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IP Networking
i want a UDP Client receiving program
Post 74594 by kapslock on Friday 10th of June 2005 03:46:32 PM
06-10-2005
Quote:
Originally Posted by Nirmala
Hi
I want a UDP client receiving program. Here is the scenario. The client has to listen to the UDP server and has to acknowledge back on receiving data from the server. Can anyone help me out.
regards,
Nirmala
I want a UDP client receiving program. Here is the scenario. The client has to listen to the UDP server and has to acknowledge back on receiving data from the server. Can anyone help me out.
regards,
Nirmala
UDP was never meant to acknowledge data receipt - so the ack meachnism isn't built in the protocol. If you'e building the ack mechanism on top of UDP, you need to realize that
1. Do you want to send an ack for every packet received? This is quite a big overhead.
2. What if the ack packet is lost? Would you implement a timeout mechanism at the sending end to retransmit the packet if an ack is not received before the timeout?
3. If it is a two-way communication, would you want to implement piggybacking where the ack would be sent alongwith data?
You'd realize that as you address these problems, you're approaching TCP itself
Hope that helps.
Kapil Sharma
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LEARN ABOUT SUNOS
in.chargend
in.chargend(1M) System Administration Commands in.chargend(1M) NAME
in.chargend - UDP or TCP character generator service daemon SYNOPSIS
in.chargend FMRI svc:/internet/chargen:default DESCRIPTION
FMRI stands for Fault Management Resource Identifier. It is used to identify resources managed by the Fault Manager. See fmd(1M) and smf(5). The in.chargend service provides the server-side of the character-generator protocol. This protocol is used for debugging and bandwidth measurement and is available on both TCP and UDP transports, through port 19. The in.chargend service is an inetd(1M) smf(5) delegated service. The in.chargend detects which transport is requested by examining the socket it is passed by the inetd daemon. TCP-based service Once a connection is established, the in.chargend generates a stream of data. Any data received is discarded. The server generates data until the client program terminates the connection. Note that the data flow is limited by TCP flow control mechanisms. UDP-based service The in.chargend listens for UDP datagrams. When a datagram is received, the server generates a UDP datagram in response containing a random number of ASCII characters (ranging from 0 to 512 characters). Any received data is ignored. The in.chargend data consists of a pattern of 72 character lines containing the printable, 7-bit ASCII characters. Each line is terminated with a carriage return and a line feed character. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcnsu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
inetd(1M), attributes(5), smf(5) RFC 864 SunOS 5.10 23 Aug 2004 in.chargend(1M)