Opsi ntpdate Bagi Pengguna FastNet

Saya membiasakan diri untuk menyelaraskan jam sistem ke server publik di Internet, tapi setiap kali melakukan hal ini ketika tersambung melalui FastNet:

$ sudo ntpdate pool.ntp.org
11 Dec 21:43:57 ntpdate[15025]: no server suitable for synchronization found

hmm, kita coba dengan opsi -u:

$ sudo ntpdate -u pool.ntp.org
11 Dec 21:44:14 ntpdate[15037]: step time server 202.152.241.82 offset 1.243349 sec

dan kalau kita baca manual ntpdate:

-u     Direct ntpdate to use an unprivileged port for outgoing packets. 
       This is most useful when behind a firewall that blocks incoming 
       traffic to privileged ports, and you want to synchronise with 
       hosts beyond the firewall. Note that the -d option always uses 
       unprivileged ports.

lalu untuk membuat opsi tersebut default, sunting saja /etc/default/ntpdate:

NTPOPTIONS="-u"

Don't worry, be happy!