Thank you so much for the reply, the command i'm using is the following:
snmpset -v 2c -c public "IP" "OID" = -100
Watching the data over wireshark tho, the data length for that command is 1.
But if i send for example -130 i get a data length of 2.
> Il 27 giugno 2017 alle 16.51 Bill Fenner <fen...@gmail.com> ha scritto:
>
> On Thu, Jun 22, 2017 at 10:37 AM, corvace.fabrizio--- via Net-snmp-users
> <net-snmp-users@lists.sourceforge.net
> mailto:net-snmp-users@lists.sourceforge.net > wrote:
>
> > >
> > Hello,
> >
> > I'm currently struggling with a data problem.
> >
> > I have a system where i have to SET a value, the value is of type
> > Integer (-32768.32767).
> >
> > When sending a value over 255 i have no problem with sign, if i
> > scan with wireshark i see a transmission of ASN type 2(Integer) with 2
> > bytes of data, and the data is correctly sent with sign.
> >
> > But whenever i try to send a value that is less that 256, therefore
> > fits in a byte, the transmission is still of type 2, but it sends out one
> > single byte of data, thus cutting out the range from -129 to -255 and from
> > +128 to +255.
> >
> > I would have thought that since the OID is of type Integer
> > (explicitly 16bit) the data would still have been sent as 2bytes.
> >
> > > BER encoding is variable length, no matter what the restrictions
> > on the range of the integer - restrictions like that are managed at a
> > higher layer.
>
> As you surmise, the BER encoding of values from -129 to -255 and +128 to
> +255 are two bytes long.
>
> > >
> > I tried looking for a way of forcing 2 byte data send, but with no
> > luck. Am i missing something?
> >
> > > How are you sending your data? I do not know of a way to force
> > net-snmp to behave in this incorrect way.
>
> Bill
>
>
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