Since debian 6.0.x, the debian package of snmpd has changed,
We do have indeed to download the MIBs manually.
Once you ran
apt-get install snmpd
You then have to run the following to get the MIBS
apt-get install snmp-mibs-downloader
You have to edit your snmpd.conf (/etc/snmp/snmp.conf) and comment out the mibs directive
Then edit /etc/default/snmpd, comment out the MIBDIRS, to export all mibs, if you want you can also select which MIBS you want to export.
# export MIBDIRS=/usr/share/snmp/mibs
This has to be applied for example on a monitoring host like Nagios/Centreon.
Note that if you installed a brand new snpmd, that by defult this is restricted to localhost only, so you have to edit the /etc/snmp/snmpd.conf.
Comment out localhost and uncomment : agentAddress udp:161,udp6:[::1]:161
# Listen for connections from the local system only
# Listen for connections on all interfaces (both IPv4 *and* IPv6)
Then allow a specific host or network which is allowed to pull SNMP info.
#For Localhost rocommunity public localhost
rocommunity sismonsnmp 192.168.0.1
#To allow all a network rocommunity sismonsnmp 192.168.0.0/24