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Techniques involved in Sybil attacks:

• Social community-based technique.
• Specific peer-to-peer system feature-based solutions.
• Social network-based methods.
• Traditional security key-based approaches.

Sample code for Sybil attack:
This is the sample code of how to create udp agent and traffic analysis in vanet network.Create a UDP agent and attach it to node
set udp0 [new Agent/UDP] $ns attach-agent $node_(5) $udp0
set null0 [new Agent/Null] $ns attach-agent $node_(0) $null0
$ns connect $udp0 $null0

set cbr0 [new Application/Traffic/CBR] $cbr0 attach-agent $udp0

$ns at 7.8 “$cbr0 start”
$ns at 8.0 “$cbr0 stop”
$ns at 7.8 “$ns trace-annotate \”SYBILL COMMUNICATES WITH NODE0 \””

#Create a UDP agent and attach it to node
set udp1 [new Agent/UDP] $ns attach-agent $node_(0) $udp1
set null1 [new Agent/Null] $ns attach-agent $node_(3) $null1
$ns connect $udp1 $null1

set cbr1 [new Application/Traffic/CBR] $cbr1 attach-agent $udp1

$ns at 8.1 “$cbr1 start”
$ns at 8.3 “$cbr1 stop”
$ns at 8.1 “$ns trace-annotate \”VERIFY SYBILL NODE BY NODE0 \””