Re: session problems in a snmp application

Rafael Garabato Mon, 05 Sep 2005 07:13:14 -0700

I increased the tcpdump's snaplen as you asked. This time I didn't get the same problem as the time before. Only 2 packets are transmited each time the session is opened. However I noticed that there is a parameter called "usmStatsUnknownEngineIDs.0" that always increments its value untill the Change over. Could this be the problem?

09:22:14.750340 IP 192.168.24.107.32814 > 192.168.24.11.snmp: F=r U= E= C= GetRequest(14)
    0x0000: 4500 005c 0000 4000 4011 88ca c0a8 186b [EMAIL PROTECTED]@......k
    0x0010: c0a8 180b 802e 00a1 0048 b220 303e 0201 .........H..0>..
    0x0020: 0330 1102 047c 0515 7602 0300 ffe3 0401 .0...|..v.......
    0x0030: 0402 0103 0410 300e 0400 0201 0002 0100 ......0.........
    0x0040: 0400 0400 0400 3014 0400 0400 a00e 0204 ......0.........
    0x0050: 54f2 4b91 0201 0002 0100 3000            T.K.......0.
09:22:14.762372 IP 192.168.24.11.snmp > 192.168.24.107.32814: F= U= E= 0x800x000x070xE50x040x220x4C0x6F0x760x650x5F0x6D0x650x5F0x740x650x6E0x640x650x720x5F0x6C0x6F0x22 C= Report(32) S:snmpUsmMIB.usmMIBObjects.usmStats.usmStatsUnknownEngineIDs.0=4
    0x0000: 4500 00a9 0000 4000 4011 887d c0a8 180b [EMAIL PROTECTED]@..}....
    0x0010: c0a8 186b 00a1 802e 0095 44f6 3082 0089 ...k......D.0...
    0x0020: 0201 0330 8200 1002 047c 0515 7602 0205 ...0.....|..v...
    0x0030: c004 0100 0201 0304 2c30 8200 2804 1880 ........,0..(...
    0x0040: 0007 e504 224c 6f76 655f 6d65 5f74 656e ...."Love_me_ten
    0x0050: 6465 725f 6c6f 2202 0101 0203 0386 3904 der_lo".......9.
    0x0060: 0004 0004 0030 8200 4004 1880 0007 e504 [EMAIL PROTECTED]
    0x0070: 224c 6f76 655f 6d65 5f74 656e 6465 725f "Love_me_tender_
    0x0080: 6c6f 2204 00a8 8200 2002 0100 0201 0002 lo".............
    0x0090: 0100 3082 0013 3082 000f 060a 2b06 0106 ..0...0.....+...
    0x00a0: 030f 0101 0400 4101 04                   ......A..

#####################################################################################################
09:22:20.193405 IP 192.168.24.107.32815 > 192.168.24.11.snmp: F=r U= E= C= GetRequest(14)
    0x0000: 4500 005c 0000 4000 4011 88ca c0a8 186b [EMAIL PROTECTED]@......k
    0x0010: c0a8 180b 802f 00a1 0048 b220 303e 0201 ...../...H..0>..
    0x0020: 0330 1102 047c 0515 7a02 0300 ffe3 0401 .0...|..z.......
    0x0030: 0402 0103 0410 300e 0400 0201 0002 0100 ......0.........
    0x0040: 0400 0400 0400 3014 0400 0400 a00e 0204 ......0.........
    0x0050: 54f2 4b95 0201 0002 0100 3000            T.K.......0.
09:22:20.205322 IP 192.168.24.11.snmp > 192.168.24.107.32815: F= U= E= 0x800x000x070xE50x040x220x4C0x6F0x760x650x5F0x6D0x650x5F0x740x650x6E0x640x650x720x5F0x6C0x6F0x22 C= Report(32) S:snmpUsmMIB.usmMIBObjects.usmStats.usmStatsUnknownEngineIDs.0=5
    0x0000: 4500 00a9 0000 4000 4011 887d c0a8 180b [EMAIL PROTECTED]@..}....
    0x0010: c0a8 186b 00a1 802f 0095 39f5 3082 0089 ...k.../..9.0...
    0x0020: 0201 0330 8200 1002 047c 0515 7a02 0205 ...0.....|..z...
    0x0030: c004 0100 0201 0304 2c30 8200 2804 1880 ........,0..(...
    0x0040: 0007 e504 224c 6f76 655f 6d65 5f74 656e ...."Love_me_ten
    0x0050: 6465 725f 6c6f 2202 0101 0203 0386 3f04 der_lo".......?.
    0x0060: 0004 0004 0030 8200 4004 1880 0007 e504 [EMAIL PROTECTED]
    0x0070: 224c 6f76 655f 6d65 5f74 656e 6465 725f "Love_me_tender_
    0x0080: 6c6f 2204 00a8 8200 2002 0100 0201 0002 lo".............
    0x0090: 0100 3082 0013 3082 000f 060a 2b06 0106 ..0...0.....+...
    0x00a0: 030f 0101 0400 4101 05                   ......A..

