Hello, I wonder whether ARP timeouts have a negative effect on NTP performance. By default in Linux ARP entries get expired after 60s, and default NTP minpoll value is 64s. To my understanding this will mean that RTT experienced by NTP peers residing on the same Ethernet segment, is likely to be affected by ARP resolution process, because some NTP packets will be send out by the kernel right away (ARP entry is cached) and sometimes the kernel will need to do ARP resolution first. My guess this should increase jitter seen by NTP peers.
I would like to know whether this was already considered. Unfortunately right now I don't have time to make experiments to measure the effect. Best regards, Alexandre Bezroutchko http://www.gremwell.com/ _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
