Rules for recognizing received traps are defined on this page.

Rule number simply tells you where you're at on the list of Trap receiver rules. Click "next" and "prev" to scroll through the list. To advance directly to a specific rule, enter the desired number in the "Showing" box, then click Update.

Device number specifies which device on the SNMP Client Devices list this trap will be received from. If traps are received from devices not listed on the Devices page, they will be discarded. Setting device number to zero will result in the rule being removed from the list the next time the configuration file is saved.

If the trap received is a v1 (version 1) trap, you can specify the trap number expected as "a:b" where "a" is the generic trap number (for example, 6 for private enterprise) and "b" is the specific trap number as found in the device's MIB file. Leave this set to 0:0 if no v1 trap number is expected or should be disregarded. (Note: SNMP v2c traps will not have this number, and if trap type is detected as v2c, then this entry will be disregarded.)

The variable name that is expected to be found in the trap should be given as an OID for v2 traps, and optionally for v1 traps. If this OID is not found in the trap message, no further action is taken for this trap rule. If no OID is given, especially for v1 traps, then the trap number alone is enough to qualify this trap, and you should use the Fixed Value as the value to be placed into the result object.

Special case use of Trap Name OID: If the trap is v1 and trap numbers are given, then this OID, if provided, will be used to check the enterprise OID of the trap message received. If the OID is provided in the rule, then it must match the v1 trap enterprise OID before the rule will be considered successful.

Data hint helps the data parser figure out what the varible is. If ASN encoding is recognized as other than an octet string, the hint will be disregarded. If an octet string is found, then the parser needs to know if it should be treated as RFC 6340 floating point. If no hint is given (standard ASN), then the octet string will be treated as an ASCII character string, in which case ASCII to numeric conversion will be attempted automatically if the result object is numeric. Note that standard, well-known ASN types are recognized as well as the NetSnmp ASN type for opaque float.

If a matching variable name is found, and the data parser succeeds in parsing the data value, then it will be placed into the object identified as "Result Object". However, if Fixed Value is checked, then whatever value is entered next to the check box will be placed into the result object just because the variable name was found. In the case of v1 traps, if no OID is given, then the trap number alone is enough to casue the fixed value to be placed into the result object.

Timeout is optional, and will be in effect if a non-zero time in seconds is provided. If given, then the timeout value will be placed into the result object after this amount of time has elapsed since receiving the trap. If another of the same trap is received, the timer will be reset. Only after this time has expired without receiving the trap, but after receiving it at least once, the timeout value is placed into the result object.

Click Update when all entries have been made. After all configuration has been entered, be sure to go to the Config File page and click Save so that changes are retained through power cycles.

To insert or delete trap rules in the table, enter the trap number and click the appropriate button. To add a new rule to the end of the list when already at the end, simply click the Next button at the top.