Hi. On Tue, 28 Jan 2014 13:43:17 +0800 lina <lina.lastname@gmail.com> wrote: > Hi, > > I read something online, and wonder: > 1] shall I close the port 123 Probably you should, unless you're providing ntp to some other hosts. > 2] disable ipv6 Is there something malfunctioning on this host? Or is there any service that misbehaves with ipv6? Reco