Difference between revisions of "Ntp"

Revision as of 16:56, 22 September 2018

Network Time Protocol, synchronize local clock to remote.

To user ntpq the firewall should be open for traffic to the localhost.

iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
ip6tables -A INPUT -i lo -j ACCEPT
ip6tables -A OUTPUT -o lo -j ACCEPT

@@ Line 3: / Line 3: @@
 To user ntpq the firewall should be open for traffic to the localhost.
 <syntaxhighlight lang=bash>
-iptables -A INPUT -p all -j ACCEPT -s 127.0.0.1 -d 127.0.0.1
+iptables -A INPUT -i lo -j ACCEPT
-iptables -A OUTPUT -p all -j ACCEPT -s 127.0.0.1 -d 127.0.0.1
+iptables -A OUTPUT -o lo -j ACCEPT
-ip6tables -A INPUT -p all -j ACCEPT -s ::1 -d ::1
+ip6tables -A INPUT -i lo -j ACCEPT
-ip6tables -A OUTPUT -p all -j ACCEPT -s ::1 -d ::1
+ip6tables -A OUTPUT -o lo -j ACCEPT
 </syntaxhighlight>