> My understanding is: > - The router's WAN address can and does change. > - The PC's address should not change as long as it is switched on
I'm not sure it's really advisable to assume the second of the above points. On the cable modem system at my home, the host that is connected directly to the cable modem could very possibly get a different IP address when the lease runs out -- and I assume many ISP's offering only dynamic addresses (or static addresses for an extra fee) may change the address gratuitously on a new lease, just to emphasize that they can. Obviously, a host which is stuck with using a dynamic IP address in such a situation won't be of much use as a server to the outside world -- but if ntpd is syncing to external servers, it really needs to be able to use whatever address happens to be assigned to a NIC at any given time. And yes, I realize that many cable or DSL modems (unlike the one given to me for use at my home) have a builtin NAT router/firewall that will shield a user's computer from external address changes -- but this shouldn't be assumed if it doesn't have to be. In my own case, I sidestepped the problem by arranging for a static IP address (which my ISP gave me at no extra charge) -- but not everyone may be able to do this. -- Rich Wales / ri...@richw.org / ri...@stanford.edu Wikipedia: http://en.wikipedia.org/wiki/User:Richwales Facebook: http://www.facebook.com/richwales _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
