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Lauradev's questions

Martin Hope
Lauradev
Asked: 2020-04-23 04:48:50 +0800 CST
  • 1

I have a computer with 3 network interfaces:

  • eth_adsl : Ethernet interface linked with my ADSL box
  • eth_local : Ethernet interface linked with my local network
  • wlan_local : WIFI interface for my local network

This computer is a gateway for other computer (and devices) in my local network. It forwards paquets coming from and sending to Internet. With the WIFI of this computer I want to make an AP (Access Point). In order to simplify the configuration, I used a bridge between both local interfaces (see /etc/network interfaces below)

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# Interface de boucle local
auto lo
iface lo inet loopback

# Interface Ethernet secondaire 
# interface de connection a Internet
auto eth_adsl
iface eth_adsl inet dhcp

# WIFI
iface wlan_local inet static
        wireless-mode master

#Bridge
auto 
bridge_local
iface bridge_local inet static
        address 192.168.0.1
        netmask 255.255.255.0
        broadcast 192.168.0.255
        bridge_ports eth_local wlan_local
        post-up /etc/init.d/isc-dhcp-server start
        pre-down /etc/init.d/isc-dhcp-server stop

In my DHCP server I've made the following configuration (/etc/default/isc-dhcp-server)

INTERFACES= "bridge_local"

The result: Other computers linked with ethernet in the local network work perfectly but computers trying to connect through WIFI don't work. They can associate with the AP but after it's impossible to get a valid IP. So it seems that the DHCP doesn't work with the interface wlan_local.... Which is strange because I don't have any error message with DHCP in /var/log/syslog

I have been stuck for several days with this problem. Do you have any idea or test in mind? Thanks a lot

My distribution is Ubuntu 16.04.6 LTS

networking wireless network-manager dhcp network-bridge
Martin Hope
Lauradev
Asked: 2020-04-21 11:43:22 +0800 CST
  • 3

I want to make a WiFi Access Point with Ubuntu 16.04.6 LTS, hostapd and this PCIe WiFi card which supports 802.11a/b/g/n:

Network controller: Qualcomm Atheros AR9462 Wireless Network Adapter (rev 01)

