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You must put the absolute path at run command, e.g., /home/user/onos/tools/tutorials/artemis/server.py. 
Verify the path that is specific to your setup, using cd and/or pwd/ls, as shown in Figure 3.:

Fig. 3: Verifying the absolute path for the exaBGP configuration file (exabgp.conf).

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Now the hijacker (AS65003) will attract all the traffic away from AS65001 (destined to 40.0.0.0/8); at the same time, the ExaBGP speaker will send the BGP update of the hijack (among other updates seen by AS65004) to the ONOS instance (running ARTEMIS) and the hijack will be detected. Observing the ONOS logs, you will see that the attack is actually detected and the deaggregation mechanism has successfully mitigated the attack (by announcing the more specific prefixes 40.0.0.0/9 and 40.128.0.0/9 from the BGP speaker of the protected AS). After BGP converges and the control and data planes are consistent, the traffic of AS65001, destined to 40.0.0.0/8, returns to the protected AS, as shown in Figure 5.:

Fig. 5: Successful mitigation of the BGP prefix hijacking attack, with a data loss of only 4 packets.

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