snmpget timeout when being run from a script

Hi all!

I have a strange problem. I want to monitor my Synology NAS Device. I
created in snmpd.conf an exec statement for my sample script that has to
run one snmpget and multiply the result by 4 to give me the correct value:

exec synology_disk_usage /opt/bin/bash /usr/bin/diskusage.sh

And the script looks like

- -
#!/opt/bin/bash

value=`snmpget -v 1 -c public localhost
HOST-RESOURCES-MIB::hrStorageSize.33 -O Qve`
echo "$value * 4" | bc
- -

When I run it just from the shell then everything looks good:

- -
bash-3.2# /usr/bin/diskusage.sh
956787604
- -

But when I make an snmpwalk then the OID that should take the value out of
the script gets snmp timeout:

- -
bash-3.2# snmpwalk -v 1 -c public localhost .1.3.6.1.4.1.2021.8.1
iso.3.6.1.4.1.2021.8.1.1.1 = INTEGER: 1
iso.3.6.1.4.1.2021.8.1.2.1 = STRING: "synology_disk_usage"
iso.3.6.1.4.1.2021.8.1.3.1 = STRING: "/opt/bin/bash"
Timeout: No Response from localhost
- -

The problem must be related to the snmpget because when I comment the
snmpget in script, and for example add line

value=123

then the snmpwalk show me correct value (123 multiplied by 4). Any ideas
why this can occcur? I am fighting with it since yesterday and I have no
idea why is that.

Regards,
Krzysztof!

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