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Net::Config(3perl)               Perl Programmers Reference Guide              Net::Config(3perl)

       Net::Config - Local configuration data for libnet

           use Net::Config qw(%NetConfig);

       "Net::Config" holds configuration data for the modules in the libnet distribution. During
       installation you will be asked for these values.

       The configuration data is held globally in "/etc/perl/Net/libnet.cfg", but a user may
       override any of these values by providing their own. This can be done by having a
       ".libnetrc" file in their home directory. This file should return a reference to a HASH
       containing the keys described below.  For example

           # .libnetrc
               nntp_hosts => [ "my_preferred_host" ],
               ph_hosts   => [ "my_ph_server" ],

       "Net::Config" defines the following methods. They are methods as they are invoked as class
       methods. This is because "Net::Config" inherits from "Net::LocalCfg" so you can override
       these methods if you want.

       requires_firewall HOST
           Attempts to determine if a given host is outside your firewall. Possible return values

             -1  Cannot lookup hostname
              0  Host is inside firewall (or there is no ftp_firewall entry)
              1  Host is outside the firewall

           This is done by using hostname lookup and the "local_netmask" entry in the
           configuration data.

NetConfig VALUES
           Each is a reference to an array of hostnames (in order of preference), which should be
           used for the given protocol

           Your internet domain name

           If you have an FTP proxy firewall (NOT an HTTP or SOCKS firewall) then this value
           should be set to the firewall hostname. If your firewall does not listen to port 21,
           then this value should be set to "hostname:port" (eg "hostname:99")

           There are many different ftp firewall products available. But unfortunately there is
           no standard for how to traverse a firewall.  The list below shows the sequence of
           commands that Net::FTP will use

             user        Username for remote host
             pass        Password for remote host
             fwuser      Username for firewall
             fwpass      Password for firewall
             remote.host The hostname of the remote ftp server

           0   There is no firewall

                    USER user AT remote.host
                    PASS pass

                    USER fwuser
                    PASS fwpass
                    USER user AT remote.host
                    PASS pass

                    USER fwuser
                    PASS fwpass
                    SITE remote.site
                    USER user
                    PASS pass

                    USER fwuser
                    PASS fwpass
                    OPEN remote.site
                    USER user
                    PASS pass

                    USER user@fwuser AT remote.site
                    PASS pass@fwpass

                    USER fwuser AT remote.site
                    PASS fwpass
                    USER user
                    PASS pass

                    USER user AT remote.host
                    PASS pass
                    AUTH fwuser
                    RESP fwpass

           FTP servers can work in passive or active mode. Active mode is when you want to
           transfer data you have to tell the server the address and port to connect to.  Passive
           mode is when the server provide the address and port and you establish the connection.

           With some firewalls active mode does not work as the server cannot connect to your
           machine (because you are behind a firewall) and the firewall does not re-write the
           command. In this case you should set "ftp_ext_passive" to a true value.

           Some servers are configured to only work in passive mode. If you have one of these you
           can force "Net::FTP" to always transfer in passive mode; when not going via a
           firewall, by setting "ftp_int_passive" to a true value.

           A reference to a list of netmask strings in the form "".  These are used
           by the "requires_firewall" function to determine if a given host is inside or outside
           your firewall.

       The following entries are used during installation & testing on the libnet package

           If true then "make test" may attempt to connect to hosts given in the configuration.

           If true then "Configure" will check each hostname given that it exists

perl v5.20.2                                2018-06-10                         Net::Config(3perl)

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