[EXPLAINED] systemd wireless network service explanation

In times before systemd was mandatory i was using a simple script to connect to internet via wireless upon boot that set up wlan0, associated it with wireless and when that was done did dhcpcd to get ip. When systemd kicked in i did a bit of a kludge to emulate rc.local. Today i decided to clean that mess up and to make a native systemd service. I found the folowing network.service on arch wiki.
[Unit]
Description=Network Connectivity
Wants=network.target
Before=network.target
BindsTo=sys-subsystem-net-devices-wlan0.device
After=sys-subsystem-net-devices-wlan0.device
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/sbin/ip link set dev wlan0 up
ExecStart=/usr/sbin/wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf
ExecStart=/sbin/dhcpcd wlan0
[Install]
WantedBy=multi-user.target
This works perfectly. Now if someone is so nice to explain to me what happens here. Mainly where does it say that wpa_supplicant must be associated before dhcpcd starts? What exactly is network.target and what happens with this service when i suspend the computer?
Best regards.
Last edited by rokowsky (2013-03-29 12:12:09)

Ok i'm sorry, now i see that network.target is under Before not After, which only means that this service delays netvork.target so that other units know when the network is up. This file actually defines what network.target means if i'm seeing this right. I have only one question, wpa_supplicant is started in background so that dhcpcd should start right after wpa_supplicant, perhaps before we are associated with a wireless network. In a script one would put something like "sleep 5" between them or pipe wpa_supplicant output to a file and check that file if we are associated and than start dhcpcd. Why does this service work?

Similar Messages

Question about how wireless networks work

Hello,
This is more of a general question rather than one that is specific to the airport. I have a network with an Airport Express with wireless n, a Macbook Pro with a wireless n card, and a printer that has a wireless g card. Someone told me that because I have a wireless g device on my network that I will never get wireless n speeds even when using my computer to do things besides printing because the network is only as fast as its slowest device. Based on this, if there is a computer on my network that has a wireless g card then everyone on the network can only get wireless g speeds even if the others have wireless n cards.
It was always my understanding that I could not get n speeds when using the printer but I thought that if I were using my computer to connect to the internet, download, upload, etc. (things that have nothing to do with printing and don't require the printer) then I should be able to get wireless n speeds.
I was wondering if someone could explain how wireless networks work. Thanks in advance.

The simple answer is that having 802.11g (i.e. 54 Mbit/s) clients on an 802.11n network will NOT slow down the 802.11n clients.
However, 802.11g works only in the 2.4 GHz band, whereas 802.11n also works in the 5 GHz band, which is potentially much faster. So if you require compatibility with g devices on an AirPort Express, it decreases the potential maximum speed of the n devices, because you have to operate in the 2.4 GHz band. But this slowdown occurs whether or not g devices are actually connected to the network.

Wireless network?

Okay, I had this problem with my first iMac and now I'm having it again with my mini G4. I am on a windows PC which connects to our wireless network (service provided by SBC Yahoo! DSL) with out any problems. The macs, however, hate connecting! My iMac wouldn't connect, I was up from 12 AM to 4 AM trying to get on the network and then a few hours (of sleep) later, turned it on again, and went to a gig that I had to perform at and then when I came back, Safari said that it was working! I tried the network set up utility, the network diagnostics, and still, nothing. Every time I open Safari it goes "You are not connected to the internet Safari can't open livepage.apple.com...etc etc" I've restarted the computer, restarted the DSL modem, restarted the wireless router, turned off the modem then turned off the router and then finally turning on the modem and turning on the router and still, nothing! I'm using a NetGear wireless router and I can't connect to it. I am pretty sure it's not the airport on the mini because I can connect to the wireless router, I just can't actually acccess the internet. Help would be great, ASAP, any advice you can give or how you connected to the internet via your wireless network. Thanks!

