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If i open a raw socket, and send udp packets with a wrong checksum, would the packets be dropped other side by the tcp/ip stack?
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There is no sequence ordering and retransmission mechanism in UDP. If the checksum does not match packet is simply discarded.
Congestion in the network is the primary reason for packet loss in UDP, as every communication network has a flow limit. For example, network congestion is similar to a traffic jam on the road, where exceeding the maximum number of vehicles allowed on a given road may cause traffic to slow or stop during peak hours.
The UDP packet loss is especially affected by TCP traffic and its flow control mechanism. This is because TCP flow control continues to increase its window size until packet loss occurs if the advertised window size is large enough.
Checksum. The final two bytes of the UDP header is the checksum, a field that's used by the sender and receiver to check for data corruption.
Yes they would be dropped. If you need more reliable communication you're much better off using TCP.
for more information, take a look at this: http://www.diffen.com/difference/TCP_vs_UDP
UDP there's no guarantee that the packets will even be sent, let alone received. If they are in fact received though, they are checked. If they fail checksum they are dropped.
EDIT: also to add to that, udp does not by default order the packets as they are sent, that has to be done at the application level. Bear this in mind if you still intend on using UDP.
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