Re: [noaaport] noaportIngester does not read incoming data

Problem resolved. The solution is to undo reverse path filtering fix in the recent release of Centos 6. Reference: 
http://www.linuxquestions.org/questions/linux-networking-3/multicast-recv-not-working-on-centos-6-2-but-fine-on-cenos-5-7-a-4175412119/

George

On 06/11/2015 05:45 PM, Steve Emmerson wrote:

George,
The tcpdump(1) output indicates that UDP packets are being multicast to address 224.0.1.3. The LDM configuration-file, however, doesn't execute a program that listens to that address.
Incidentally, the "-x" (debug) option will likely result in too much logging. 

Regards,
Steve Emmerson
On Thu, Jun 11, 2015 at 10:57 AM, George Trojan <george.trojan@xxxxxxxx <mailto:george.trojan@xxxxxxxx>> wrote: 

    It must be something stupid, but I am lost...

    Installed ldm-6.12.14 on Centos 6.6. Novra box sends data:

    # tcpdump -i eth1 -nn
    16:37:34.094084 IP 10.0.9.54.38135 > 224.0.1.3.1203: UDP, length 4032
    16:37:34.094286 IP 10.0.9.54 > 224.0.1.3 <http://224.0.1.3>: udp
    16:37:34.094390 IP 10.0.9.54 > 224.0.1.3 <http://224.0.1.3>: udp
    16:37:34.094539 IP 10.0.9.54.38135 > 224.0.1.3.1203: UDP, length 4032
    16:37:34.094674 IP 10.0.9.54 > 224.0.1.3 <http://224.0.1.3>: udp
    16:37:34.094825 IP 10.0.9.54 > 224.0.1.3 <http://224.0.1.3>: udp
    ^C
    # ifconfig eth1
    eth1      Link encap:Ethernet  HWaddr 00:25:B3:E2:5E:4E
              inet addr:10.0.5.12  Bcast:10.0.5.255 Mask:255.255.255.0
              inet6 addr: fe80::225:b3ff:fee2:5e4e/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500 Metric:1
              RX packets:151147 errors:0 dropped:0 overruns:0 frame:0
              TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:40382553 (38.5 MiB)  TX bytes:734 (734.0 b)

    In ldmd.conf I have:
    # NMC
    EXEC    "noaaportIngester -x -b 8096 -m 224.0.1.1 -u 1"
    # GOES
    #EXEC   "noaaportIngester -n -b 8096 -m 224.0.1.2 -u 2"
    EXEC    "dvbs_multicast -x -m 224.0.1.2"
    EXEC    "readnoaaport -m 224.0.1.2 -u 2"

    After starting ldm the only entries in the log files are:
    # tail ldmd.log
    Jun 11 16:42:20 dvb1-aawu ldmd[12831] NOTE: Starting Up (version:
    6.12.14; built: Jun 10 2015 17:34:55)
    Jun 11 16:42:20 dvb1-aawu ldmd[12831] NOTE: Using local address
    0.0.0.0:388 <http://0.0.0.0:388>
    Jun 11 16:42:20 dvb1-aawu dvbs_multicast[12834] DEBUG:
    shmfifo_create(): Got semaphore: pid=12834, semid=393219
    # tail nmc.log
    Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714]
    NOTE:             Number        0
    Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714]
    NOTE:             %             -nan
Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714] NOTE: Full FIFO: 
    Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714]
    NOTE:             Number        0
    Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714]
    NOTE:             %             -nan
Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714] NOTE: Products: 
    Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714]
    NOTE:             Inserted      0
    Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714]
    NOTE:             Mean Rate     0/s
    Jun 11 16:40:55 dvb1-aawu noaaportIngester[12714] NOTE:
    ----------------------------------------
    Jun 11 16:42:20 dvb1-aawu noaaportIngester[12833] DEBUG: Mapping
    2004615168

    Output from strace:
    12833 is noaaportIngester
    # strace -p 12833
    Process 12833 attached - interrupt to quit
    futex(0x7fb9597bc9d0, FUTEX_WAIT, 12837, NULL

    and, for dvb_multicast:
    # strace -p 12834
    Process 12834 attached - interrupt to quit
    recvfrom(4,

    Any hints what should I check? I have noaaport 1.7.1 with
    ldm-6.9.8 getting data from the same Novra receiver.

    George



    _______________________________________________
    noaaport mailing list
    noaaport@xxxxxxxxxxxxxxxx <mailto:noaaport@xxxxxxxxxxxxxxxx>
    For list information or to unsubscribe, visit:
    http://www.unidata.ucar.edu/mailing_lists/