Go into your router and check your settings - you want to look for a setting like 'maximum number of DHCP users' or where a range or number of wireless addresses are defined. This may be on a configuration screen where you set up the router connection to the internet. If DHCP users is set to, for example, 1, it would allow 1 user to fully access the internet. Anyone else would see a wireless signal, ie, on your mac menu bar you'd see bars on the airport wireless icon, but receive the message from the browser about not being able to connect to the internet, which is maddening. Find the setting and increase it to say 5, and see if that fixes it.
Then go back and re-enable everything you tried turning off in debugging, ie:
Disable SSID transmission (for wireless signal security)
Use WPA-PSK security (for wireless signal security)
Use mac address filtering (for internet usage security)

Autostart of network-service fails, but manual start works fine

I followed a guide to set up a network connection. The steps were to create a network config (/etc/config.d/network)
interface=eth0
address=192.168.1.2
netmask=24
broadcast=192.168.1.255
gateway=192.168.1.1
then a service description (/etc/systemd/system/network.service)
[Unit]
Description=Network startup
Wants=network.target
Before=network.target
[Service]
Type=oneshot
RemainAfterExit=yes
EnvironmentFile=/etc/conf.d/network
ExecStart=/sbin/ip link set dev ${interface} up
ExecStart=/sbin/ip addr add ${address}/${netmask} broadcast ${broadcast} dev ${interface}
ExecStart=/sbin/ip route add default via ${gateway}
ExecStop=/sbin/ip addr flush dev ${interface}
ExecStop=/sbin/ip link set dev ${interface} down
[Install]
WantedBy=multi-user.target
and then enable the service using systemctl enable network.
After the rebooting calling systemctl states the service as failed. If I start it manually using systemctl start network everything works fine.
How do I get it to work with autostart? Thanks in advance.
Last edited by devrandom (2013-08-03 12:22:55)

With 'a guide' I presume you referred to this guide
The guide states
To set static IP on enp3s0 interface you will need to create /etc/conf.d/network@enp3s0 config file and run:
# systemctl enable [email protected]
where enp3s0 has to be changed into your own interface name.
Note that the EnvironmentFile has to change to /etc/conf.d/network@<interface>.

Sometimes Network service is started before udev renaming interface

Hello,
I've configured my Nuc D34010WYKH2 with a bridge static ip address (used for virtualization with qemu-kvm). Sometimes, when i reboot the network service fails to start because the network interface is not yet renamed.
Here is the systemd log :
http://www.filedropper.com/journalctl2
My network script /etc/systemd/system/network.service :
http://pastebin.archlinux.fr/501234
/etc/conf.d/network :
http://pastebin.archlinux.fr/501235
I have another problem like no hdmi sound and it seems i have acpi problems (system log)
Last edited by Songohan (2014-04-23 19:15:02)

Apr 22 23:13:52 nuc systemd[1]: Starting udev Coldplug all Devices...
Apr 22 23:13:52 nuc systemd[1]: Started udev Coldplug all Devices.
Apr 22 23:13:54 nuc brctl[252]: interface eno1 does not exist!
Apr 22 23:13:54 nuc systemd-udevd[151]: renamed network interface eth0 to eno1
That's odd. You would expect udev to settle before the rest continue's.
I have it, look at comment #6 here. You need to instantiate (systemD jargon for multiplex) an ifplugd service file from netctl.
A different alternative is to add the following to your section:
BindsTo=sys-subsystem-net-devices-%i.device
After=sys-subsystem-net-devices-%i.device
I took these from the ifplugd service files. These are responsible for waiting after the device appears after it's rename. You need to replace %i with eno1, I think.
Apr 22 23:13:54 nuc kernel: snd_hda_intel 0000:00:1b.0: enabling device (0000 -> 0002)
Apr 22 23:13:54 nuc kernel: snd_hda_intel 0000:00:1b.0: irq 63 for MSI/MSI-X
Apr 22 23:13:54 nuc kernel: input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/input/input7
Apr 22 23:13:54 nuc kernel: input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input9
Apr 22 23:13:54 nuc kernel: input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input8
Could you post the output of:
cat /proc/asound/*
Last edited by Rexilion (2014-04-24 05:30:39)

Verizon Wireless Network Extender and the Terrible, Horrible, No Good, Very Bad Customer Service experience

