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snmpwalk -u public -A 123456789 -a MD5 -X 123456789 -x DES -l noAuthNoPriv -v3 -e 80003a8c0431323334
Timeout: No Response from

v3 err: 3 unknown engine id

the engine-id field holds the suffix value of engine-id, usually, SNMP clients should be able to detect the value, as SNMP values, as read from the router. However, there is a possibility that this is not the case. In which case, the engine-ID value has to be set according to this rule: + , so as an example, if you have set 1234 as suffix value you have to provide 80003a8c04 + 31323334, combined hex (the result) is 80003a8c0431323334