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[NOAAPORT #BGK-918302]: NOAAPort ingest not working

Hi,

I moved this inquiry into our NOAAPort support department since it is
not related to the previous ldm-mcidas inquiry.

re:
> Most of our LDM problem in porting to new machines are resolved.

Very good.

re:
> The only problem is NOAA port. I configured the NOAA port, created the
> routes and ldmd.log is showing running, but there is FIFO empty message.

I would not expect any FIFO empty messages.

re:
> I
> listened the eth where the port is connected and data is flowing but there
> is an err or, which is bad UDP packet size 4032 > 1472. I am assuming
> the 1472 comes from the eth MTU minus the ipv4 header (20) + UDP head
> (8). As per ldm configuration manual, I set the ipv4 fragmentation to
> 4096 but the problem still persists.

Our recommendation is to set the following in /etc/sysctl.conf:

# Disable IPv6
net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1

#
# Enable DVBS reception
#
net.ipv4.conf.default.rp_filter = 2

#
# DVBS multicast fragment reassembly 
#
net.ipv4.ipfrag_max_dist = 0

The bad UDP packet size messages are typically an indication that the version of
'tcpdump' being used is old/out of date.  However, the last interaction we had
with a user trying to get their NOAAPort ingest working and seeing bad UDP
length messages showed that their tcpdump was current/up to date, and should
not have shown bad UDP packet lengths.  They were trying to get their NOAAPort
ingest running under CentOS 7.x.  After trying a LOT of different things, they
dropped back to using CentOS 6.10, and all of their problems went away.

Questions:

- what OS/version are you using?

- what version of 'tcpdump' are you using?

- did you make sure that the firewall on your machine was configured to
  allow all traffic from the Ethernet interface that your Novra S300N
  (I assume you are using a Novra S300N) is connected to?

  This has tripped up a number of sites setting up NOAAPort ingest.

- what does your routing look like

  The easiest way to answer this is to send us the output from
  'netstat -rn'.

- what are your LDM configuration file, ~ldm/etc/ldmd.conf, entries for
  running NOAAPort ingest?

  Ours look like:

# 20170313 - changed set of noaaportIngester instances to match:
#            
http://www.nws.noaa.gov/noaaport/document/Multicast%20Addresses%201.0.pdf
#            CHANNEL PID MULTICAST ADDRESS Port DETAILS
#            NMC     101     224.0.1.1     1201 NCEP / NWSTG
#            GOES    102     224.0.1.2     1202 GOES / NESDIS
#            NMC2    103     224.0.1.3     1203 NCEP / NWSTG2
#            NOPT    104     224.0.1.4     1204 Optional Data - OCONUS Imagery 
/ Model
#            NPP     105     224.0.1.5     1205 National Polar-Orbiting 
Partnership / POLARSAT
#            EXP     106     224.0.1.8     1208 Experimental
#            GRW     107     224.0.1.9     1209 GOES-R Series West
#            GRE     108     224.0.1.10    1210 GOES-R Series East
#            NWWS    201     224.1.1.1     1201 Weather Wire
#
exec    "noaaportIngester -n -m 224.0.1.1  -l /data/tmp/nwstg.log"
exec    "noaaportIngester -n -m 224.0.1.2  -l /data/tmp/goes.log"
exec    "noaaportIngester -n -m 224.0.1.3  -l /data/tmp/nwstg2.log"
exec    "noaaportIngester -n -m 224.0.1.4  -l /data/tmp/oconus.log"
exec    "noaaportIngester -n -m 224.0.1.5  -l /data/tmp/nother.log"
exec    "noaaportIngester -n -m 224.0.1.8  -l /data/tmp/nother.log"
exec    "noaaportIngester -n -m 224.0.1.9  -l /data/tmp/nother.log"
exec    "noaaportIngester -n -m 224.0.1.10 -l /data/tmp/nother.log"

- are the permissions on LDM executables correct?

  There are 4 routines in an LDM build that must have setuid root
  privilege:

-rwsr-xr-- 1 root ustaff  60025 May 14 19:10 ldmd
-rwsr-xr-- 1 root ustaff  11460 May 14 19:10 hupsyslog
-rwsr-xr-- 1 root ustaff 407007 May 14 19:10 noaaportIngester
-rwsr-xr-- 1 root ustaff 324768 May 14 19:10 dvbs_multicast

  Does your build have the correct permissions for these routines?
  Please send the output of:

  <as 'ldm'>
  cd ~ldm
  ls -alt bin/

re:
> Could you please help on that?

Sure, but we are going to need information about your system in order to
troubleshoot.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: BGK-918302
Department: Support NOAAPORT
Priority: Normal
Status: Closed
===================
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