On 26/06/06, Thaths <[EMAIL PROTECTED]> wrote:
> On 6/25/06, Ajitabh Pandey <[EMAIL PROTECTED]> wrote:
> > # Allow NTP traffic through
> > $IPT_CMD --append INPUT -p udp --sport 123 --dport 123 --jump ACCEPT
> > # Allow NTP traffic through
> > $IPT_CMD --append OUTPUT -p udp --sport 123 --dport 123 --jump ACCEPT
>
> Do not specify both sport and dport. Instead make these into four
> lines - 2 for sport and 2 for dport. Make sure one of them is for the
> INPUT chain and the other is for OUTPUT chain.

I believe NTP works like DNS - both the client and server binds on
(UDP) port 123. If both sport and dport are not 123, chances are that
it is not legitimate traffic.

Binand

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