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Excluding options field in IPv4 header, after 20 bytes of header, data follows. That data may be TCP packet, or UDP etc.
Now given a IPv4 packet (with header and data), How to find out which type of transport layer packet (TCP/UDP/etc.) is present in data? Actually I am parsing a IPv4 packet so I need to understand this.
Deep packet inspection? Ipoque release some open source code for this task: opendpi.