It was a dark and stormy night...
For the past eight years, I had been happy with Verizon wireless service. Great coverage and rarely a dropped call. However, all of that changed when I moved into a lovely mid-century modern condominium. The solid concrete walls and ceilings were blocking my attempts to communicate with the outside world (i.e. order pizza).
Enter the Verizon Wireless Network Extender! My own personal cell tower! Alas, the VWNE was $250, which was a lot of money. So, being the resourceful recycling advocate that I am, I procured a refurbished one and hooked it up to my network. Then I called Verizon to begin what would soon become one of the Bottom 10 Least Enjoyable Experiences in customer service history (note: obvious foreshadowing).
The first technician I spoke with was Benjamin, who was actually quite helpful. He noted the VWNE's MAC address and other information before attempting to allow me to access my unit. But he could not. Why? Apparently the unit was still registered to another Verizon customer. He told me the matter would be forwarded to "Verizon Correspondence Support" who would contact the registered owner and get their approval to reassign the unit.
A week later, I called in to ask about the status of my request, but was told by Darryl (another tech from the VWNE department) that the "Verizon Correspondence Support" department did not exist. Did. Not. Exist? Fine, I explained the situation again, and Darryl eventually told me he would submit a special access form which may resolve the problem. He apologized for the mixup, thanked me for my patience, and told me to wait 24-48 hours for his return call with the results.
120 hours later, I called to ask about the status of the change access form because I had not received a callback. Michelle, another representative of VWNE support, told me there was no record of this form having been submitted. No. Record...? After which, she made no effort to help me after reading through my transcript. In fact, quite the opposite. To paraphrase...
"I'm sorry we wasted two weeks of your time leading you to believe we had a solution. Actually, there is no Verizon Correspondence Department, there is no special access form, and no tech will be calling you back. Furthermore, I will not allow you to use our unit because the previous owner hasn't filled out Release Form 27B stroke 6. For all I know it might have been stolen. Perhaps by you? I guess we'll never know for sure, because I won't contact the owner for any reason. In fact, there is nothing I can do to help you whatsoever. But if you like, feel free to throw our network adapter in a landfill. Thank you and have a nice day."
OK Michelle, here's the deal. I don't even WANT this doohickey. You see, all I want is for my phone to work. That's why I am calling you. To get THIS piece of your equipment working, at my expense, so that I can continue to be a Verizon customer. Seems like I'm doing my part. Why is this so difficult?
"Sorry"
Lesson of the story? DON'T BE A MICHELLE. If a customer is in trouble and you can't solve his/her problem, contact a supervisor and work out an alternative. In my example, perhaps Verizon could have provided me with an "official" VWNE? At a discount? Or have a technician sent out to examine the signal? Really, *anything* is better than being brushed off. After being brushed off.
After being brushed off.

Follow up: I acquired another VWNE from a local seller, just in case he had to be contacted for the Nuclear Priority Phone Release Code (geez). Ironically, it wasn't necessary, because said fellow had already left Verizon after too many negative customer service issues. Oops.
The good news is that Verizon was able to properly activate the second unit. I was connected to a VWNE tech named Bertha who was VERY helpful and treated me like a human being. Which made all the difference and restored my faith in humanity. I requested that my story be relayed to upper management so that the hordes of secondhand VWNE buyers wouldn't also get burned by Verizon's "hands off and look elsewhere" policy. Bingo. Finally. Done.
Epilogue: Until Verizon eases up on their needlessly stringent policy, beware the unchecked VWNE! Be sure to get the MAC code and check it with a local store/tech support before buying it.

I have bought a TC to extend the range of the wireless network in the house and would like someone to explain the best way to do this? My combine router/modem is supplied by Movistar(in Spain) model Xavi 7958 router ADSL with four ethernet ports.

What is the best way to extend my wireless network in the house using a TC? I currently use a combined router/modem supplied by Movistar(live in Spain) model XAVI 7958 router ADSL with four ethernet ports. What is the best configuration and can you explain what is meant by bridging and which is best to bridge for signal strenght TC or Xavi modem/router? Have ipads, iphones, apple tv...etc and want a connection them all in the whole house which, not just downstairs, to our wireless network.

You cannot wireless bridge Apple to non-apple router.. so that is out.
The only way you can do this is run ethernet or EOP adapters.. and place the TC in a location where the other apple idevices can reach it.
If you want to repeat wireless with apple routers you have to use another apple router next to the modem.. plugged in an running as an AP.
Basically the TC is the wrong piece of equipment unless you want Time Machine backups.. take it back and buy a universal repeater.. not apple. Or buy more apple stuff like an extreme or express.. one apple router is useless to you without running ethernet.

