# phpman > man > Net::Config ## NAME [Net::Config](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AConfig/markdown) - Local configuration data for libnet ## SYNOPSIS use [Net::Config](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AConfig/markdown) qw(%NetConfig); ## DESCRIPTION "[Net::Config](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AConfig/markdown)" 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" ], } __END__ ### Class Methods "[Net::Config](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AConfig/markdown)" defines the following methods. They are methods as they are invoked as class methods. This is because "[Net::Config](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AConfig/markdown)" inherits from "[Net::LocalCfg](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ALocalCfg/markdown)" 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 are. -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 nntp_hosts snpp_hosts pop3_hosts smtp_hosts ph_hosts daytime_hosts time_hosts Each is a reference to an array of hostnames (in order of preference), which should be used for the given protocol inet_domain Your internet domain name ftp_firewall 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") ftp_firewall_type 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](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AFTP/markdown) 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 1 USER PASS pass 2 USER fwuser PASS fwpass USER PASS pass 3 USER fwuser PASS fwpass SITE remote.site USER user PASS pass 4 USER fwuser PASS fwpass OPEN remote.site USER user PASS pass 5 USER user@ PASS pass@fwpass 6 USER PASS fwpass USER user PASS pass 7 USER PASS pass AUTH fwuser RESP fwpass ftp_ext_passive ftp_int_passive 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](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3AFTP/markdown)" to always transfer in passive mode; when not going via a firewall, by setting "ftp_int_passive" to a *true* value. local_netmask A reference to a list of netmask strings in the form "134.99.4.0/24". 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 test_hosts If true then "make test" may attempt to connect to hosts given in the configuration. test_exists If true then "Configure" will check each hostname given that it exists ## EXPORTS The following symbols are, or can be, exported by this module: Default Exports %NetConfig. Optional Exports *None*. Export Tags *None*. ## KNOWN BUGS *None*. ## AUTHOR Graham Barr < >>. Steve Hay < >> is now maintaining libnet as of version 1.22_02. ## COPYRIGHT Copyright (C) 2000 Graham Barr. All rights reserved. Copyright (C) 2013-2014, 2016, 2020 Steve Hay. All rights reserved. ## LICENCE This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself, i.e. under the terms of either the GNU General Public License or the Artistic License, as specified in the LICENCE file. ## VERSION Version 3.13 ## DATE 23 Dec 2020 ## HISTORY See the Changes file.