Consistent snmpget return value?

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
.+.........@.(.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
.+.........@.(.x
0048: 0B 40 04 C0  A8 F8 0B                                 .@.....

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
.+.........@.(.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
.+.........@.(.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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