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Nico Schottelius 2020-01-07 18:08:53 +01:00 committed by Timothée Floure
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detect-dns64-prefix.py
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# Nico Schottelius, 2020-01-07 # Nico Schottelius, 2020-01-07
# Detect the DNS64 prefix # Detect the DNS64 prefix
# Based on https://tools.ietf.org/html/draft-ietf-behave-nat64-discovery-heuristic-05 # Based on https://tools.ietf.org/html/draft-ietf-behave-nat64-discovery-heuristic-05
#
# How it works:
# - ipv4only.arpa only has A records.
# - a DNS64 server will add AAAA records
# - we take this response (if any) and derive the IPv6 prefix from it
#
import dns.resolver import dns.resolver
import ipaddress import ipaddress