On 2007-11-17 07:13:02 -0500, Hector Santos wrote: > Also, from what I have seen, top ISPs are also well below 30 mins 2nd > retry. In fact for Bellsouth.net, it has a 5 minute 2nd retry. But AT&T > took them over, so lets see what att.net servers are doing. ..... Yup, > exactly 5 mins 2nd retry which is what I saw (<30 mins) by the majority > when I was looking at the time. > > IMO, 30 minutes is really too high and IMO, it corresponds to the good > old days of less reliable machines, more down systems, less reliable > connections, slower bandwidths, less scaled systems, etc, etc. But not > today. With high performance machines, multi-threading software, Virtual > Machines, higher bandwidths, better scaling, more challenge/response > systems, etc, may suggest the x821 30 minute retry "guideline" is > outdated. :-)
I would agree with that. Temporary error conditions (real or simulated)
which are fixed in far less than 30 minutes are rather frequent these
days, and combining a short initial delay of a few minutes with an
exponential backoff to an upper limit of a few hours seems to be rather
common.
hp
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