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Do not allow the use of the loopback interface in netmap.
The generic support in netmap send the packets using if_transmit() and the loopback do not support packets coming from if_transmit()/if_start(). This avoids the use of the loopback interface and the subsequent crash that happens when the application send packets to the loopback interface. Details in: luigirizzo/netmap#322 Reported by: Vincenzo Maffione <v.maffione@gmail.com> Sponsored by: Rubicon Communications, LLC (Netgate)
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