I have an ipad3 which has been spontaneously restarting and is not connecting well to either mobile service or wireless networks.

I have an ipad3 which has been spontaneously restarting and is not connecting well to either mobile service or wireless networks. It has become unusable. Is there a software update to fix this issue?
I have tried removing and reinserting the sim card - I am not even being asked to put in the sim pin to unlock the sim
I have reset the network settings and reconnected to my wireless network. I can get onto the wireless network but the ipad does not connect to my carrier even though my mobile phone (same carrier) has great service.
It seems to me that due to the connecton issue the ipad then restarts itself so I cant even use it for the local apps that do not require any connection to run because every few minutes the unit reboots.
heading to an istore tomorrow to have it looked at but wondered if there is a software upate or setting I can change myself to fix this isse.
not happy after the cost of the unit and ony had a few days use before the issues started!

Thanks Alan,
in the end it was replaced at the Apple iStore, they restored factory settings and it was still playing up for them too. Weird but the replacement is working perfectly!!

My HP 6500A Plus is connected to wireless network and web services but won't print email or code

I have my HP 6500A Plus connected to my wireless network and it is registered on the HP Web Services but it will not print the printer email address or code. I have followed the directions. I would appreciate your help in this matter. Dave

Hey ddwilson9999,
If your printer is telling you that it cannot connect to the server, try these steps.
1. Find your printer's IP address by printing a network configuration page.
2. Type you IP address into the address bar of your web browser.
3. Click on the network tab at the top of the page.
4. Look at the left hand side and click IPv4 under wireless.
5. Change the IP settings to Manual.
6. Enter the printer's IP address, your subnet mask, and your routers IP address or default gateway in the spaces.
7. Set the Preferred DNS to 8.8.8.8.
8. Set the Alternate DNS to 8.8.4.4.
9. Click apply.(You may need to refresh the page if it says processing for longer than a min and click apply again.)
10. Now try to print the information page.
Although I am an HP employee, I am speaking for myself and not for HP.
If I have resolved your issue, feel free to provide Kudos and make sure you mark this thread as solution provided.

Netctl fails to connect to a wireless network and does not give detail

If I try to connect to a wireless network (WEP, DHCP) using netctl I get "Jon for netctl@wlp2s0\x2dnetworkname.service failed." and two commands (journalctl -xn and systemctl status ...) that should give details about the error.
However, both of them give the following lines:
oct 05 14:44:25 laptop network[422]: Starting network profile 'wlp2s0-networkname'...
oct 05 14:44:30 laptop network[422]: Failed to bring the network up for profile 'wlp2s0-networkname'
oct 05 14:44:30 laptop systemd[1]: netctl@wlp2s0\x2dnetworkname.service: main process exited, code=exited, status=1/FAILURE
oct 05 14:44:30 laptop systemd[1]: Failed to start Networking for netctl profile wlp2s0-networkname.
oct 05 14:44:30 laptop systemd[1]: Unit netctl@wlp2s0\x2dnetworkname.service entered failed state.
Just one line saying that it was trying to connect and four lines repeating the same thing (connecting failed), but it does not give any detail at all.
The netctl profile is:
Interface=wlp2s0
Connection=wireless
Security=wep
ESSID=networkname
IP=dhcp
Key=\"hex-password
Last edited by eduardosm (2014-10-05 14:01:02)

MoonSwan wrote:Either this Key=\"hex-password was a typo when you cut & pasted that code or your issue is that you need a closing " symbol. So your line should read: Key=\"hex-password".
If you look at the netctl.profile man page, it explains some special quoting rules at the end. The literal double-quote (or escaped double-quote) actually just results in a non-quoted string when passed from netctl to the underlying supporting software. This is apparently necessary if the WEP key is in hexadecimal.

