Dave Shield wrote: > On 27 May 2012 08:46, Jan Willamowius <j...@willamowius.de> wrote: > > The Unix implementation of the agent uses Net-SNMP and sets the OID as > > type ASN_UNSIGNED. When I look at the GET response with Wireshark, it > > decodes it as a "Gauge32" value. That made sense at first sight, > > because according to RFC 1902 Unsigned32 and Gauge32 are the same. > > > > The Windows implementation is based on Windows' SnmpAPI.lib and sets > > the OID as ASN_UNSIGNED32 and when I look at the GET response with > > Wireshark, it decodes it as "Unsigned32". That looks even better to me. > > > > How come the 2 implementations produce different results on the wire ? > > First question - are they actually different, > or are they simply being reported differently?
They actually are slighly different. > The Net-SNMP tools support a '-d' flag, to display the raw > packet dumps. Try sending a simple query to the two agents > using this option, and compare the two dumps. > > What do they look like? >From Net-SNMP based agent: (decoded as Gauge32 by Wireshark) Received 48 byte packet from UDP: [192.168.1.189]:161->[0.0.0.0]:54767 0000: 30 2E 02 01 01 04 06 70 75 62 6C 69 63 A2 21 02 0......public¢!. 0016: 04 7A CB 78 0E 02 01 00 02 01 00 30 13 30 11 06 .zËx.......0.0.. 0032: 0C 2B 06 01 04 01 81 DA 22 0B 01 03 00 42 01 00 .+.....Ú"....B.. .1.3.6.1.4.1.27938.11.1.3.0 = Gauge32: 0 >From the Windows agent: (decoded as Unsigned32 by Wireshark) Received 48 byte packet from UDP: [192.168.1.100]:161->[0.0.0.0]:40864 0000: 30 2E 02 01 01 04 06 70 75 62 6C 69 63 A2 21 02 0......public¢!. 0016: 04 6A 67 E6 37 02 01 00 02 01 00 30 13 30 11 06 .jgæ7......0.0.. 0032: 0C 2B 06 01 04 01 81 DA 22 0B 01 03 00 47 01 00 .+.....Ú"....G.. .1.3.6.1.4.1.27938.11.1.3.0 = 0 As you can see, the packets are slighly different. Regards, Jan -- Jan Willamowius, j...@willamowius.de, http://www.gnugk.org/ ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Net-snmp-users mailing list Net-snmp-users@lists.sourceforge.net Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users
