The plugin use smnp_get: in the source of check_smn you use the command smnp_get which you have in the system installed. The problem is the plugin because if you use smnp_get the result is correct. I always got the garbled characters when used the plugin
-- check_snmp behaviour has changed, garbled output https://launchpad.net/bugs/52587 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs