HI, I agree with Juergen. You should be seeing that object snmpInASNParseErrs is incremented when you send a negative value for msgMaxSize.
BER uses different rules for encoding lengths, integer values, and the values of sub-IDs of an OID. Regards, /david t. perkins On Mon, 4 Feb 2008, Chun Tian (binghe) wrote: > Hi, J.S. > > Ah... 0xffe3 will be treat as a minus integer... And by recheck ISO/ > IEC 8825-1:2003 (E) (BER encoding), I find this: > > 8.3.2 If the contents octets of an integer value encoding consist of > more than one octet, then the bits of the first octet and bit 8 of the > second octet: > a) shall not all be ones; and > b) shall not all be zero. > NOTE ? These rules ensure that an integer value is always encoded in > the smallest possible number of octets. > > So this is mistake in my BER encode function for integer. > > Sorry for disturbing this mail list. > > Regards, > Chun TIAN (binghe) > > On Feb 4, 2008, at 12:08 PM, Juergen Schoenwaelder wrote: > >> On Sun, Feb 03, 2008 at 11:07:28PM +0000, Dave Shield wrote: >> >>>> What I don't know is why this value must be encoded to a 3-bytes >>>> integer, >>>> not 2-bytes, just like this: >>>> >>>> 0x02, 0x02, 0xff, 0xe3 >>> >>> Because the BER encoding does *not* use 8-bit values. >>> It uses 7-bit values plus a continuation bit. >>> The top-most bit of the first octet of an integer value must >>> *ALWAYS* be 0. >> >> You both get it wrong. The 0x00 byte is required since the value is a >> signed integer. >> >> /js >> >> -- >> Juergen Schoenwaelder Jacobs University Bremen gGmbH >> Phone: +49 421 200 3587 Campus Ring 1, 28759 Bremen, Germany >> Fax: +49 421 200 3103 <http://www.jacobs-university.de/> > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Net-snmp-coders mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/net-snmp-coders > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Net-snmp-coders mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
