Difference between revisions of "Netcfg"

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{{Article summary end}}
 
{{Article summary end}}
  
Netcfg is used to configure and manage network connections via profiles. It has pluggable support for a range of connection types, such as wireless, Ethernet, [[Wikipedia:Point-to-point_protocol|PPP]]. It is also capable of starting/stopping many-to-one connections, that is, multiple connections within the same profile, optionally with bonding. Further it is useful for users seeking a simple and robust means of managing multiple network configurations (e.g. laptop users). With the push to drop support for {{Pkg|initscripts}}/SysV, netcfg is one of several choices users have to managing their network connectivity under [[systemd]].
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Netcfg is used to configure and manage network connections via profiles. It has pluggable support for a range of connection types, such as wireless, Ethernet and [[Wikipedia:Point-to-point_protocol|PPP]]. It is also capable of starting/stopping many-to-one connections, that is, multiple connections within the same profile, optionally with bonding. Further it is useful for users seeking a simple and robust means of managing multiple network configurations (e.g. laptop users). With the push to drop support for {{Pkg|initscripts}}/SysV, netcfg is one of several choices users have to managing their network connectivity under [[systemd]].
  
 
{{Note|1={{Pkg|netcfg}} >= 2.8.9 drops deprecated {{ic|/etc/[[rc.conf]]}} compatibility. Netcfg users should configure all interfaces in {{ic|/etc/conf.d/netcfg}} instead of {{ic|/etc/rc.conf}}.}}
 
{{Note|1={{Pkg|netcfg}} >= 2.8.9 drops deprecated {{ic|/etc/[[rc.conf]]}} compatibility. Netcfg users should configure all interfaces in {{ic|/etc/conf.d/netcfg}} instead of {{ic|/etc/rc.conf}}.}}
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=== Just one profile ===
 
=== Just one profile ===
  
This is the simplest case: you have just one profile, and you always want it to start on boot. Simply enable it:
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In the simplest case, only one profile will be used and is always desired to start on boot:
  
  # systemctl enable netcfg@myprofile.service
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  # systemctl enable netcfg@myprofile
  
 
=== Net-Profiles ===
 
=== Net-Profiles ===
  
Edit the {{ic|NETWORKS}} array in {{ic|/etc/conf.d/netcfg}} to refer to your network config file {{ic|/etc/network.d/mynetwork}}.
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Edit the {{ic|NETWORKS}} array in {{ic|/etc/conf.d/netcfg}} to refer to the network config file {{ic|/etc/network.d/mynetwork}}.
  
 
{{hc|/etc/conf.d/netcfg|2=
 
{{hc|/etc/conf.d/netcfg|2=
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Start the service on startup:
 
Start the service on startup:
  
  # systemctl enable netcfg.service
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  # systemctl enable netcfg
  
 
Alternatively, the profiles that were active at last shutdown can be restored by setting the {{ic|NETWORKS}} array to {{ic|last}}.
 
Alternatively, the profiles that were active at last shutdown can be restored by setting the {{ic|NETWORKS}} array to {{ic|last}}.
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NETWORKS=(last)}}
 
NETWORKS=(last)}}
  
Finally, {{ic|net-profiles}} can be configured to display a menu – allowing users to choose a desired profile – by setting the contents of the {{ic|NETWORKS}} array to {{ic|menu}}:
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{{Note|For {{ic|NETWORKS=(last)}} to work, you will have to connect to your network manually first and then stop the daemon for Netcfg to remember the network. You can stop the Netcfg daemon by running {{ic|netcfg-daemon stop}} as root.}}
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 +
Finally, {{ic|net-profiles}} can be configured to display a menu—allowing users to choose a desired profile—by setting the contents of the {{ic|NETWORKS}} array to {{ic|menu}}:
  
 
{{hc|/etc/conf.d/netcfg|2=
 
{{hc|/etc/conf.d/netcfg|2=
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Additionally, the {{Pkg|dialog}} package is required.
 
Additionally, the {{Pkg|dialog}} package is required.
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 +
{{Note|The {{ic|1=NETWORKS=(menu)}} setting cannot be used anymore when switching to systemd. See {{bug|31377}} for details.}}
  
 
{{Tip|Access the menu at any time by running {{ic|netcfg-menu}} in a terminal.}}
 
{{Tip|Access the menu at any time by running {{ic|netcfg-menu}} in a terminal.}}
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{{Note|If AUTO_PROFILES is not set, all wireless networks will be tried.}}
 
{{Note|If AUTO_PROFILES is not set, all wireless networks will be tried.}}
  
Enable the {{ic|net-auto-wireless.service}} so systemd manages it.
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Enable {{ic|net-auto-wireless.service}} so systemd manages it.
  
