zh-CN:Netcfg Troubleshooting Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary wiki Template:Article summary end
- 1 Troubleshooting
- 1.1 Debugging
- 1.2 Network unavailable
- 1.3 Wireless association failed
- 1.4 Unable to get IP address with DHCP
- 1.5 Not a valid connection, check spelling or look at examples
- 1.6 No Connection
- 1.7 Driver quirks
- 1.8 Ralink legacy drivers rt2500, rt2400 that use iwpriv
- 1.9 "find: '/var/run/network/suspend/': No such file or directory"
- 1.10 wlan0 does not exist
- 1.11 Help
To run netcfg with debugging output, set the
NETCFG_DEBUG environment variable to
"yes", for example:
# NETCFG_DEBUG="yes" netcfg <arguments>
Debugging information for wpa_supplicant can be logged using
WPA_OPTS within a profile, for example:
Whatever is entered here will be added to the command when
wpa_supplicant is called.
This error is typically due to:
- Out of range; or
- Driver issue.
Wireless association failed
This error is typically due to:
- Out of range/reception;
- Incorrect configuration;
- Invalid key;
- Driver problem; or
- Trying to connect to a hidden network.
If the connection problem is due to poor reception, increase the
TIMEOUT variable in
/etc/network.d/mynetwork, such as:
If an AP with a hidden SSID is used, try:
PRE_UP='iwconfig $INTERFACE essid $ESSID'
Unable to get IP address with DHCP
This error is typically due to out of range/bad reception.
DHCP_TIMEOUT variable in your network
Not a valid connection, check spelling or look at examples
You must set
CONNECTION to one of the connection types listed in the
/usr/lib/network/connections directory. Alternatively, use one of the provided configuration examples in
If you get a set of debug messages similar to the following (remembering that profile names and interface names may be different), it could be that the process of bringing up the interface is taking too long.
DEBUG: Loading profile eth0-dhcp DEBUG: Configuring interface eth0 :: eth0-dhcp up DEBUG: status reported to profile_up as: DEBUG: Loading profile eth0-dhcp DEBUG: Configuring interface eth0 DEBUG: ethernet_iproute_up ifup > No connection DEBUG: profile_up connect failed [FAIL]
The default is 2 seconds. To lengthen the timeout, set the
CARRIER_TIMEOUT variable before calling netcfg.
This thread shows one example of this issue: https://bbs.archlinux.org/viewtopic.php?id=138615
Skip no carrier
When you can manually bring up an interface but the journal says „No connection“ during boot, it might be that the physical connection cannot be detected fast enough. Try adding this to your profile:
Netcfg will then assign the IP address regardless of whether there is a cable actually attached.
Some drivers behave oddly and need workarounds to connect. Quirks must be enabled manually. They are best determined by reading the forums, seeing what others have used, and, if that fails, trial and error. Quirks can be combined.
iwlist $INTERFACE scanbefore attempting to connect (Broadcom)
iwconfig $INTERFACE essid $ESSIDbefore attempting to connect (ipw3945, Broadcom and Intel PRO/Wireless 4965AGN)
- Same as previous, run before starting
wpa_supplicant. Not supported anymore - use
IWCONFIG="essid $ESSID"instead. (ath9k)
- Take interface down before association and then restore it after (madwifi)
- Sleep one second before checking if the association was successful
iwlist scanafter associating
Add the required quirks to the netcfg configuration file
/etc/network.d/mynetwork. For example:
If you receive "Wireless network not found", "Association failed" errors and have tried the above, or if an AP with a hidden SSID is used, see the above section #Wireless association failed.
There is no plans to add WPA support to these drivers. rt2x00 is supported, however, and will replace these.
If you must use them, create a shell script that runs the needed
iwpriv commands and put its path in
"find: '/var/run/network/suspend/': No such file or directory"
If you get this error message, then do not bother because it is a known bug. Create the directory by hand.
wlan0 does not exist
In order to make sure the network hardware is initialised before a network connection attempt is made, add the "After" and "BindTo" lines to the appropriate netcfg or netcfg@ file found in /etc/systemd/system/*/
where "sys-devices-xxx-net-wlan0.device" can be seen in
If this article did not help solve your problem, the next best places to ask for help are the forums, the mailing list, and the IRC Channel.
To be able to determine the problem, we need information. When you ask, provide the following output:
- ALL OUTPUT FROM netcfg
- This is absolutely crucial to be able determine what went wrong. The message might be short or non-existent, but it can mean a great deal.
- This is also crucial as many problems are simple configuration issues. Feel free to censor your wireless key.
- netcfg version