Netctl: Retry connection on DHCP failure

So I'm in the following situation:
Our university wireless network often has DHCP issues and it takes thousands of millions of retries until you finally get an address. The problem is, netctl-auto doesn't retry to connect to the network on a failure. It just stops doing anything.
Is there a way to get netctl to retry a profile until it's working when there are no other networks in range configured?
Wolle

Anyone looking at this should check this thread: https://bbs.archlinux.org/viewtopic.php?id=190141
Basically, it boils down to adding "-b" switch to dhcpcd.

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    May 17 00:41:41 <hostname> wpa_actiond[483]: Interface 'wlan0' lost connection to network '<network_2>'
    May 17 00:41:48 <hostname> wpa_actiond[483]: Interface 'wlan0' reestablished connection to network '<network_2>'
    May 17 00:41:48 <hostname> wpa_actiond[483]: Interface 'wlan0' lost connection to network '<network_2>'
    May 17 00:41:51 <hostname> wpa_actiond[483]: Interface 'wlan0' reestablished connection to network '<network_2>'
    May 17 00:41:51 <hostname> wpa_actiond[483]: Interface 'wlan0' lost connection to network '<network_2>'
    May 17 00:41:54 <hostname> wpa_actiond[483]: Interface 'wlan0' reestablished connection to network '<network_2>'
    May 17 00:41:54 <hostname> wpa_actiond[483]: Interface 'wlan0' lost connection to network '<network_2>'
    May 17 00:41:58 <hostname> wpa_actiond[483]: Interface 'wlan0' reestablished connection to network '<network_2>'
    May 17 00:41:58 <hostname> wpa_actiond[483]: Interface 'wlan0' lost connection to network '<network_2>'
    # journalctl -xn
    -- Logs begin at Sat 2012-12-08 23:44:06 CET, end at Fri 2013-05-17 00:47:43 CEST. --
    May 17 00:47:33 <hostname> kernel: cfg80211: Calling CRDA to update world regulatory domain
    May 17 00:47:36 <hostname> kernel: wlan0: authenticate with <network_2 mac address>
    May 17 00:47:36 <hostname> kernel: wlan0: send auth to <network_2 mac address> (try 1/3)
    May 17 00:47:36 <hostname> kernel: wlan0: authenticated
    May 17 00:47:36 <hostname> kernel: wlan0: associate with <network_2 mac address> (try 1/3)
    May 17 00:47:36 <hostname> kernel: wlan0: RX AssocResp from <network_2 mac address> (capab=0x431 status=0 aid=3)
    May 17 00:47:36 <hostname> kernel: wlan0: associated
    May 17 00:47:36 <hostname> wpa_actiond[483]: Interface 'wlan0' reestablished connection to network '<network_2>'
    More interestingly, dmesg seems to provide a reason for this behaviour:
    # dmesg
    [ 1438.732242] wlan0: authenticate with <network_2 mac address>
    [ 1438.737594] wlan0: send auth to <network_2 mac address> (try 1/3)
    [ 1438.740384] wlan0: authenticated
    [ 1438.743113] wlan0: associate with <network_2 mac address> (try 1/3)
    [ 1438.747226] wlan0: RX AssocResp from <network_2 mac address> (capab=0x431 status=0 aid=3)
    [ 1438.767629] wlan0: associated
    [ 1438.837011] wlan0: AP <network_2 mac address> changed bandwidth, new config is 2412 MHz, width 1 (2412/0 MHz)
    [ 1438.837024] wlan0: AP <network_2 mac address> changed bandwidth in a way we can't support - disconnect
    [ 1438.896427] cfg80211: Calling CRDA to update world regulatory domain
    [ 1442.140427] wlan0: authenticate with <network_2 mac address>
    [ 1442.145282] wlan0: send auth to <network_2 mac address> (try 1/3)
    [ 1442.148090] wlan0: authenticated
    [ 1442.151674] wlan0: associate with <network_2 mac address> (try 1/3)
    [ 1442.155712] wlan0: RX AssocResp from <network_2 mac address> (capab=0x431 status=0 aid=3)
    [ 1442.175911] wlan0: associated
    [ 1442.214954] wlan0: AP <network_2 mac address> changed bandwidth, new config is 2412 MHz, width 1 (2412/0 MHz)
    [ 1442.214967] wlan0: AP <network_2 mac address> changed bandwidth in a way we can't support - disconnect
    [ 1442.258359] cfg80211: Calling CRDA to update world regulatory domain
