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-rwxr-xr-xsrc/conf_mode/dns_forwarding.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/conf_mode/dns_forwarding.py b/src/conf_mode/dns_forwarding.py
index 41023c135..a96183b04 100755
--- a/src/conf_mode/dns_forwarding.py
+++ b/src/conf_mode/dns_forwarding.py
@@ -266,6 +266,12 @@ def verify(dns):
if 'server' not in dns['domain'][domain]:
raise ConfigError(f'No server configured for domain {domain}!')
+ if 'dns64_prefix' in dns:
+ dns_prefix = dns['dns64_prefix'].split('/')[1]
+ # RFC 6147 requires prefix /96
+ if int(dns_prefix) != 96:
+ raise ConfigError('DNS forwarding "dns64-prefix" must be /96')
+
if ('authoritative_zone_errors' in dns) and dns['authoritative_zone_errors']:
for error in dns['authoritative_zone_errors']:
print(error)