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 >
Because 123/tcp was reserved for NTP at the same time as 123/udp! We've been discussing for years if we should start using 123/tcp for things like configuration and monitoring, where you can get _very_ long replies. The core ntp protocol will never use 123/tcp however. Terje -- - <[EMAIL PROTECTED]> "almost all programming can be viewed as an exercise in caching" _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