    I'm pretty sure everything should theoretically work fine, because it worked before the netctl update. I was even connected to this network today until i had to reboot!
    Now here's what happens if I try to connect manually:
    # netctl start <network_2>
    Job for netctl@<network_2>.service failed. See 'systemctl status netctl@<network_2>.service' and 'journalctl -xn' for details.
    # systemctl status netctl@<network_2>.service
    netctl@<network_2>.service - Networking for netctl profile <network_2>
    Loaded: loaded (/usr/lib/systemd/system/[email protected]; static)
    Active: failed (Result: exit-code) since Fri 2013-05-17 00:58:40 CEST; 2min 36s ago
    Docs: man:netctl.profile(5)
    Process: 7368 ExecStart=/usr/lib/network/network start %I (code=exited, status=1/FAILURE)
    May 17 00:58:40 <hostname> network[7368]: Starting network profile '<network_2>'...
    May 17 00:58:40 <hostname> network[7368]: The interface of network profile '<network_2>' is already up
    May 17 00:58:40 <hostname> systemd[1]: netctl@<network_2>.service: main process exited, code=exited, status=1/FAILURE
    May 17 00:58:40 <hostname> systemd[1]: Failed to start Networking for netctl profile <network_2>.
    May 17 00:58:40 <hostname> systemd[1]: Unit netctl@<network_2>.service entered failed state.
    After an # ip link set wlan0 down netctl still claims that its job failed:
    # netctl start <network_2>
    Job for netctl@<network_2>.service failed. See 'systemctl status netctl@<network_2>.service' and 'journalctl -xn' for details.
    This time, the DHCP lease attempt seems to be failing:
    # systemctl status netctl@<network_2>.service
    netctl@<network_2>.service - Networking for netctl profile <network_2>
    Loaded: loaded (/usr/lib/systemd/system/[email protected]; static)
    Active: failed (Result: exit-code) since Fri 2013-05-17 01:04:42 CEST; 1min 33s ago
    Docs: man:netctl.profile(5)
    Process: 8423 ExecStart=/usr/lib/network/network start %I (code=exited, status=1/FAILURE)
    May 17 01:04:23 <hostname> systemd[1]: Starting Networking for netctl profile <network_2>...
    May 17 01:04:23 <hostname> network[8423]: Starting network profile '<network_2>'...
    May 17 01:04:31 <hostname> dhcpcd[8656]: version 5.6.8 starting
    May 17 01:04:31 <hostname> dhcpcd[8656]: wlan0: carrier lost
    May 17 01:04:31 <hostname> dhcpcd[8656]: wlan0: waiting for carrier
    May 17 01:04:41 <hostname> dhcpcd[8656]: timed out
    May 17 01:04:41 <hostname> network[8423]: DHCP IP lease attempt failed on interface 'wlan0'
    May 17 01:04:42 <hostname> systemd[1]: netctl@<network_2>.service: main process exited, code=exited, status=1/FAILURE
    May 17 01:04:42 <hostname> systemd[1]: Failed to start Networking for netctl profile <network_2>.
    May 17 01:04:42 <hostname> systemd[1]: Unit netctl@<network_2>.service entered failed state.
    I wasn't able to find out whether netctl needs a running dhcpcd or not, but after running a systemctl start dhcpcd.service, dmesg seems to give a little more information:
    # dmesg
    [ 2500.090650] wlan0: authenticate with <network_2 mac address>
    [ 2500.109377] wlan0: send auth to <network_2 mac address> (try 1/3)
    [ 2500.114053] wlan0: authenticated
    [ 2500.115817] wlan0: associate with <network_2 mac address> (try 1/3)
    [ 2500.121336] wlan0: RX AssocResp from <network_2 mac address> (capab=0x431 status=0 aid=3)
    [ 2500.147262] wlan0: associated
    [ 2500.303529] wlan0: AP <network_2 mac address> changed bandwidth, new config is 2412 MHz, width 1 (2412/0 MHz)
    [ 2500.303542] wlan0: AP <network_2 mac address> changed bandwidth in a way we can't support - disconnect
    [ 2500.327471] cfg80211: Calling CRDA to update world regulatory domain
    [ 2769.285673] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
    [ 2769.285908] iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
    [ 2769.488380] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
    Any pointers and solutions are greatly appreciated.
    Thanks,
    diiis
    Last edited by diiis (2013-05-23 16:45:47)

