i downloaded and install the latest plugin - nagios-plugins-1.4.3.
i got the same error when running check_dhcp in the libexec directory, ie
DHCP socket: 3
Error: if_nametoindex error - Device not configured.
however when checking through through the web it show
"Return code of 126 is out of bounds - plugin may be missing" instead
any advice on this? is the plugin error? or something need to be done at nagios configurations files??