  # systemctl enable net-auto-wireless.service
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  # systemctl enable net-auto-wireless
  
 
=== Net-Auto-Wired ===
 
=== Net-Auto-Wired ===
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Specify the desired wired interface with the {{ic|WIRED_INTERFACE}} variable in {{ic|/etc/conf.d/netcfg}}.
 
Specify the desired wired interface with the {{ic|WIRED_INTERFACE}} variable in {{ic|/etc/conf.d/netcfg}}.
  
Enable the {{ic|net-auto-wired.service}} so systemd manages it.
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Enable {{ic|net-auto-wired.service}} so systemd manages it.
  
  # systemctl enable net-auto-wired.service
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  # systemctl enable net-auto-wired
  
 
The daemon starts an {{ic|ifplugd}} process which runs {{ic|/etc/ifplugd/netcfg.action}} when the status of the wired interface changes (e.g. a cable is plugged in or unplugged). On plugging in a cable, attempts are made to start any profiles with {{ic|1=CONNECTION = "ethernet"}} or {{ic|"ethernet-iproute"}} and {{ic|1=INTERFACE = WIRED_INTERFACE}} until one of them succeeds.
 
The daemon starts an {{ic|ifplugd}} process which runs {{ic|/etc/ifplugd/netcfg.action}} when the status of the wired interface changes (e.g. a cable is plugged in or unplugged). On plugging in a cable, attempts are made to start any profiles with {{ic|1=CONNECTION = "ethernet"}} or {{ic|"ethernet-iproute"}} and {{ic|1=INTERFACE = WIRED_INTERFACE}} until one of them succeeds.

Revision as of 21:50, 12 November 2012

Summary help replacing me
A guide to configuring the network using netcfg and network profile scripts.
Overview
Template:Networking overview
Resources
Netcfg Tips
Netcfg Troubleshooting
Netcfg network scripts repository

Netcfg is used to configure and manage network connections via profiles. It has pluggable support for a range of connection types, such as wireless, Ethernet and PPP. It is also capable of starting/stopping many-to-one connections, that is, multiple connections within the same profile, optionally with bonding. Further it is useful for users seeking a simple and robust means of managing multiple network configurations (e.g. laptop users). With the push to drop support for initscripts/SysV, netcfg is one of several choices users have to managing their network connectivity under systemd.

Note: netcfg >= 2.8.9 drops deprecated /etc/rc.conf compatibility. Netcfg users should configure all interfaces in /etc/conf.d/netcfg instead of /etc/rc.conf.

Preparation

In the simplest cases, users must at least know the name of their network interface(s) (e.g. eth0, wlan0). If configuring a static IP address, the IP addresses of the default gateway and name server(s) must also be known.

If connecting to a wireless network, have some basic information ready. For a wireless network this includes what type of security is used, the network name (ESSID), and any passphrase or encryption keys. Additionally, ensure the proper drivers and firmware are installed for the wireless device, as described in Wireless Setup.

Installation

The netcfg package is available in the official repositories. As of netcfg version 2.5.x, optional dependencies include wpa_actiond, which is required for automatic/roaming wireless connections, and ifplugd, which is required for automatic Ethernet configuration. See the announcement.

Users wanting Bash completion support for netcfg, install the bash-completion package from the official repositories.

Configuration

Network profiles are stored in /etc/network.d/. To minimize the potential for errors, copy an example configuration from /etc/network.d/examples/ to /etc/network.d/mynetwork. The file name is the name of the network profile, and mynetwork is used as an example throughout this article.

Depending on the connection type and security, use one of the following examples from /etc/network.d/examples/ as a base.

Warning: Be wary of examples found on the internet as they often contain deprecated options that may cause problems!
Connection Type Example Profile Information
Wired Dynamic IP ethernet-dhcp
Static IP ethernet-static
Routed ethernet-iproute Can be checked with route from the net-tools package.
Wireless WPA-Personal wireless-wpa Uses a passphrase/pre-shared key.
WPA-Enterprise wireless-wpa-config The wpa_supplicant configuration is external.
wireless-wpa-configsection The wpa_supplicant configuration is stored as a string.