Cannot connect to wireless network

Hello,
I am trying to connect to my wifi network which is secured using WPA2. I have tried wpa_supplicant and netctl.
Relevant part of ip link
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT qlen 1000
link/ether 00:0f:b5:07:47:e9 brd ff:ff:ff:ff:ff:ff
Relevant output of iwlist wlan0 scanning:
Cell 02 - Address: C0:C1:C0:23:87:D6
ESSID:"GotThatGlitter"
Protocol:IEEE 802.11b
Mode:Master
Frequency:2.452 GHz (Channel 9)
Quality:56/100 Signal level:-60 dBm Noise level:-96 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Extra:bcn_int=100
Extra:atim=0
IE: Unknown: 000E476F7454686174476C6974746572
IE: Unknown: 010C82848B960C1218243048606C
IE: Unknown: 02050000000001
IE: Unknown: 030109
Attempt at connecting via wpa_supplicant:
wpa_supplicant -Dnl80211,wext -d -i wlan0 -c /etc/wpa_supplicant/GotThatGlitter.conf
wpa_supplicant v2.0
Successfully initialized wpa_supplicant
Initializing interface 'wlan0' conf '/etc/wpa_supplicant/GotThatGlitter.conf' driver 'nl80211,wext' ctrl_interface 'N/A' bridge 'N/A'
Configuration file '/etc/wpa_supplicant/GotThatGlitter.conf' -> '/etc/wpa_supplicant/GotThatGlitter.conf'
Reading configuration file '/etc/wpa_supplicant/GotThatGlitter.conf'
Priority group 0
id=0 ssid='GotThatGlitter'
nl80211: 'nl80211' generic netlink not found
Failed to initialize driver 'nl80211'
rfkill: Cannot open RFKILL control device
WEXT: RFKILL status not available
ioctl[SIOCSIWPMKSA]: Invalid argument
SIOCGIWRANGE: WE(compiled)=22 WE(source)=19 enc_capa=0x5
capabilities: key_mgmt 0x5 enc 0x17 flags 0x0
netlink: Operstate: linkmode=1, operstate=5
wlan0: Own MAC address: 00:0f:b5:07:47:e9
wpa_driver_wext_set_key: alg=0 key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_countermeasures
wlan0: RSN: flushing PMKID list in the driver
ioctl[SIOCSIWPMKSA]: Invalid argument
wlan0: Setting scan request: 0 sec 100000 usec
WPS: Set UUID for interface wlan0
WPS: UUID based on MAC address - hexdump(len=16): 72 d9 be 0e c4 a0 5e e1 8d 4e 25 92 94 78 e2 d8
EAPOL: SUPP_PAE entering state DISCONNECTED
EAPOL: Supplicant port status: Unauthorized
EAPOL: KEY_RX entering state NO_KEY_RECEIVE
EAPOL: SUPP_BE entering state INITIALIZE
EAP: EAP entering state DISABLED
EAPOL: Supplicant port status: Unauthorized
EAPOL: Supplicant port status: Unauthorized
wlan0: Added interface wlan0
wlan0: State: DISCONNECTED -> DISCONNECTED
wpa_driver_wext_set_operstate: operstate 0->0 (DORMANT)
netlink: Operstate: linkmode=-1, operstate=5
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
WEXT: if_removed already cleared - ignore event
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
WEXT: if_removed already cleared - ignore event
Wireless event: cmd=0x8b06 len=8
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
WEXT: if_removed already cleared - ignore event
Wireless event: cmd=0x8b1a len=40
wlan0: State: DISCONNECTED -> SCANNING
wlan0: Starting AP scan for wildcard SSID
Scan requested (ret=0) - scan timeout 10 seconds
EAPOL: disable timer tick
EAPOL: Supplicant port status: Unauthorized
Scan timeout - try to get results
wlan0: Event SCAN_RESULTS (3) received
Received 568 bytes of scan results (2 BSSes)
wlan0: BSS: Start scan result update 1
wlan0: BSS: Add new id 0 BSSID 68:7f:74:87:cc:6a SSID '400 Network'
wlan0: BSS: Add new id 1 BSSID c0:c1:c0:23:87:d6 SSID 'GotThatGlitter'
BSS: last_scan_res_used=2/32 last_scan_full=0
wlan0: New scan results available
wlan0: Selecting BSS from priority group 0
wlan0: 0: 68:7f:74:87:cc:6a ssid='400 Network' wpa_ie_len=22 rsn_ie_len=0 caps=0x11 level=-76
wlan0: skip - SSID mismatch
wlan0: 1: c0:c1:c0:23:87:d6 ssid='GotThatGlitter' wpa_ie_len=0 rsn_ie_len=0 caps=0x11 level=-58
wlan0: skip - no WPA/RSN proto match
wlan0: No suitable network found
wlan0: Setting scan request: 5 sec 0 usec
wlan0: Starting AP scan for wildcard SSID
Scan requested (ret=0) - scan timeout 10 seconds
