[wxqc] cwop.aprs.net

[Merton Campbell Crockett]

The primary problem with the CWOP-2 failure yesterday is the response  
that was returned on a connection request.  Something was listening on  
the port and returning a connection refused.  Had a port unreachable  
been returned, the user's application software would have tried one of  
the other addresses.

Merton Campbell Crockett


On 02 Jun 2008, at 06:10:45, Gerry Creager wrote:

> We're working to get better monitoring going, but realize that all  
> three
> dedicated servers already run in professional environments.
>
> As for last evening, CWOP-2 suffered a power supply failure.   
> Although a
> redundant power supply system, it was deemed necessary to replace the
> failed unit.  The box was down for ~1 minute according to the system
> administrator, although I recorded 22 minutes of downtime on my  
> network
> monitoring system.
>
> What we appear to have is a set of ongoing problems that we've  
> discussed
> here before:
> 1.  OS caching DNS lookups?  Don't know, always a possibility.
> 2.  Local routers caching DNS data and not refreshing as needed.
> 3.  ISPs caching DNS and not obeying TTL setting in Bind.
> 4.  Client software not responding to a failure appropriately and
> re-requesting DNS lookup.
>
> The connection request should time out after 30 sec and another server
> should be queried at that point.  That'd be problemmatical if we had
> consistent 30 sec latencies but we shouldn't have that.
>
> I've started investigating a proxy method in place of round-robin DNS
> lookups to direct all clients to a live server on a load-leveling  
> basis.
>  I've not found one I like yet, as most such systems expect the  
> servers
> to be co-located instead of geographically diverse, as we are.  As  
> more
> develops in this area I'll report.
>
> Gerry
>
> Merton Campbell Crockett wrote:
>> You might want to check the status of the system again.  I show it
>> dropping connections starting at 2121z and continuing until 0001z.
>>
>> I defined APRS.NET as a forward zone so its a little hard to tell  
>> if the
>> problem is continuing as its address tends to be at the end of the  
>> list.
>>
>> Merton Campbell Crockett
>>
>>
>>
>> On 01 Jun 2008, at 17:04:18, Ted Lum wrote:
>>
>>> CWOP-2 is back @ Sun Jun 1 16:00:57 UTC 2008
>>>
>>> Ted Lum wrote:
>>>> Yes, CWOP-2 @ Sun Jun 1 13:37:10 UTC 2008. Think its just the  
>>>> service on
>>>> the box.
>>>>
>>>> tim.mcmanus at mac.com wrote:
>>>>
>>>>> I think one of these servers went down again.  Every time a server
>>>>> drops in that rotation, WeatherLink locks up sending data.  It  
>>>>> locked
>>>>> up for 45 minutes this time.
>>>>>
>>>>> Is there a better way to do this?  I think this is the fifth or  
>>>>> sixth
>>>>> time a dead server in the rotation locked up WeatherLink since we
>>>>> changed the URL to cwop.aprs.net.
>>>>>
>>>>>
>>>>> --
>>>>> Tim McManus
>>>>> tim.mcmanus at mac.com
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> wxqc mailing list
>>>>> Post messages to wxqc at lists.gladstonefamily.net
>>>>> To unsubcribe or change delivery options, please go to:
>>>>> http://server.gladstonefamily.net/mailman/listinfo/wxqc
>>>>> To search the archives: http://www.google.com/coop/cse?cx=008314629403309390388%3Aknlfnptih9u
>>>>>
>>>>> The contents of this message are the responsibility of the author.
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>> -- 
>>> This message has been scanned for viruses and
>>> dangerous content by *MailScanner* <http://www.mailscanner.info/>,  
>>> and is
>>> believed to be clean.  
>>> _______________________________________________
>>> wxqc mailing list
>>> Post messages to wxqc at lists.gladstonefamily.net
>>> <mailto:wxqc at lists.gladstonefamily.net>
>>> To unsubcribe or change delivery options, please go to:
>>> http://server.gladstonefamily.net/mailman/listinfo/wxqc
>>> To search the archives:
>>> http://www.google.com/coop/cse? 
>>> cx=008314629403309390388%3Aknlfnptih9u
>>>
>>> The contents of this message are the responsibility of the author.
>>
>> Merton Campbell Crockett
>> m.c.crockett at roadrunner.com <mailto:m.c.crockett at roadrunner.com>
>>
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> wxqc mailing list
>> Post messages to wxqc at lists.gladstonefamily.net
>> To unsubcribe or change delivery options, please go to:
>> http://server.gladstonefamily.net/mailman/listinfo/wxqc
>> To search the archives: http://www.google.com/coop/cse?cx=008314629403309390388%3Aknlfnptih9u
>>
>> The contents of this message are the responsibility of the author.
>
> -- 
> Gerry Creager -- gerry.creager at tamu.edu
> Texas Mesonet -- AATLT, Texas A&M University	
> Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.862.3983
> Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843
> _______________________________________________
> wxqc mailing list
> Post messages to wxqc at lists.gladstonefamily.net
> To unsubcribe or change delivery options, please go to:
> http://server.gladstonefamily.net/mailman/listinfo/wxqc
> To search the archives: http://www.google.com/coop/cse?cx=008314629403309390388%3Aknlfnptih9u
>
> The contents of this message are the responsibility of the author.

Merton Campbell Crockett
m.c.crockett at roadrunner.com