Arch Linux

matoxxx

Member

Registered: 2014-06-19

Posts: 12

[SOLVED] 5Ghz ac wireless network and DHCP renew problem

Edit
I have now tried the adapter on a wpa-configsection network (eduroam) and it works fine. Looks like it is a virgin media hardware related issue. I have seen some posts reporting similar problems on virgin forums. Closing as is unrelated to arch.

Hello,

can you please help me identify problems with my network. I have Virgin Media Superhub 2 AC and bought Alfa Network AWUS036AC usb wifi adapter to use on 5GHz network. When I use WPA2 or WPA/WPA2 with the 5GHz network I get dissociation/association every ~5min. I have pinned down the problem to DHCP client not responding to DHCP renew from the AP. There are no problems when using 5GHz without WPA, or using 2.4GHz with WPA. Both dhclient or dhcpcd behave the same.

uname -a

Linux arch-mz 4.8.13-1-ARCH #1 SMP PREEMPT Fri Dec 9 07:24:34 CET 2016 x86_64 GNU/Linux

modules used by the device

rtl8812au_rtl8821au, 4.3.20.r16.d716b38, 4.8.13-1-ARCH, x86_64: installed

lsusb

Bus 001 Device 002: ID 0bda:8812 Realtek Semiconductor Corp. RTL8812AU 802.11a/b/g/n/ac WLAN Adapter
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0bda Realtek Semiconductor Corp.
  idProduct          0x8812 RTL8812AU 802.11a/b/g/n/ac WLAN Adapter
  bcdDevice            0.00
  iManufacturer           1 Realtek
  iProduct                2 802.11n NIC
  iSerial                 3 123456
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           53
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           5
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0002
  (Bus Powered)
  Remote Wakeup Enabled

relevant snippet from journalctl

Jan 15 23:56:29 arch-mz kernel: RTL871X: OnDisassoc(wlp0s20u1) reason=4, ta=80:37:73:70:24:20
Jan 15 23:56:33 arch-mz kernel: RTL871X: rtw_set_802_11_connect(wlp0s20u1)  fw_state=0x00000008
Jan 15 23:56:34 arch-mz kernel: RTL871X: start auth
Jan 15 23:56:34 arch-mz kernel: RTL871X: auth success, start assoc
Jan 15 23:56:34 arch-mz kernel: RTL871X: rtw_cfg80211_indicate_connect(wlp0s20u1) BSS not found !!
Jan 15 23:56:34 arch-mz kernel: RTL871X: assoc success
Jan 15 23:56:34 arch-mz kernel: RTL871X: recv eapol packet
Jan 15 23:56:34 arch-mz kernel: RTL871X: send eapol packet
Jan 15 23:56:34 arch-mz kernel: RTL871X: recv eapol packet
Jan 15 23:56:34 arch-mz kernel: RTL871X: send eapol packet
Jan 15 23:56:34 arch-mz kernel: RTL871X: set pairwise key camid:4, addr:80:37:73:70:24:20, kid:0, type:AES
Jan 15 23:56:34 arch-mz kernel: RTL871X: set group key camid:5, addr:80:37:73:70:24:20, kid:2, type:AES

Network log entry from the AP when this happens

DHCP RENEW sent - No response for IPv4

Thank you

Last edited by matoxxx (2017-01-16 17:24:08)