Michael wrote: > Hi, > > I have two problems with my NTP server/client. > > The server & client are linux servers on a private lan. > They are running NTP 4.2.0a > The attached file showing the problem is ntp_nosync.txt > > 1) The client will not sync with the server at all. The server and client > can > communicate perfectly as shown by the output of ntpq. > The server is synced off a local GPS server and is rock steady but the > client > just will not sync to it. I have included the output of tcpdump to show that > the > server and client UDP packets and to my laymans eye they seem fine. > The bd checksum can be ignored as tcpdump is getting the packet before the > checksum is calculated thus showing it as invalid. However, the checksum is > fine at > the receiving end. > > 2) > The client syncs with the server for several minutes then for some reason it > loses sync > only to get it back again within a few minutes. This repeates forever. The > server in this case > is the GPS reference server. Now, if I use burst, the client stays synced > forever, but given that > the tcpdump show no communication problems, why should I need to use it. > > Anyway, any help would be greatly appreciated. Hopefully somebody who > understands the NTP > protocol and algorithms can determine from the tcpdumps what is really > happening. > > I am quite happy to run further tests if asked. > > regards > > > Michael > TCPdump shows a lot of UDP checksum errors. I'd check your hardware.
Danny _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
