The libnetcfg utility can be used to configure the libnet.  Starting
       from perl 5.8 libnet is part of the standard Perl distribution, but the
       libnetcfg can be used for any libnet installation.

       Without arguments libnetcfg displays the current configuration.

           $ libnetcfg
           # old config ./libnet.cfg
           daytime_hosts        ntp1.none.such
           ftp_int_passive      0
           inet_domain          none.such
           nntp_hosts           nntp.none.such
           pop3_hosts           pop.none.such
           smtp_hosts           smtp.none.such
           test_exist           1
           test_hosts           1
           time_hosts           ntp.none.such
           # libnetcfg -h for help

       It tells where the old configuration file was found (if found).

       The "-h" option will show a usage message.

       To change the configuration you will need to use either the "-c" or the
       "-d" options.

       The default name of the old configuration file is by default
       "libnet.cfg", unless otherwise specified using the -i option, "-i
       oldfile", and it is searched first from the current directory, and then
       from your module path.

       The default name of the new configuration file is "libnet.cfg", and by
       default it is written to the current directory, unless otherwise
       specified using the -o option, "-o newfile".

       Net::Config, libnetFAQ

       Graham Barr, the original Configure script of libnet.

       Jarkko Hietaniemi, conversion into libnetcfg for inclusion into Perl

perl v5.18.2                      2017-11-10                      LIBNETCFG(1)
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