Modify the new configuration file, /etc/network.d/mynetwork:

  • Set INTERFACE to the correct wireless or Ethernet interface. This can be checked with ip link and iwconfig.
  • Ensure the ESSID and KEY (passphrase) are set correctly for wireless connections. Typos in these fields are common errors.
    • Note that WEP string keys (not hex keys) must be specified with a leading s: (e.g. KEY="s:somepasskey").
Note: Netcfg configurations are valid Bash scripts. Any configuration involving special characters such as $ or \ needs to be quoted correctly otherwise it will be interpreted by Bash. To avoid interpretation, use single quotes or backslash escape characters where appropriate.
Note: Network information (e.g. wireless passkey) will be stored in plain text format, so users may want to change the permissions on the newly created profile (e.g. chmod 0600 /etc/network.d/mynetwork) to make it readable by root only.
Note: For WPA-Personal, it is also possible to encode the WPA passkey into a hexadecimal string. Save the new hexadecimal string into the wireless WPA profile in /etc/network.d/mynetwork as the value of the KEY variable (make sure this will be the only KEY variable enabled), to look similar to this: KEY='7b271c9a7c8a6ac07d12403a1f0792d7d92b5957ff8dfd56481ced43ec6a6515'. That should disable the need to reveal the passkey.

Manual Operation

To connect a profile:

# netcfg mynetwork

To disconnect a profile:

# netcfg down mynetwork

If successful, users can configure netcfg to connect automatically or during boot. If the connection fails, see Netcfg Troubleshooting for solutions and for how to ask for help.

Additionally, see:

$ netcfg help

Automatic Operation

Just one profile

In the simplest case, only one profile will be used and is always desired to start on boot:

# systemctl enable netcfg@myprofile

Net-Profiles

Edit the NETWORKS array in /etc/conf.d/netcfg to refer to the network config file /etc/network.d/mynetwork.

/etc/conf.d/netcfg
NETWORKS=(mynetwork yournetwork)

Start the service on startup:

# systemctl enable netcfg

Alternatively, the profiles that were active at last shutdown can be restored by setting the NETWORKS array to last.

/etc/conf.d/netcfg
NETWORKS=(last)
Note: For NETWORKS=(last) to work, you will have to connect to your network manually first and then stop the daemon for Netcfg to remember the network. You can stop the Netcfg daemon by running netcfg-daemon stop as root.

Finally, net-profiles can be configured to display a menu—allowing users to choose a desired profile—by setting the contents of the NETWORKS array to menu:

/etc/conf.d/netcfg
NETWORKS=(menu)

Additionally, the dialog package is required.

Note: The NETWORKS=(menu) setting cannot be used anymore when switching to systemd. See FS#31377 for details.
Tip: Access the menu at any time by running netcfg-menu in a terminal.

Net-Auto-Wireless

This allows users to automatically connect to wireless networks with proper roaming support. To use this feature, the wpa_actiond package is required. Note that wireless-wpa-config profiles do not work with net-auto-wireless. Convert them to wireless-wpa-configsection instead.

Specify the desired wireless interface with the WIRELESS_INTERFACE variable in /etc/conf.d/netcfg or define a list of wireless networks that should be automatically connected with the AUTO_PROFILES variable in /etc/conf.d/netcfg.

Note: If AUTO_PROFILES is not set, all wireless networks will be tried.

Enable net-auto-wireless.service so systemd manages it.

# systemctl enable net-auto-wireless

Net-Auto-Wired

This allows users to automatically connect to wired networks. To use this feature, the ifplugd package is required.

Specify the desired wired interface with the WIRED_INTERFACE variable in /etc/conf.d/netcfg.

Enable net-auto-wired.service so systemd manages it.

# systemctl enable net-auto-wired

The daemon starts an ifplugd process which runs /etc/ifplugd/netcfg.action when the status of the wired interface changes (e.g. a cable is plugged in or unplugged). On plugging in a cable, attempts are made to start any profiles with CONNECTION = "ethernet" or "ethernet-iproute" and INTERFACE = WIRED_INTERFACE until one of them succeeds.

Note: DHCP profiles are tried before static ones, which could lead to undesired results in some cases. However, one can tell netcfg to prefer a particular interface by adding AUTO_WIRED=1 to the desired profile.
Note: The net-auto-wired daemon cannot start multiple ifplugd processes for multiple interfaces (unlike ifplugd's own /etc/rc.d/ifplugd which can).

FAQ

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