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CWOP Tier 2 Servers Have Withdrawn

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tinplate:
After doing some research into the DNS topic, I think that changing your windows DNS caching setting may be unnecessary. It turns out that the setting is just the maximum caching period. The DNS record itself has its own cache period (called the TTL - time to live). Windows uses the smaller of the two. Right now, rotate.aprs.net has a TTL of 60 seconds. That means that if you are uploading your CWOP data every 5 minutes, windows will hit the DNS server to resolve the address every time you do a CWOP upload. I've tested this out, and I get the same results (i.e. I don't get stuck hitting a single server) whether I have a short period set in windows or a long period. You still may hit the same server a few times in a row because right now there are only two servers in the core rotation (first and third).

By contrast, the tier 2 rotation has a TTL of 2400 seconds (40 minutes), so that is likely why it looked like you got stuck on a single server using that rotation.

wuhu_software:

--- Quote from: "tinplate" ---After doing some research into the DNS topic, I think that changing your windows DNS caching setting may be unnecessary. It turns out that the setting is just the maximum caching period. The DNS record itself has its own cache period (called the TTL - time to live). Windows uses the smaller of the two. Right now, rotate.aprs.net has a TTL of 60 seconds. That means that if you are uploading your CWOP data every 5 minutes, windows will hit the DNS server to resolve the address every time you do a CWOP upload. I've tested this out, and I get the same results (i.e. I don't get stuck hitting a single server) whether I have a short period set in windows or a long period. You still may hit the same server a few times in a row because right now there are only two servers in the core rotation (first and third).

By contrast, the tier 2 rotation has a TTL of 2400 seconds (40 minutes), so that is likely why it looked like you got stuck on a single server using that rotation.
--- End quote ---



Thanks for the detailed response. I see why this is a non-issue.

Too bad that answer could have not been posted in the QC list!

daveh:
Hi Everyone,

Seems the word is out on this Forum concerning the Citizen Weather Observer Program (CWOP) recommended server list, but I'll restate the list anyway...

In order to enhance network stability and increase the potential of your weather reports getting to NOAA, we (Russ and I) are recommending everyone use the following server to send data to CWOP:
Default Server:  rotate.aprs.net                        Port: 14580

Alternative Servers:
Server Name:   first.aprs.net                           Port: 14580
Server Name:   second.aprs.net                      Port: 14580
Server Name:   third.aprs.net                          Port: 14580
Server Name:   fifth.aprs.net                           Port: 14580

Please check the following CWOP links to see the latest info:
CWOP News: http://www.wxqa.com/news.html
CWOP Server List:  http://www.wxqa.com/activecwd.html

Please contact me if you have any questions,

DaveH
CW0351
dave@cwop.info

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