You will find below the result for the command iw list

Wiphy phy0
    max # scan SSIDs: 4
    max scan IEs length: 2257 bytes
    Retry short limit: 7
    Retry long limit: 4
    Coverage class: 0 (up to 0m)
    Device supports RSN-IBSS.
    Device supports AP-side u-APSD.
    Device supports T-DLS.
    Supported Ciphers:
            * WEP40 (00-0f-ac:1)
            * WEP104 (00-0f-ac:5)
            * TKIP (00-0f-ac:2)
            * CCMP (00-0f-ac:4)
            * 00-0f-ac:10
            * GCMP (00-0f-ac:8)
            * 00-0f-ac:9
            * CMAC (00-0f-ac:6)
            * 00-0f-ac:13
            * 00-0f-ac:11
            * 00-0f-ac:12
    Available Antennas: TX 0x3 RX 0x3
    Configured Antennas: TX 0x3 RX 0x3
    Supported interface modes:
             * IBSS
             * managed
             * AP
             * AP/VLAN
             * monitor
             * mesh point
             * P2P-client
             * P2P-GO
             * Unknown mode (11)
    Band 1:
            Capabilities: 0x11ef
                    RX LDPC
                    HT20/HT40
                    SM Power Save disabled
                    RX HT20 SGI
                    RX HT40 SGI
                    TX STBC
                    RX STBC 1-stream
                    Max AMSDU length: 3839 bytes
                    DSSS/CCK HT40
            Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
            Minimum RX AMPDU time spacing: 8 usec (0x06)
            HT TX/RX MCS rate indexes supported: 0-15
            Bitrates (non-HT):
                    * 1.0 Mbps
                    * 2.0 Mbps (short preamble supported)
                    * 5.5 Mbps (short preamble supported)
                    * 11.0 Mbps (short preamble supported)
                    * 6.0 Mbps
                    * 9.0 Mbps
                    * 12.0 Mbps
                    * 18.0 Mbps
                    * 24.0 Mbps
                    * 36.0 Mbps
                    * 48.0 Mbps
                    * 54.0 Mbps
            Frequencies:
                    * 2412 MHz [1] (20.0 dBm)
                    * 2417 MHz [2] (20.0 dBm)
                    * 2422 MHz [3] (20.0 dBm)
                    * 2427 MHz [4] (20.0 dBm)
                    * 2432 MHz [5] (20.0 dBm)
                    * 2437 MHz [6] (20.0 dBm)
                    * 2442 MHz [7] (20.0 dBm)
                    * 2447 MHz [8] (20.0 dBm)
                    * 2452 MHz [9] (20.0 dBm)
                    * 2457 MHz [10] (20.0 dBm)
                    * 2462 MHz [11] (20.0 dBm)
                    * 2467 MHz [12] (20.0 dBm) (no IR)
                    * 2472 MHz [13] (20.0 dBm) (no IR)
                    * 2484 MHz [14] (disabled)
    Band 2:
            Capabilities: 0x11ef
                    RX LDPC
                    HT20/HT40
                    SM Power Save disabled
                    RX HT20 SGI
                    RX HT40 SGI
                    TX STBC
                    RX STBC 1-stream
                    Max AMSDU length: 3839 bytes
                    DSSS/CCK HT40
            Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
            Minimum RX AMPDU time spacing: 8 usec (0x06)
            HT TX/RX MCS rate indexes supported: 0-15
            Bitrates (non-HT):
                    * 6.0 Mbps
                    * 9.0 Mbps
                    * 12.0 Mbps
                    * 18.0 Mbps
                    * 24.0 Mbps
                    * 36.0 Mbps
                    * 48.0 Mbps
                    * 54.0 Mbps
            Frequencies:
                    * 5180 MHz [36] (18.0 dBm) (no IR)
                    * 5200 MHz [40] (18.0 dBm) (no IR)
                    * 5220 MHz [44] (18.0 dBm) (no IR)
                    * 5240 MHz [48] (18.0 dBm) (no IR)
                    * 5260 MHz [52] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5280 MHz [56] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5300 MHz [60] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5320 MHz [64] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5500 MHz [100] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5520 MHz [104] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5540 MHz [108] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5560 MHz [112] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5580 MHz [116] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5600 MHz [120] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5620 MHz [124] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5640 MHz [128] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5660 MHz [132] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5680 MHz [136] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5700 MHz [140] (18.0 dBm) (no IR, radar detection)
                      DFS state: usable (for 1656 sec)
                      DFS CAC time: 60000 ms
                    * 5745 MHz [149] (disabled)
                    * 5765 MHz [153] (disabled)
                    * 5785 MHz [157] (disabled)
                    * 5805 MHz [161] (disabled)
                    * 5825 MHz [165] (disabled)
    Supported commands:
             * new_interface
             * set_interface
             * new_key
             * start_ap
             * new_station
             * new_mpath
             * set_mesh_config
             * set_bss
             * authenticate
             * associate
             * deauthenticate
             * disassociate
             * join_ibss
             * join_mesh
             * remain_on_channel
             * set_tx_bitrate_mask
             * frame
             * frame_wait_cancel
             * set_wiphy_netns
             * set_channel
             * set_wds_peer
             * tdls_mgmt
             * tdls_oper
             * probe_client
             * set_noack_map
             * register_beacons
             * start_p2p_device
             * set_mcast_rate
             * connect
             * disconnect
             * channel_switch
             * Unknown command (104)
             * Unknown command (121)
    Supported TX frame types:
             * IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
             * managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
             * AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
             * AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
             * mesh point: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
             * P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
             * P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
             * P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
    Supported RX frame types:
             * IBSS: 0x40 0xb0 0xc0 0xd0
             * managed: 0x40 0xd0
             * AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
             * AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
             * mesh point: 0xb0 0xc0 0xd0
             * P2P-client: 0x40 0xd0
             * P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
             * P2P-device: 0x40 0xd0
    WoWLAN support:
             * wake up on disconnect
             * wake up on magic packet
             * wake up on pattern match, up to 14 patterns of 1-256 bytes,
               maximum packet offset 0 bytes
    software interface modes (can always be added):
             * AP/VLAN
             * monitor
    valid interface combinations:
             * #{ managed } <= 2048, #{ AP, mesh point } <= 8, #{ P2P-client, P2P-GO } <= 1,
               total <= 2048, #channels <= 1, STA/AP BI must match
    HT Capability overrides:
             * MCS: ff ff ff ff ff ff ff ff ff ff
             * maximum A-MSDU length
             * supported channel width
             * short GI for 40 MHz
             * max A-MPDU length exponent
             * min MPDU start spacing
    Device supports TX status socket option.
    Device supports HT-IBSS.
    Device supports SAE with AUTHENTICATE command
    Device supports low priority scan.
    Device supports scan flush.
    Device supports AP scan.
    Device supports per-vif TX power setting
    P2P GO supports CT window setting
    Driver supports full state transitions for AP/GO clients
    Driver supports a userspace MPM
    Device supports active monitor (which will ACK incoming frames)
    Driver/device bandwidth changes during BSS lifetime (AP/GO mode)

I have written the following hostapd.conf

#the interface used by the AP
interface=wlan_local

# "a" simply means 5GHz
hw_mode=a

# the channel to use, 0 means the AP will search for the channel with the least interferences (ACS)
channel=40
ieee80211d=1
country_code=FR
ieee80211n=1

# 802.11ac support
ieee80211ac=1
wmm_enabled=1

ssid=MYSSID
auth_algs=1
wpa=2
wpa_key_mgmt=WPA-PSK
rsn_pairwise=CCMP
wpa_passphrase=MYPASSWORD

I tried with different channels from 0 to 40, but I still have the following message when I start the service hostapd

hostapd[1937]: wlan_local: IEEE 802.11 Configured channel (40) not found from the channel list of current mode (2) IEEE 802.11a
hostapd[1937]: wlan_local: IEEE 802.11 Hardware does not support configured channel

Do you have any idea? Thanks

networking wireless wireless-access-point hostapd