A lot of Connection from UDP

Hi,
I noticed in the syslog of my server that there are many udp connections in a short time, is this normal in your opinion?

Thank you

Here the logs:

Nov 16 12:42:42 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:34391->[$IP_MONITORED_HOST]:161

Nov 16 12:42:42 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:34391->[$IP_MONITORED_HOST]:161
Nov 16 12:42:42 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:47832->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:47832->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:43374->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:43374->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:40390->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:40390->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:40416->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:40416->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:52302->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:52302->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:47390->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:47390->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:39327->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:39327->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:57981->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:57981->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:39053->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:39053->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:55160->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:55160->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:39570->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:39570->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:51014->[$IP_MONITORED_HOST]:161
Nov 16 12:42:43 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:51014->[$IP_MONITORED_HOST]:161
Nov 16 12:42:44 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:52538->[$IP_MONITORED_HOST]:161
Nov 16 12:42:44 $Host snmpd[17513]: Connection from UDP: [$IP_CHECKMK_SERVER]:52538->[$IP_MONITORED_HOST]:161
Nov 16 12:42:51 $Host snmpd[17513]: error on subcontainer ‘ia_addr’ insert (-1)

Yes, this is normal. Checkmk uses SNMP bulkwalk to query all known OIDs at once.

Thanks for your reply, but can all these requests can cause bandwidth overload?

No, SNMP is quite bandwidth efficient.