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Author image David A P Mitchell
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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 a file in the perl installation tree, 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 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


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

There is no firewall

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

7 POD Errors

The following errors were encountered while parsing the POD:

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