[aprssig] DNS for APRSIS Servers
esarfl at gmail.com
Thu Feb 19 12:36:24 EST 2015
On Thu, Feb 19, 2015 at 5:33 AM, Jason KG4WSV <kg4wsv at gmail.com> wrote:
> On Wed, Feb 18, 2015 at 9:58 PM, Max Harper <kg4pid at yahoo.com> wrote:
> > Is someone messing around with the DNS entries for the aprsis server
> > T2TEXAS?
> > I ask because my igate only knows about one server "texas.aprs2.net" but I
> > am currently connected to "iad.aprs2.net".
> Don't know, but juggling DNS records is a method of dealing with
> outages, so there may be some very good sysadmin type reasons that
> you're seeing this.
Jason is right. The Tier2 DNS entries are controlled by an automated
monitoring system. If a problem is detected with a server, the DNS
entry will be pointed at rotate.aprs2.net. The servers in
rotate.aprs2.net are also chosen automatically based on eligibility
Off the top of my head, these reasons could cause a server to be
removed from DNS:
- Status page (:14501) not reachable
- Filter port 14580 not acknowledging connections
- No route to host (layer 3)
- Too many users, no open slots
- No uplink connection
- Server sysop marked their server "out of service" for maintenance in
Assuming all the previous tests pass, these are the additional scoring
criteria for inclusion in rotate.aprs2.net:
- Round trip time (ping) to server
- Uplink has been stable for more than 15 minutes
- No unplanned downtime in the last 3 days
- Number of available connection slots
These tests are done every five minutes from three
You can see the results of the tests here:
Red rows are server errors.
Blue rows are servers included in rotate.aprs2.net.
Blue server names are included in a regional rotate, like noam.aprs2.net.
Yellow indicates a server is down for planned maintenance.
This system is all open source, written by Hessu:
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