram packets out on all interfaces without bound sockets, i.e. I want to start something similar to a DHCP broadcast. Is this possible with Java? AFAIK always sockets are required , even for datagram communication.
Thank you

Hi! Thanks for you replies.
I'm trying to create some kind of alternative host configuration protocol with a reference implementation. Since the server software will run on Java for various purposes, it would be fine if also the client software could be implemented in Java. Therefore, I'd need the possibility to send out datagrams on unconfigured network interfaces.
As far as I have understood the DatagramSocketAPI, there's always the need to have a local socket available (IP address + port number) to actually send data - is that true?
Thank you!

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hi to All,
I am facing some problem when i am broadcasting a data packet by using the datagram socket in java
I am using the IP Address 255.255.255.255 to broadcast a packet . The Packet is send , but the programs goes in Indefinite till when receiving a Message from the Machines that are connected in the Local Network !!!!!!!!!!!
Actually , i wana to collect all the Machines IP Address by sending a Broadcast Packet(by using UDP) . Can i body tell whts the Solution of this probelm , so that i retrieve the IP Address of the Machines that are connected in a local Network

" You can only do it if you know that all machines will respond to an udp package on some port."
HI
I am having trouble in broadcasting the data on 255.255.255.255 at port 3988.
Can you people send me the code for -
How to broadcast the data on 255.255.255.255 at port 3988 ??
and
How it can be received by any client machine at its port 3988 and How client can come to know from where the data is coming i.e. from which machine the data is coming.
As you have told that it is possible if we know the port "You can only do it if you know that all machines will respond to an udp package on some port.", the port is 3988.
Thanks & Regards
Abhishek

Datagram Socket Problem !!!!!!!!!!!!!!!

Hi to All ,
I am facing problem regarding the Datagram Socket Programming .
I wana to make a java program that is using the datagram socket. I wana to retrive the IP Address of all the machines that are connected in a local network by using the datagram Socket !!!!!!!!!!!!!!
As i am new in java Socket Programming , Can any body help me How am i sends a Broadcast Packet to all the machines that are connected in a local network , so that i retrieve the IP Address of all the machines that are presented in a local network
Please give the Solution

You can't use any Java to find all the machines on your network (whatever that means). You will need to shell out and parse the output from the shell.
If you want to simply use datagram sockets to send UDP broadcasts, the Javadoc covers it in some detail.
However, UDP is called a "send and pray" protocol - you send the message and pray that the client receives it. Also, there is no acknowledgement from the client when the message is received. So, in a nutshell, you cannot use multicasts to find clients.
You need to use some other protocols in the TCP/IP stack for finding machines on the network - and Java does not have any pre-built support for these.

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Datagram Sockets possible without locally available IP addresses?

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