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Readable content? What do you expect? Machines are communicating…not humans! But you may see some readable frazzles.
1. Intercept all incoming UDP packets from remote-port 53 (DNS)
2. Extract the DNS-information from the data-part of the packets (as described in RFC1034 and RFC1035)
3. Modify the DNS-info
4. Build new (faked) UDP packets
5. Send them to your local-port