snmpget, snmpwalk timeout, but response comes

Hi,

I can observe something strange with new UPS equipped with InsightPower
SNMP card. I'm trying monitor it from Debian Etch (kernel 2.6.8) and 
net-snmp apps in version 5.2.3. For example:

[wilku@ns3: ~]$ snmpget -v1 -c plmik01 ups1 system.sysName.0
Timeout: No Response from ups1.

but if I turn on debug mode...

[wilku@ns3: ~]$ snmpget -d -v1 -c plmik01 ups1 system.sysName.0

Sending 44 bytes to UDP: [192.168.1.100]:161
0000: 30 2A 02 01  00 04 07 70  6C 6D 69 6B  30 31 A0 1C    0*.....plmik01 .
0016: 02 04 77 64  4E 5E 02 01  00 02 01 00  30 0E 30 0C    ..wdN^......0.0.
0032: 06 08 2B 06  01 02 01 01  05 00 05 00                 ..+.........


Received 45 bytes from UDP: [192.168.1.100]:161
0000: 30 2B 02 01  00 04 07 70  6C 6D 69 6B  30 31 A2 1D    0+.....plmik01˘.
0016: 02 01 00 02  01 00 02 01  00 30 12 30  10 06 08 2B    .........0.0...+
0032: 06 01 02 01  01 05 00 04  04 55 50 53  31             .........UPS1

As You can see, response came from UPS: 45 bytes with expected string 
"UPS1".

I tried to catch responses with tcpdump:
[root@ns3: ~]# tcpdump -n host ups1
22:03:02.373063 IP 10.197.84.43.38697 > 192.168.1.100.161:  C=plmik01 
GetRequest(28)  .1.3.6.1.2.1.1.5.0
22:03:02.381429 IP 192.168.1.100.161 > 192.168.1.43.38697:  C=plmik01 
GetResponse(29)  .1.3.6.1.2.1.1.5.0="UPS1"

As You can see, answer looks good.

I don't know why snmpget and snmpwalk always give me timeout answer.
I think it's something specific in UPS SNMP card.

What I tried:
- on the same client upgrade snmp apps package to 5.3.1 (form Debian 
Sid) - timeout, but responses are coming

- on the same client download net-snmp-5.4.tar.gz
and compile it myself - timeout, but responses are coming

- on another Debian Etch server - the same problem

- on another Ubuntu station - the same problem

- I installed net-snmp-5.4.0-1.win32.exe on Windows XP - work fine

- I installed net-snmp-5.4.0-1.win32.exe on Windows 2003 Server - work 
fine as well

- I prepared simple Perl script using Net::SNMP on Debian - timeout, but 
  I'm able to catch responses

- set option -t with big value on Debian - it doesn't help

Generally, I can retrieve answer from UPS using net-snmp apps on Win OS,
but I have a problem to do this using net-snmp apps on Linux based OS.

There is no problems with firewalls, LAN, routing and something like that.

Thanks for all Your suggestions.

best regards,
wilku

-- 
Artur WILCZEK <[email protected]>


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