5 - Writing UDP/SOCK_DGRAM applications

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5 - Writing UDP/SOCK_DGRAM applications

1. When should I use UDP instead of TCP?
2. What is the difference between "connected" and "unconnected" sockets?
3. Does doing a connect() call affect the receive behaviour of the socket?
4. How can I read ICMP errors from "connected" UDP sockets?
5. How can I be sure that a UDP message is received?
6. How can I be sure that UDP messages are received in order?
7. How often should I re-transmit un-acknowleged messages?
8. How come only the first part of my datagram is getting through?
9. Why does the socket's buffer fill up sooner than expected?