Download the latest version of NTP from http://www.ntp.org/
wget http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2.4p4.tar.gz gunzip ntp-4.2.4p4.tar.gz tar -xvf ntp-4.2.4p4.tar cd ntp-4.2.4p4
./configure make make check (optional) make install
Use command /usr/local/bin/ntpdate ntp.demon.co.uk (or wherever) to set the current time, or create a new file in /etc/cron.daily/
You may wish to add this command to cron.daily so that the time is synchronised automatically every day.
If you have a firewall you will need to amend in order to allow UDB port 123.
For IPCHAINS, the relevant code is:-
ipchains -A input -i eth0 -p udp -d $IPADDRESS 123 -j ACCEPT ipchains -A output -i eth0 -p udp -s $IPADDRESS 123 -j ACCEPT
where $IPADDRESS is defined as the IP address of your server.
For IPTABLES, the relevant code is:-
iptables -A INPUT -p udp -m udp --sport 123 -j ACCEPT iptables -A OUTPUT -p udp -m udp --dport 123 -j ACCEPT
Also check any router or hardware firewall restrictions. You may need to open outgoing UDP port 123.
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