omsnmp: SNMP Trap Output Module

Server

This can be a hostname or ip address, and is our snmp target host. This parameter is required, if the snmptarget is not defined, nothing will be send.

Port

The port which will be used, common values are port 162 or 161.

Transport

Defines the transport type you wish to use. Technically we can support all transport types which are supported by NET-SNMP. To name a few possible values: udp, tcp, udp6, tcp6, icmp, icmp6 …

Version

There can only be two choices for this parameter for now. 0 means SNMPv1 will be used. 1 means SNMPv2c will be used. Any other value will default to 1.

Community

This sets the used SNMP Community.

TrapOID

The default value means “ADISCON-MONITORWARE-MIB::syslogtrap”.

This configuration parameter is used for SNMPv2 only. This is the OID which defines the trap-type, or notification-type rsyslog uses to send the trap. In order to decode this OID, you will need to have the ADISCON-MONITORWARE-MIB and ADISCON-MIB mibs installed on the receiver side. Downloads of these mib files can be found here:

https://www.adiscon.org/download/ADISCON-MIB.txt

https://www.adiscon.org/download/ADISCON-MONITORWARE-MIB.txt Thanks to the net-snmp mailinglist for the help and the recommendations ;).

MessageOID

This OID will be used as a variable, type “OCTET STRING”. This variable will contain up to 255 characters of the original syslog message including syslog header. It is recommend to use the default OID. In order to decode this OID, you will need to have the ADISCON-MONITORWARE-MIB and ADISCON-MIB mibs installed on the receiver side. To download these custom mibs, see the description of TrapOID.

EnterpriseOID

The default value means “enterprises.cmu.1.1”

Customize this value if needed. I recommend to use the default value unless you require to use a different OID. This configuration parameter is used for SNMPv1 only. It has no effect if SNMPv2 is used.

SpecificType

This is the specific trap number. This configuration parameter is used for SNMPv1 only. It has no effect if SNMPv2 is used.

Snmpv1DynSource

If set, the source field of the SNMP trap can be overwritten with the a template. The internal default is “%fromhost-ip%”. The result should be a valid IPv4 Address. Otherwise setting the source will fail.

Below is a sample template called “dynsource” which you can use to set the source to a custom property:

set $!custom_host = $fromhost;
template(name="dynsource" type="list") {
     property(name="$!custom_host")
}

This configuration parameter is used for SNMPv1 only. It has no effect if SNMPv2 is used.

TrapType

There are only 7 Possible trap types defined which can be used here. These trap types are:

0 = SNMP_TRAP_COLDSTART
1 = SNMP_TRAP_WARMSTART
2 = SNMP_TRAP_LINKDOWN
3 = SNMP_TRAP_LINKUP
4 = SNMP_TRAP_AUTHFAIL
5 = SNMP_TRAP_EGPNEIGHBORLOSS
6 = SNMP_TRAP_ENTERPRISESPECIFIC