^Cwlan0: Removing interface wlan0
wlan0: Request to deauthenticate - bssid=00:00:00:00:00:00 pending_bssid=00:00:00:00:00:00 reason=3 state=SCANNING
wlan0: No keys have been configured - skip key clearing
wlan0: State: SCANNING -> DISCONNECTED
wpa_driver_wext_set_operstate: operstate 0->0 (DORMANT)
netlink: Operstate: linkmode=-1, operstate=5
EAPOL: External notification - portEnabled=0
EAPOL: Supplicant port status: Unauthorized
EAPOL: External notification - portValid=0
EAPOL: Supplicant port status: Unauthorized
wpa_driver_wext_set_countermeasures
wlan0: No keys have been configured - skip key clearing
wlan0: BSS: Remove id 0 BSSID 68:7f:74:87:cc:6a SSID '400 Network' due to wpa_bss_flush
wlan0: BSS: Remove id 1 BSSID c0:c1:c0:23:87:d6 SSID 'GotThatGlitter' due to wpa_bss_flush
wlan0: Cancelling scan request
wlan0: Cancelling authentication timeout
netlink: Operstate: linkmode=0, operstate=6
wlan0: CTRL-EVENT-TERMINATING
cat /etc/wpa_supplicant/GotThatGlitter.conf
network={
ssid="GotThatGlitter"
#psk="why ... "
psk=f0014a19f67dc ... 947a6dae9
Attempt at connecting via netctl:
netctl start wireless-wpa
Job for netctl@wireless\x2dwpa.service failed. See 'systemctl status netctl@wireless\x2dwpa.service' and 'journalctl -xn' for details.
cat /etc/netctl/wireless-wpa
Description='Home'
Interface=wlan0
Connection=wireless
Security=wpa
IP=dhcp
ESSID='GotThatGlitter'
# Prepend hexadecimal keys with \"
#Key="why ..."
Key=\"f0014a19f67dc ... 2a947a6dae9
systemctl status netctl@wireless\x2dwpa.service
[email protected] - Networking for netctl profile wirelessx2dwpa
Loaded: loaded (/usr/lib/systemd/system/[email protected]; static)
Active: inactive (dead)
Docs: man:netctl.profile(5)
Jun 18 20:37:57 valinor systemd[1]: Stopped Networking for netctl profile wirelessx2dwpa.
Jun 18 20:39:46 valinor systemd[1]: Starting Networking for netctl profile wirelessx2dwpa...
Jun 18 20:39:46 valinor systemd[1]: [email protected]: main process exited, code=ex...LURE
Jun 18 20:39:46 valinor systemd[1]: Failed to start Networking for netctl profile wirelessx2dwpa.
Jun 18 20:39:46 valinor systemd[1]: Unit [email protected] entered failed state.
journalctl -xn
-- Logs begin at Tue 2013-06-18 13:32:21 MDT, end at Tue 2013-06-18 21:52:53 MDT. --
Jun 18 21:52:37 valinor systemd[1]: Starting A simple WPA encrypted wireless connection...
-- Subject: Unit netctl@wireless\x2dwpa.service has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Unit netctl@wireless\x2dwpa.service has begun starting up.
Jun 18 21:52:37 valinor network[528]: Starting network profile 'wireless-wpa'...
Jun 18 21:52:37 valinor network[528]: ioctl[SIOCSIWPMKSA]: Invalid argument
Jun 18 21:52:37 valinor kernel: IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
Jun 18 21:52:37 valinor network[528]: ioctl[SIOCSIWPMKSA]: Invalid argument
Jun 18 21:52:53 valinor network[528]: WPA association/authentication failed for interface 'wlan0'
Jun 18 21:52:53 valinor network[528]: Failed to bring the network up for profile 'wireless-wpa'
Jun 18 21:52:53 valinor systemd[1]: netctl@wireless\x2dwpa.service: main process exited, code=exited,
Jun 18 21:52:53 valinor systemd[1]: Failed to start A simple WPA encrypted wireless connection.
-- Subject: Unit netctl@wireless\x2dwpa.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Documentation: http://www.freedesktop.org/wiki/Software/systemd/catalog/be02cf6855d2428ba40df7e9d02
-- Unit netctl@wireless\x2dwpa.service has failed.
-- The result is failed.
Jun 18 21:52:53 valinor systemd[1]: Unit netctl@wireless\x2dwpa.service entered failed state.
The fact that I can find the see the network with iwlist wlan0 scanning leads me to believe that the driver is working fine, but I could be wrong. I am using ndiswrapper with a Windows driver.
I appreciate any suggestions! Thanks.
Last edited by lwalen (2013-06-19 04:04:54)

