Hello,
I have a questions about snmpget and the (error) return
codes. In particular I can get a return code 1 or 2 from
the snmpget command depending on whether I load the standard mibs
in /usr/local/share/snmp/mibs. I do not know if this intended.
I'll explain
Take the IP-MIB and ipAdEntAddr in table ipAddrTable.
Doing an snmpget on one of our windows2000 machines
with address 192.168.248.11 gives the following result.
====
snmpget -d -v 1 -c public 192.168.248.11
1.3.6.1.2.1.4.20.1.1.192.168.248.11 ; myerror=$? && echo "error =
"$myerror
Sending 51 bytes to 192.168.248.11
0000: 30 31 02 01 00 04 06 70 75 62 6C 69 63 A0 24 02
01.....public.$.
0016: 04 72 88 18 1D 02 01 00 02 01 00 30 16 30 14 06
.r.........0.0..
0032: 10 2B 06 01 02 01 04 14 01 01 81 40 81 28 81 78
[EMAIL PROTECTED](.x
0048: 0B 05 00 ...
Received 55 bytes from 192.168.248.11
0000: 30 35 02 01 00 04 06 70 75 62 6C 69 63 A2 28 02
05.....public.(.
0016: 04 72 88 18 1D 02 01 00 02 01 00 30 1A 30 18 06
.r.........0.0..
0032: 10 2B 06 01 02 01 04 14 01 01 81 40 81 28 81 78
[EMAIL PROTECTED](.x
0048: 0B 40 04 C0 A8 F8 0B [EMAIL PROTECTED]
IP-MIB::ipAdEntAddr.192.168.248.11 = IpAddress: 192.168.248.11
error = 0
====
ipAdEntAddr is of type IpAddress and each of the numbers
of the address can be in the range 0 to 255.
If I replace the last octet with 256 I get
====
snmpget -d -v 1 -c public 192.168.248.11
1.3.6.1.2.1.4.20.1.1.192.168.248.256 ; myerror=$? && echo "error =
"$myerror
1.3.6.1.2.1.4.20.1.1.192.168.248.256: Unknown Object Identifier (Index
out of range: 256 (ipAdEntAddr))
error = 1
====
The "error == 1" usually means tooBig, which in a sense is
true as 256 is greater than the max allowed value.
If I now disable the MIB lookup I get
====
snmpget -m : -d -v 1 -c public 192.168.248.11
1.3.6.1.2.1.4.20.1.1.192.168.248.256 ; myerror=$? && echo "error =
"$myerror
Sending 52 bytes to 192.168.248.11
0000: 30 32 02 01 00 04 06 70 75 62 6C 69 63 A0 25 02
02.....public.%.
0016: 04 63 51 76 E3 02 01 00 02 01 00 30 17 30 15 06
.cQv.......0.0..
0032: 11 2B 06 01 02 01 04 14 01 01 81 40 81 28 81 78
[EMAIL PROTECTED](.x
0048: 82 00 05 00 ....
Received 52 bytes from 192.168.248.11
0000: 30 32 02 01 00 04 06 70 75 62 6C 69 63 A2 25 02
02.....public.%.
0016: 04 63 51 76 E3 02 01 02 02 01 01 30 17 30 15 06
.cQv.......0.0..
0032: 11 2B 06 01 02 01 04 14 01 01 81 40 81 28 81 78
[EMAIL PROTECTED](.x
0048: 82 00 05 00 ....
Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: iso.3.6.1.2.1.4.20.1.1.192.168.248.256
error = 2
====
This is what I would expect, error == 2, noSuchName, as the OID
is not present.
thanks & regards
Mark Naylor.
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