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[aprssig] Periodic Disconnects from APRS-IS

AE5PL Lists HamLists at ametx.com
Thu Jan 18 12:45:49 UTC 2007

rotate.aprs.net is good if your client doesn't support automatic
rotation.  If, however, your client does support automatic rotation, I
recommend that you specify each of the servers individually.
Round-robin DNS is not as dynamic as what would appear because of
operating system inconsistencies (caching algorithms) and the fact that
a round-robin DNS gives out the next IP on its list on each request.

To demonstrate this last issue, let's assume three IPs for
rotate.aprs.net.  If your PC asks for an IP address for rotate.aprs.net,
you get whichever one is up next in the list.  Now, if your PC asks
again at a multiple of 3 total requests to the DNS server, you get the
same IP address.  Pseudo-random but a 33% chance you will get the same
IP address again.


Pete Loveall AE5PL
pete at ae5pl.net

> -----Original Message-----
> From: Andrew Rich
> Posted At: Thursday, January 18, 2007 6:36 AM
> Subject: RE: [aprssig] Periodic Disconnects from APRS-IS
> What is wrong with roatate.aprs.net 14580
> You get dynamic assignment of a server, and you just get what you ask
> for in
> the stream.
> That to me seems the best solution.

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