On Sun, Nov 30, 2008 at 10:44 AM, Teco Boot <[EMAIL PROTECTED]> wrote: > With map&encap and larger ntp polling intervals, what about jitter / delay / > asymmetry / packet loss? > > Recent postings suggest drop the first packet during map lookup. Oeps!!!! > I think first packet delivery is a MUST.
Hi Teco, We went through this before nearly a year ago. The short version is that the jitter at the cache duration boundary will impact that ntp session regardless of whether you keep or drop the packet. Solutions include: 1. TRRP style: place the NTP daemons that will communicate out over the internet on bare (non-upgraded) addresses and sync the map-encap machines to those nearby ntp servers. 2. Any pull-cache: modify the NTP software so that it ignores out-of-bounds answers when it hasn't sent a packet in a while and tries again a few seconds later. Regards, Bill Herrin -- William D. Herrin ................ [EMAIL PROTECTED] [EMAIL PROTECTED] 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004 _______________________________________________ rrg mailing list [email protected] https://www.irtf.org/mailman/listinfo/rrg
