Tools/NetworkManager

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Revision as of 12:33, 24 July 2012 by Pavlix (Talk | contribs)

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NetworkManager

NetworkManager provides automatic network detection and configuration for the system. Once enabled, the NetworkManager service also monitors the network interfaces, and may automatically switch to the best connection at any given time. Applications that include NetworkManager support may automatically switch between on-line and off-line modes when the system gains or loses network connectivity.

These facilities are most useful for modern laptops, where the user may move between wireless networks, and plug in to a variety of wired networks, but NetworkManager also provides features that are relevant to workstations. Current versions of NetworkManager support modem connections, and certain types of VPN. Development of these features is ongoing.

NetworkManager requires Fedora to have drivers for the wired and wireless interfaces on the computer. Many manufacturers of modems and wireless devices provide limited support for Linux. You may need to install additional drivers or firmware on your Fedora system in order to activate these interfaces.


Idea.png
Drivers first
NetworkManager may only work with network interfaces once the relevant drivers are correctly installed on your system. Reboot your system after installing a new firmware or a new driver in order to ensure that the changes take effect.

NetworkManager objectives

NM is slowly changing from a desktop network connection configurator to a universal network configuration software that could be used as a part of the base system.

  • Provide core network configuration features
  • Expose the features through on-disk text-based configuration
  • Expose the features through D-Bus API and CLI (GUI frontends should be built upon the D-Bus API)

Features

Broken features

Possible future features

  • Ethernet Bridging
  • Keeping wired devices allways on (for IPv6 link-local networking)
  • Support for IPv6 automatic reconfiguration (changing default routes, etc...)
  • Event-based IPv6 handling without timers and duplicate processing (would clean logs and make code more robust)
  • Exporting list of DNS servers and handing it over to recursive DNS servers like unbound and dnsmasq (especially necessary for proper VPN access)
  • Local caching nameserver with DNSSEC and forwarders
  • Support for networking on manually created interfaces (e.g. bridges)
  • Support for easy temporary connection setup through CLI, D-Bus (and GUI)
  • Support for making (the above) temporary connections permanent

Note: Some of the features described here may have been already available and working at some point of time.

More resources:

Known problems

  • NetworkManager gets automaticaly respawned, no sane way to temporarily disable it
  • List of unmanaged devices (by MAC) is sometimes ignored (sorry, cannot reproduce right now but it was also confirmed by others)
  • Manually assigned IPv4 addresses get lost (in tens of seconds)
  • dhclient left over upon exist and spawned duplicately (also dhclient's check failes when permision denied when writing pidfile)
  • Serious IPv6 problems (some of fixed in git, targeting 0.9.6), affecting also IPv4 networking and link
  • IPv6 code is still full of workarounds
  • Malfunctioning connection 'assume' functionality for IPv4 (removed for IPv6)
  • Serious doubts about working integration with network-scripts
  • Doesn't work well with dnssec-trigger/unbound/dnsmasq (DNS is not conveyed)
  • Missing CLI tools that would be as simple as manual (iproute/wpa_supplicant/wvdial/...) configuration
  • Other things work only when in some specific state
  • NetworkManager features are not currently implemented with testability in mind
  • Too many open bug reports, many probably obsolete

Note: some of the problems are deep in the core of NetworkManager. It can be expected that more problems will emerge over time or while fixing the currently known ones.

Notes

  • NetworkManager builds against specific distributions, not tools or dependencies (--with-distro)

About this section of the wiki

Currently most of the information in this page and the Tools/NetworkManager subtree have been added by me (User:Pavlix). Please feel free to add, correct and clarify stuff but please get in touch with me before deleting.

Further Information