If you are using the 'Key=\"hexkeyhere' netctl parameter, it would seem taht you apparently think you should be using wep. If it is wep, you could just connect with iwconfig directly. But from scanning through all that ouput and stuff, I am really not sure if you are using wpa or wep. I think using "iw dev wlan0 scan" will provide more in depth info than iwlist.

Network.service won't boot

Hi there,
I just installed arch on my Thinkpad t42p which has a ipw2100 wireless chip. I configured the whole network manually and a corresponding systemd entry. Sometimes the network comes up at boot at sometimes it doesn't. When it doesn't boot I still can start it manually with
# systemctl start network
Why could it be that it sometimes boots and sometimes it doesn't?
Last edited by dead_kenny (2012-11-10 08:35:03)

Thx for the link skunktrader. Now I fixed the matter by asining a udev rule to the network interfaces as described in the wiki.
Now I installed arch on an ASUS notebook where the interfaces don't shift during boot but there the network.service also won't boot. I have to start the service manually after boot. The output of
systemctl /usr/lib/systemd/systemd
doesn't present the Network Connectivity until I start it manually. Could there be another reason for this? E.g. driver starts to late? How should I look for why systemd cannot start boot the network.service?

Wireless packet flow explanation

Hi My requirement is very simple , I will appreciate if someone can explain me the following concept as per the diagram mentioned below
I have 2 APs AP1 and AP2, both connect to switch on port f0/1 and f0/2 , the switch f0/3 inturn connects to a router on f0/0 , router's interface f0/1 connects to another switch which is wired network with ip add 192.168.2.0/24 .
1. APs broadcast 3 ssid (management , guest , cisco) respectively , how would the data flow happen for user connected to SSID cisco when pings another user connected to SSID guest , and how would data flow happen when user in SSID cisco ping a user 192.168.1.100 some user is wired network.
you can assume both the APs are autonomous and there is no controller.
I am looking for explanation in terms of frame tagging and packet encapsulation and depacsulation at various stages.
you can assume the IP nd vlan number on wireless network as you like.
2.if you are not tired yet then one mroe question with same topology , but this time the APs are lightweight and the controller is in a different subnet 192.168.1.0 , assume that the AP is already registered with controller , now how would the same above communication happen ,
I am looking for explanation in terms of frame tagging and packet encapsulation and depacsulation at various stages.
you can assume the IP and vlan number on wireless network as you like.
If you can refer me some doc its fine with me , I already went through many documents and nuggets , I do have a clear picture.
Thank you

1.
client to AP ===> 802.11 frame.
AP to client ===> 802.11 frame. At AP, received wired side ethernet frame removes the ethernet header with tag and encapsulates the IP packet using 802.11 header with right Bssid for that vlan.
AP ethernet to switch interface ===> Tag/UnTag Ethernet frame. At AP, received 802.11 frames removes the 802.11 mac header, the inner packet will be used to encapsulate using ethernet frame with Tag based on received Bssid.
ARP request - Broadcast packet sent by wireless client to AP as unicast. Once it decapsulates the 802.11 header, the inner IP packet hits the wire on that broadcast domain to reach upstream wired switch and wireless on same AP.
2.
AP to WLC ===> capwap/lwapp. 802.11 packets are encapsulated on L3 IP-UDP.
WLC to AP ===> capwap/lwapp.
All the client (802.11) packets are encapsulated in a LWAPP packet by the LAP and sent to the WLC. WLC descapsulates the LWAPP packet and acts based on the destination IP address in the 802.11 packet. If the destination is one of the wireless clients associated to the WLC, it encapsulates the packet again with the LWAPP and sends it to the LAP of the client, where it is decapsulated and sent to the wireless client. If the destination is on the wired side of the network, it removes the 802.11 header, adds the Ethernet header, and forwards the packet to the connected switch, from where it is sent to the wired client. When a packet comes from the wired side, WLC removes the Ethernet header, adds the 802.11 header, encapsulates it with LWAPP, and sends it to the LAP, where it is decapsulated, and the 802.11 packet is delivered to the wireless client
check:-
https://supportforums.cisco.com/message/3489064#3489064
https://supportforums.cisco.com/message/3717713#3717713

