Good morning from Tier 2 headquarters in sunny southern California! I<br>
would like to take this time to outline some important<br>
changes/enhancements to the APRS Tier 2 server network. The network has<br>
been quietly growing again in the past year. We now have 44 servers<br>
online in 19 different countries, and 8 more servers are currently under<br>
sea trials. A positive benefit to this growth has been the influx of<br>
great knowledge from the different sysops that has allowed us to make<br>
many enhancements to the network as well.<br>
<br>
Most recently, there was a thread on the APRS SIG regarding rotate<br>
addresses [again]. Most of us at Tier 2 are still firm believers that<br>
if your client software allows you to set one or more server names<br>
manually, then you should always do that before utilizing a round-robin<br>
rotate address, but we also recognize that there are software packages<br>
that do not offer that. There are also folks who will always want the<br>
simple answer, and the rotate addresses to offer a simple, if not the<br>
most effective, connection option. The down sides of round-robin DNS<br>
are well documented, even on these lists, so I wont repeat them.<br>
However, we at Tier 2 recognized early on the desire for regional<br>
association with operations. Based on some recent threads, this seems<br>
to also be true for rotate addresses. For some time now,<br>
<a href="http://rotate.aprs2.net">rotate.aprs2.net</a> has been available as a connection option to Tier 2.<br>
This address keeps a pool of no more than 22 of the Tier 2 servers (to<br>
accommodate some router firmware that will not parse more than 22) and<br>
automatically adjusts for servers that go offline. It is a fairly<br>
effective setup, but some clients have responded that they do not<br>
understand why their UI-View program running in Tuscaloosa is connected<br>
to the APRS server in Thailand. While internet routing vs. political<br>
boundaries is an interesting study, suffice it to say that most clients<br>
will want to connect to something that makes regional sense. So for the<br>
past five months, our sysops have been working on and testing a regional<br>
rotate address system for Tier 2 that addresses many of these issues.<br>
<br>
Based on the packet radio network routing names of several years past,<br>
we have broken down the world into five server regions, and have<br>
assigned servers to those five addresses in those regions. Again, based<br>
on the packet radio routing model, we have created the following five<br>
regional rotate addresses:<br>
<br>
<a href="http://noam.aprs2.net">noam.aprs2.net</a><br>
<a href="http://soam.aprs2.net">soam.aprs2.net</a><br>
<a href="http://euro.aprs2.net">euro.aprs2.net</a><br>
<a href="http://aunz.aprs2.net">aunz.aprs2.net</a><br>
<a href="http://asia.aprs2.net">asia.aprs2.net</a><br>
<br>
Information about which server is in which region, along with a map of<br>
the five server regions, can be found right on the Tier 2 home page<br>
<a href="http://www.aprs2.net">www.aprs2.net</a> There were two debates that ran for a long time in<br>
developing this scheme. First, there are often political questions when<br>
assigning various countries of the world to a region - most notably is<br>
the question of where Europe and Asia are separated. I can assure you<br>
that there was no political or nationalistic malice in choosing where<br>
servers were placed! Simple logic was employed. Secondly, it had been<br>
requested that we try to adhere to strict internet routing - i.e. have<br>
the client connect to the server that was closest in IP terms.<br>
Unfortunately, while that make very good technical sense, there really<br>
is no way to effectively trace and catalog the routes from each<br>
potential client to each of the servers. At any rate, this setup seems<br>
to be working well, and so it is time to roll it out. Again, I still<br>
believe you should be trying to use actual server addresses whenever<br>
possible, but if you are looking for a regional rotate address that<br>
makes more sense to you, you now have it!<br>
<br>
We always welcome comments and suggestions. We serve the APRS-IS's<br>
30,000 plus clients with an average of 1,850 at any given time. This is<br>
your network and we are happy to be the maintenance crew for it. Thanks<br>
again, and enjoy!<br>
<br>
73, on behalf of the Tier 2 team.<br>
Phil Pacier - AD6NH<br>
Tier 2 Network Coordinator<br>
<a href="http://www.aprs2.net">www.aprs2.net</a>