Re: Detecting server on lan
Ken T. wrote:
On Wed, 01 Jul 2009 21:28:57 -0700, Knute Johnson wrote:
Ken T. wrote:
I would like to have the client detect a server on a lan. So there
will be some 30 clients on the same lan as a single server and when
they start I want them to be able to find the server and automatically
connect to it for using RMI.
My idea was to have them send out a UDP packet to the broadcast address
and then have the server respond saying, "Here I am!", but I'm having
difficulty figuring out how to send a UDP packet to the broadcast
address of the lan.
I tried just sending it to "255.255.255.255", but this didn't work. Is
there a way to detect the broadcast address? Is there a way to send a
packet to it? Is there a simpler way to do what I'm trying to do?
Thanks.
You can't just try to connect to the server?
That's the thing.. I don't know its IP address. I want to detect it.
OK, I understand what you are asking now. The UDP packet idea sounds
pretty simple. Just have the server broadcast to a specific address and
port with its IP address. The clients can read the UDP packets and
connect to the sent address. There is a range for multicast addresses,
take a look at the class MulticastSocket. It has all the details and if
you know how to do UDP datagrams in Java you should be good to go.
--
Knute Johnson
email s/nospam/knute2009/
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