[ntp:questions] Is it possible to run ntpd server behind a firewall?

David L. Mills mills at udel.edu
Wed Oct 17 16:03:14 UTC 2007


Shaochun Wang wrote:
> Danny Mayer wrote:
> 
>> Shaochun Wang wrote:
>>
>>> The stupid net administrator of my institute blocked all UDP datagram
>>> in the firewall. I know that NTP uses UDP to do its work, but is it
>>> possible to let ntpd use TCP?
>>
>>
>> No.  You cannot "let" ntpd use TCP. NTP is a UDP-only protocol. Talk to
>> your net admin. Maybe he can set up a NTP server on the firewall.
>>
>> Danny
> 
> 
> But why the following entry exists in /etc/services file?
> 
> ntp             123/tcp                         # Network Time Protocol
> 




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