    @silverzhao I use a manual dhcpcd/wpa_supplicant way of setting up my wlan0 using http://git.r-36.net/conn and I have the same problem.
    I have to kill my wireless and restart after seeing a message like:
    May 20 10:12:33 x220 kernel: wlan0: AP a4:b1:e9:55:25:2f changed bandwidth, new config is 2462 MHz, width 2 (2452/0 MHz)

  • Cisco 867VAE drops connection on DHCP lease timeout

    Hey!
    We have a very annoying problem on our hands. I'm no IOS expert, but I make do.
    We've got a Telia DSL connection that has a 20 minute DHCP lease timer. Every 20 minutes when it shakes hand again, the connection drops for about 5 seconds. This because the Cisco thinks that administratively shutting down the interface is a good idea....
    How do I stop this behavior? I've tried manually setting <ip dhcp client lease 1 0 0> (for 1 day lease) but it completely disregards that.
    Best would obviously be to stop it shutting down the interface every time, but worst case scenario I'll take a solution with a longer DHCP lease since the address rarely changes.
    <snip from log>
    *Aug  1 01:44:43.514 PCTime: %DHCP-6-ADDRESS_ASSIGN: Interface ATM0.1 assigned DHCP address 81.230.xxx.xx, mask 255.255.255.0, hostname elsa
    *Aug  1 02:04:48.498 PCTime: %DHCP-5-RESTART: Interface ATM0.1 is being restarted by DHCP
    *Aug  1 02:04:56.106 PCTime: %DHCP-6-ADDRESS_ASSIGN: Interface ATM0.1 assigned DHCP address 81.230.xxx.xx, mask 255.255.255.0, hostname elsa
    *Aug  1 02:25:01.050 PCTime: %DHCP-5-RESTART: Interface ATM0.1 is being restarted by DHCP
    </snip>
    It's running firmware c860vae-ipbasek9-mz.153-2
    I'm attaching the current running-config as well.
    Thank you in advance!
    Best Regards
    Daniel

