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C# Auto Discovery
Posted on 2016-07-26
I found this article that contains code on a client / server application can communicate with each other without knowing their IP address prior the the first network handshake. The article discusses using UDP.
http://www.nullskull.com/a/1551/clientserver-autodiscovery-in-c-and-udp-sockets.aspx
My understanding of UDP is that it is not as secure as TCP.
Is there a TCP example?
Or any other advice? I need a client to auto discover a server app without knowing the IP. I know bonjour is a possibility but looking for another solution.
Thanks
http://www.nullskull.com/a/1551/clientserver-autodiscovery-in-c-and-udp-sockets.aspx
My understanding of UDP is that it is not as secure as TCP.
Is there a TCP example?
Or any other advice? I need a client to auto discover a server app without knowing the IP. I know bonjour is a possibility but looking for another solution.
Thanks
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4 Comments
Active today
For this situation you want to use UDP. It doesn't have to be secure because you are not making a secure connection, instead you are sending a network wide signal. It's basically a ping. For this ping you want the smaller footprint that a UDP packet allows for. Anyone that is listening for the ping responds.
After you receive the ping acknowledgement do you attempt to make the secure tcp connection. I believe that you think that you have to use a different port than that of which you currently use but that is not the case.
TCP/80 is not the same as UDP/80 (not implying that this is the port you use).
WCF even implements helper classes for UdpDiscovery: https://msdn.microsoft.com/en-us/library/dd456791(v=vs.110).aspx
-saige-
After you receive the ping acknowledgement do you attempt to make the secure tcp connection. I believe that you think that you have to use a different port than that of which you currently use but that is not the case.
TCP/80 is not the same as UDP/80 (not implying that this is the port you use).
WCF even implements helper classes for UdpDiscovery: https://msdn.microsoft.com/en-us/library/dd456791(v=vs.110).aspx
-saige-
Active 2 days ago
Saige,
So if I understand correct, use UDP for the ping. Once I receive the acknowledgement, then switch to TCP to make the secure connection?
Thanks
So if I understand correct, use UDP for the ping. Once I receive the acknowledgement, then switch to TCP to make the secure connection?
Thanks
Active today
Exactly. The information that you send back, is supposed to carry an acknowledgement, ip address and a port (if required). The client then takes the acknowledgement and connects to the ip address and port using whatever mechanism you employ to secure tcp communications.
-saige-
-saige-
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