#######################################################################################
09:24:41.570549 IP 192.168.24.107.32815 > 192.168.24.11.snmp: F=r U= E= C= GetRequest(14)
    0x0000: 4500 005c 0000 4000 4011 88ca c0a8 186b [EMAIL PROTECTED]@......k
    0x0010: c0a8 180b 802f 00a1 0048 b220 303e 0201 ...../...H..0>..
    0x0020: 0330 1102 047c 0515 8402 0300 ffe3 0401 .0...|..........
    0x0030: 0402 0103 0410 300e 0400 0201 0002 0100 ......0.........
    0x0040: 0400 0400 0400 3014 0400 0400 a00e 0204 ......0.........
    0x0050: 54f2 4b9a 0201 0002 0100 3000            T.K.......0.
09:24:41.583283 IP 192.168.24.11.snmp > 192.168.24.107.32815: F= U= E= 0x800x000x070xE50x040x220x4C0x6F0x760x650x5F0x6D0x650x5F0x740x650x6E0x640x650x720x5F0x6C0x6F0x22 C= Report(32) S:snmpUsmMIB.usmMIBObjects.usmStats.usmStatsUnknownEngineIDs.0=3
    0x0000: 4500 00a8 0000 4000 4011 887e c0a8 180b [EMAIL PROTECTED]@..~....
    0x0010: c0a8 186b 00a1 802f 0094 dda9 3082 0088 ...k.../....0...
    0x0020: 0201 0330 8200 1002 047c 0515 8402 0205 ...0.....|......
    0x0030: c004 0100 0201 0304 2b30 8200 2704 1880 ........+0..'...
    0x0040: 0007 e504 224c 6f76 655f 6d65 5f74 656e ...."Love_me_ten
    0x0050: 6465 725f 6c6f 2202 0101 0202 026c 0400 der_lo"......l..
    0x0060: 0400 0400 3082 0040 0418 8000 07e5 0422 [EMAIL PROTECTED]"
    0x0070: 4c6f 7665 5f6d 655f 7465 6e64 6572 5f6c Love_me_tender_l
    0x0080: 6f22 0400 a882 0020 0201 0002 0100 0201 o"..............
    0x0090: 0030 8200 1330 8200 0f06 0a2b 0601 0603 .0...0.....+....
    0x00a0: 0f01 0104 0041 0103                      .....A..

Remember also that I have the timeout problem when I execute the "snmp_synch_response" function.

Thanks,
               Rafael

On 9/2/05, Thomas Anders <[EMAIL PROTECTED]> wrote:

Rafael Garabato wrote:
> I included the output of tcpdump.

Please increase tcpdump's snaplen to capture *whole* SNMP packets. Use
"tcpdump -s0 ..." and repost the output.

+Thomas

--
Thomas Anders (thomas.anders at blue-cable.de)

Re: session problems in a snmp application

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