    I'm sorry for not reporting in. The case is closed at Cisco and they simply couldn't do anything. The router does, according to the debug logs, send dhcp renew requests, but the ISP doesn't reply to them. If they get lost on the way, or if there's an incompatability with the ISP, I dunno. I heavily doubt it, since Telia (Swedish ISP) used Cisco gear for pretty much everything.
    Also, Telia will not reply to anything like this, since they don't support equipment they don't supply.
    So I'm completely at a loss, and will remain there until I stumble across something.
    I've received an 887M router though, which I'm gonna test. But I'm currently stuck with the fact that it's not supported anymore, and therefor I can't seem to download new IOS software (it uses a very old one).
    This is the last reply I got before they closed my case:
    *Aug 27 14:56:15.751 PCTime: DHCP Ack Message
    *Aug 27 14:56:15.751 PCTime: DHCP: Lease Seconds: 1200
    *Aug 27 14:56:15.751 PCTime: DHCP: Server ID Option: 213.66.241.86
    *Aug 27 14:56:18.751 PCTime: DHCPD: IP address change on interface ATM0.1
    *Aug 27 14:56:18.751 PCTime: DHCPD: IP address change on interface ATM0.1
    *Aug 27 14:56:18.751 PCTime: DHCP: Releasing ipl options:
    *Aug 27 14:56:18.751 PCTime: DHCP: Applying DHCP options:
    *Aug 27 14:56:18.751 PCTime:   Setting default_gateway to 81.230.121.65
    *Aug 27 14:56:18.751 PCTime:   Adding default route 81.230.121.65
    *Aug 27 14:56:19.751 PCTime:   Adding route to DHCP server 213.66.241.86 via ATM0.1 81.230.121.65
    *Aug 27 14:56:19.751 PCTime:   Adding DNS server address 195.67.199.39
    *Aug 27 14:56:19.751 PCTime:   Adding DNS server address 195.67.199.40
    *Aug 27 14:56:19.751 PCTime: DHCP: Sending notification of ASSIGNMENT:
    *Aug 27 14:56:19.751 PCTime:   Address 81.230.121.83 mask 255.255.255.192
    *Aug 27 14:56:19.751 PCTime: DHCP Client Pooling: ***Allocated IP address: 81.230.121.83
    *Aug 27 14:56:19.803 PCTime: Allocated IP address = 81.230.121.83  255.255.255.192
    *Aug 27 14:56:19.803 PCTime: %DHCP-6-ADDRESS_ASSIGN: Interface ATM0.1 assigned DHCP address 81.230.121.83, mask 255.255.255.192, hostname elsa
    *Aug 27 14:56:25.751 PCTime: DHCP: Client socket is closed
    *Aug 27 15:06:18.759 PCTime: DHCP: Client socket is opened
    *Aug 27 15:06:19.759 PCTime: DHCP: QScan: Bound..T1 fired..Renewing
    *Aug 27 15:06:19.759 PCTime: DHCP: SRequest attempt # 1 for entry:
    *Aug 27 15:06:19.759 PCTime: Temp IP addr: 81.230.121.83  for peer on Interface: ATM0.1
    *Aug 27 15:06:19.759 PCTime: Temp  sub net mask: 255.255.255.192
    *Aug 27 15:06:19.759 PCTime:    DHCP Lease server: 213.66.241.86, state: 7 Renewing
    *Aug 27 15:06:19.759 PCTime:    DHCP transaction id: 914
    *Aug 27 15:06:19.759 PCTime:    Lease: 1200 secs,  Renewal: 600 secs,  Rebind: 1050 secs
    *Aug 27 15:06:19.759 PCTime: Temp default-gateway addr: 81.230.121.65
    *Aug 27 15:06:19.759 PCTime:    Next timer fires after: 00:03:46
    *Aug 27 15:06:19.759 PCTime:    Retry count: 1   Client-ID: cisco-d48c.b524.7b17-AT0.1
    *Aug 27 15:06:19.759 PCTime:    Client-ID hex dump: 636973636F2D643438632E623532342E
    *Aug 27 15:06:19.759 PCTime:                        376231372D4154302E31
    *Aug 27 15:06:19.759 PCTime:    Hostname: elsa
    *Aug 27 15:06:19.759 PCTime: DHCP: SRequest - ciaddr: 81.230.121.83
    *Aug 27 15:06:19.759 PCTime: DHCP: SRequest: 293 bytes
    *Aug 27 15:06:19.759 PCTime: DHCP: SRequest: 293 bytes
    *Aug 27 15:06:30.759 PCTime: DHCP: Client socket is closed
    *Aug 27 15:10:04.759 PCTime: DHCP: Client socket is opened
    *Aug 27 15:10:05.759 PCTime: DHCP: QScan: Renewal..Retrying
    *Aug 27 15:10:05.759 PCTime: DHCP: SRequest attempt # 2 for entry:
    *Aug 27 15:10:05.759 PCTime: Temp IP addr: 81.230.121.83  for peer on Interface: ATM0.1
    *Aug 27 15:10:05.759 PCTime: Temp  sub net mask: 255.255.255.192
    *Aug 27 15:10:05.759 PCTime:    DHCP Lease server: 213.66.241.86, state: 7 Renewing
    *Aug 27 15:10:05.759 PCTime:    DHCP transaction id: 914
    *Aug 27 15:10:05.759 PCTime:    Lease: 1200 secs,  Renewal: 600 secs,  Rebind: 1050 secs
    *Aug 27 15:10:05.759 PCTime: Temp default-gateway addr: 81.230.121.65
    *Aug 27 15:10:05.759 PCTime:    Next timer fires after: 00:01:53
    *Aug 27 15:10:05.759 PCTime:    Retry count: 2   Client-ID: cisco-d48c.b524.7b17-AT0.1
    *Aug 27 15:10:05.759 PCTime:    Client-ID hex dump: 636973636F2D643438632E623532342E
    *Aug 27 15:10:05.759 PCTime:                        376231372D4154302E31
    *Aug 27 15:10:05.759 PCTime:    Hostname: elsa
    *Aug 27 15:10:05.759 PCTime: DHCP: SRequest - ciaddr: 81.230.121.83
    *Aug 27 15:10:05.759 PCTime: DHCP: SRequest: 293 bytes
    *Aug 27 15:10:05.759 PCTime: DHCP: SRequest: 293 bytes
    *Aug 27 15:10:16.759 PCTime: DHCP: Client socket is closed
    *Aug 27 15:11:57.759 PCTime: DHCP: Client socket is opened
    *Aug 27 15:11:58.759 PCTime: DHCP: QScan: Renewal..Retrying
    *Aug 27 15:11:58.759 PCTime: DHCP: SRequest attempt # 3 for entry:
    As pointed to you in my previous mails  renews/packets are being sent and as router is not getting back any reply, lease is timing out and that’s  the reason why the interface is getting flapped. You need to find with ISP  why the renews and rebind packets are not responded to by Providers DHCP server.
    Hope this clarifies your query.
    Thanks and regards,
    Lijesh

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