[ntp:questions] Re: time.ucla.edu is closed
Wolfgang S. Rupprecht
wolfgang+gnus20060903T232205 at dailyplanet.dontspam.wsrcc.com
Mon Sep 4 06:36:07 UTC 2006
Felix Tilley <fetilley at cyberbromo.int> writes:
> I don't know if NTP uses TCP, UDP or both. All I know is time.ucla.edu
> does not respond to ntpdate (Linux version). This started a few days ago.
I think you might want to use something other than nmap to test that
they closed the server. Nmap for 123/tcp will fail because ntp
doesn't use tcp. Nmap for 123/udp probably won't give any meaningful
output either. The nmap test for udp just tells you if talking to the
port causes an ICMP port-unreachable to be sent. If it is filtered by
a firewall that drops 123/udp then nmap will claim the port is "open".
If ntp is running but ignoring non-approved hosts, then nmap similarly
will claim it is "open".
Personally, I used "ntpdate -d" to see if a host is answering. ;-)
<I guess I should duck and run now...>
Wolfgang S. Rupprecht http://www.wsrcc.com/wolfgang/
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