X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/02d49a713d5be5ce59a7cde9cf2a91c982b2c1e5..refs/heads/master:/national.m4

diff --git a/national.m4 b/national.m4
index d58593a..d7d22b1 100644
--- a/national.m4
+++ b/national.m4
@@ -33,6 +33,11 @@ allowservices inbound tcp \
 allowservices inbound udp \
 	tripe
 
+## We use public NTP servers.
+run ip46tables -A inbound -j ACCEPT \
+	-m state --state ESTABLISHED \
+	-p udp --source-port 123 --destination-port 123
+
 ## Other interesting things.
 dnsresolver inbound
 dnsserver inbound