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[LDM #EWC-270147]: LDM

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  • Subject: [LDM #EWC-270147]: LDM
  • Date: Fri, 22 Sep 2017 11:24:48 -0600
Hi Mike,

re:
> Our backup server is receiving NexRad2 data from unidata, but our primary
> ingest sever is not receiving this data.
> 
> Please allow NR2 data to flow to borg1.ncdc.noaa.gov
> 
> REQUEST NEXRAD2 "^L2-BZIP2/.*" idd.unidata.ucar.edu

This machine is already ALLOWed to REQUEST NEXRAD2 from our top level IDD relay
cluster, idd.unidata.ucar.edu.

Comments:

- a machine's IP address is included in the REQUEST sent to upstream LDMs

- a reverse DNS lookup on the received IP address is made, and then
  the name, if resolution is successful, is used to compare ALLOW
  rules in the upstream's LDM configuration file, ~ldm/etc/ldmd.conf

- we have a rule that ALLOWs machines that resolv to .gov to REQUEST
  feeds from our top level IDD relay, idd.unidata.ucar.edu

- we are not seeing any indication that any of the real server backends
  of our relay cluster are denying connection attempts from borg1's
  IP address, 205.167.25.129 or including its name

Question:

- is it possible that there is a firewall rule at NCDC that is not allowing
  outbound traffic to port 388 on remote machines for borg1?

Cheers,

Tom
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Ticket Details
===================
Ticket ID: EWC-270147
Department: Support IDD
Priority: Normal
Status: Closed
===================
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