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[LDM #GUQ-669331]: Both Radar and Satellite feeds stopped downloading abruptly



John,

> Sorry, I was only wondering if our outbound traffic was being throttled as 
> well.
> 
> From looking at the LDM traffic in Wireshark it looks to me that each packet 
> containing data is acknowledged immediately by my server prior to the next 
> packet being sent by your server.  If that's the case, like normal TCP 
> traffic, the only way throttling would make sense to me is if our border 
> firewall was buffering (i.e. holding) traffic for a period of time before 
> sending it along.  Hard to believe the device would do that, especially for 
> an hour.

It doesn't need to buffer. It likely simply discards incoming TCP packets -- 
simulating network congestion -- and relies on TCP's congestion-control 
mechanism. From the sender's perspective, it just seems like a slow network.

> I just can't see how throttling is an issue here if I'm seeing normal looking 
> traffic during that time.
> 
> At what point in the LDM packet ingest process is "ldmadmin watch" getting 
> it's information?   I don't understand how "ldmadmin watch" isn't outputting 
> anything with a ton of network traffic flowing between our server and yours.

The "ldmadmin watch" command executes the pqutil(1) program, which looks at the 
young-end of the product-queue for newly-inserted products. If no products are 
inserted, then nothing is printed.

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: GUQ-669331
Department: Support LDM
Priority: Normal
Status: Closed
===================
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NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.