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#!/usr/bin/env python3
# Validator used to check if given IPv6 prefix is of size /64 required by EUI64
import ipaddress
from sys import argv
from sys import exit
if __name__ == '__main__':
if len(argv) != 2:
exit(1)
prefix = argv[1]
try:
network = ipaddress.ip_network(prefix)
if network.prefixlen == 64:
exit(0)
except ValueError:
print(
'EUI64 prefix must be a valid IPv6 prefix in CIDR notation (e.g., 2001:db8::/64)'
)
exit(1)
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