Internet connection slower even though TC is not part of wireless network!

How can this be? I connected TC to my iMac by ethernet cable to do the initial backup of my hard drive. The backup has been complete now for a number of days. What really mystifies me is the slower connection speed (I have cable) even when TC is NOT backing up, i.e., even between the hourly backups when TC isn't running.
I notice the slower speeds mostly via Safari. There is now a noticeable lag time between when I click on a URL and when the page loads. It's intermittent, but sometimes, it's so bad,mI havevto stop the loading of the page and try reloading the page. Usually, this pushes it through.
I never had this problem prior to connecting TC to my iMac.
I also have the most current firmware installed for TC, Airport Utility, etc.
Can anyone explain this phenomenon? I was planning to set up a dual network with TC and now I'm not so enthusiastic.
PS Have been reading through the threads here and came across one that reported a problem with TC and their 2.4 GHz phone? Could this be part of my problem? Even though TC isn't connected to my wireless network?
An additional question: isn't TC a 5 GHz device? Why would a 2.4 GHz device interfere with the 5 GHz TC?
Message was edited by: WildBill

The default radio mode for the TC is 802.11 n operating in the 2.4 GHz mode, but if one has a 5 GHz iMac, one would b able to choose the 5v GHz option?
You would choose the radio mode, using the AirPort Utility, to change to the appropriate 5 GHz radio band to meet your wireless network requirements. If your iMac is "n" enabled, it should be able to both discover the TC's 5 GHz network, but also connect to it.
Also, regarding a previous post on this thread, have you personally used the OpenDNS's DNS servers? Did it make a significant difference? How were the ads?
Yes, I am currently using this service with several of my computers, both Macs and PCs. In most cases I get better performance (as far as locating and accessing web pages) and better stability than when using my ISP's DNS servers. You may find a similar experience. As far as ads, the only "ads" I get is when I either type in an incorrect URL or the site does not exist. You would then get a default message page with a OpenDNS banner.

[SOLVED] Can't load wireless network (MEDIATEK Corp. Device 7630)

Hi all, I hope that someone helps me, because I need it.
I'm trying so hard to install the wireless controller I have on a new computer.
I have just installed Arch with the UEFI method, it seems to work quite fine, except for the wireless.
The Computer is ASUS F550C, in order not to lose time, I'm posting the output of what I have tried.
I tried to install the kernel module (driver) with ndiswrapper, and they seem to be loaded.
# lspci -k
03:00.0 Network controller: MEDIATEK Corp. Device 7630
Subsystem: Foxconn International, Inc. Device e074
Kernel modules: ndiswrapper
# iwconfig
enp4s0f2 no wireless extensions.
lo no wireless extensions.
I tried to load both network-manager, netctl via systemctl but it doesn't seem to work.
In the end of the day I noticed that the wifi led had been off all the time!
So I installed rfkill and executed:
#rfkill unblock all
that's the only thing I could do to let the led turn on!
If you can suggest me something (whatever it may be) please answer, or I will be linked for eternity.
Last edited by Dexxt (2014-03-05 15:49:06)

#ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp4s0f2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
link/ether bc:ee:7b:c8:8c:6d brd ff:ff:ff:ff:ff:ff
I am connected to Ethernet (via systemctl enable dhcp.service).
I tried to use systemctl enable netcfg.service but I get:
#systemctl status netcfg.service
netcfg.service - Netcfg multi-profile daemon
Loaded: loaded (/etc/systemd/system/netcfg.service; disabled)
Active: inactive (dead)
Last edited by Dexxt (2014-02-25 22:32:35)

[EXPLAINED] systemd wireless network service explanation

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