Martin Burnicki <[email protected]> wrote: > This is also what Rob has mentioned in another post of this thread, and > I agree with Rob that a one approach could be to specify (and configure > for ntpd) the systematic error due to asymmetry of your internet connection. > > However, this can also be pretty tricky if you have several NTP nodes on > your home network, if all nodes and the inet router are connected to the > same switch. > > For different nodes on you home net there is no asymmetry (thus no time > error), but for each of them who contacts also an external server there > is. And often a specific machine contacts the other internal devices as > well as the external ones via the same own LAN interface. > > So for your internal operation this means: > > - If you specify a fudge time for a specific interface this may be OK > for external servers but yield an error for internal servers, i.e. > exactly the other way round as without compensation. > > - You had indeed to specify a fudge time for servers of which you know > they are outside on the internet, e.g. other pool servers > > > On the other hand, if your local NTP server shall be accessible both for > external pool clients, and local clients, how should you know where a > specific request comes from? Based on the IP address? Only if the local > network and the internet interface are connected via different interfaces? > > So even though it would be good to be able to specify some compensation > values, there should be different ways to do it, and putting all > together in a way that there is no error is tricky.
Well, in my own system I have a different IP address for the internet than I have for my local network. In the bug report I asked for a fudge time1 that could be specified per local IP addres. This would work OK in my case. When you use the same address on a LAN and on internet it is more difficult. I guess this only happens in cases where there is a NAT router that translates requests from internet to a local address. Not a configuration I would recommend when being in the pool anyway. _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
