NTP security

[Piotr Tarnowski <piotr_tarnowski@wp.pl>]

Hi, 

I've installed NTP daemon on my firewall (with sync to
external machine) and
on all internal machines  (with sync to my firewall). 

I found that this had opend port 123/udp on my firewall,
so now everybody 
from the net can use my machine as a server. 
I have nothing against this as long as this is secure. Is
it ? 

If not can I limit allowed clients somehow ? (I noticed
that DENY
on ipchains to others than my reference external server
limits ntptrace usage).

Best regards,
Piotr Tarnowski


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