搬到新地方后，我一直无法让 wifi 正常工作。我的笔记本电脑可以找到网络并连接到它，但没有数据传输。它暂时可以工作，但每次只能持续一两秒钟。清除并重新安装 resolvconf 后，我最多可以工作 10 分钟，但现在又断线了。
正在 ping 8.8.8.8 结果：
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
12 packets transmitted, 0 received, 100% packet loss, time 16100ms
Pinging 192.168.0.1 results:
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
From 192.168.0.102 icmp_seq=1 Destination Host Unreachable
From 192.168.0.102 icmp_seq=2 Destination Host Unreachable
From 192.168.0.102 icmp_seq=3 Destination Host Unreachable
^C
--- 192.168.0.1 ping statistics ---
5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4023ms
pipe 3
我的 android 设备和其他设备在网络上运行正常，我的 ubuntu 也没有遇到其他网络问题。
不幸的是，我的情况是无法修改网络本身，但由于其他设备运行良好，所以我怀疑问题不在这里。
我对 Ubuntu 网络不是很熟悉，所以即使我尝试查看这里的讨论和其他问题，也可能遗漏了一些简单的东西。谢谢大家的帮助。
以下是来自 wifi 脚本的报告：
########## wireless info START ##########
Report from: 04 Aug 2015 20:14 EEST +0300
Booted last: 04 Aug 2015 19:47 EEST +0300
Script from: 14 Jul 2015 17:04 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 3.16.0-45-generic #60~14.04.1-Ubuntu SMP Fri Jul 24 21:16:23 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 73)
Subsystem: Intel Corporation Wireless-N 7260 [8086:4262]
Kernel driver in use: iwlwifi
##### lsusb #############################
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 003: ID 8087:07dc Intel Corp.
Bus 002 Device 002: ID 0bda:572a Realtek Semiconductor Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
3: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
##### lsmod #############################
iwlmvm 217725 0
mac80211 652777 1 iwlmvm
iwlwifi 179412 1 iwlmvm
cfg80211 498458 3 iwlwifi,mac80211,iwlmvm
wmi 19193 0
ideapad_laptop 18278 0
sparse_keymap 13948 1 ideapad_laptop
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
wlan0 Link encap:Ethernet HWaddr <MAC 'wlan0' [IF]>
inet addr:192.168.43.63 Bcast:192.168.43.255 Mask:255.255.255.0
inet6 addr: fe80::<IP6 'wlan0' [IF]>/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1541 errors:0 dropped:0 overruns:0 frame:0
TX packets:2888 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:968332 (968.3 KB) TX bytes:426996 (426.9 KB)
##### iwconfig ##########################
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"AndroidAP"
Mode:Managed Frequency:2.437 GHz Access Point: <MAC 'AndroidAP' [AC1]>
Bit Rate=72.2 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=67/70 Signal level=-43 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:64 Missed beacon:0
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.43.1 0.0.0.0 UG 0 0 0 wlan0
192.168.43.0 0.0.0.0 255.255.255.0 U 9 0 0 wlan0
##### resolv.conf #######################
nameserver 127.0.1.1
##### network managers ##################
Installed:
NetworkManager
Running:
root 855 1 0 19:47 ? 00:00:01 NetworkManager
##### NetworkManager info ###############
** (process:3553): WARNING **: error: cannot retrieve connection: uid 1000 has no permission to perform this operation
NetworkManager Tool
State: connected (global)
- Device: wlan0 [AndroidAP] ---------------------------------------------------
Type: 802.11 WiFi
Driver: iwlwifi
State: connected
Default: yes
HW Address: <MAC 'wlan0' [IF]>
Capabilities:
Speed: 72 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
Blink1861D1: Infra, <MAC 'Blink1861D1' [AC2]>, Freq 2412 MHz, Rate 54 Mb/s, Strength 52 WEP
bob-net-no-3-03-227742-colocatio: Infra, <MAC 'bob-net-no-3-03-227742-colocatio' [AC3]>, Freq 2437 MHz, Rate 54 Mb/s, Strength 74 WPA2
*AndroidAP: Infra, <MAC 'AndroidAP' [AC1]>, Freq 2437 MHz, Rate 54 Mb/s, Strength 76 WPA2
IPv4 Settings:
Address: 192.168.43.63
Prefix: 24 (255.255.255.0)
Gateway: 192.168.43.1
DNS: 192.168.43.1
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/bob-net-no-3-03-227742-colocatio]] (600 root)
[connection] id=bob-net-no-3-03-227742-colocatio | type=802-11-wireless
[802-11-wireless] ssid=bob-net-no-3-03-227742-colocatio | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/vodafone3B54]] (600 root)
[connection] id=vodafone3B54 | type=802-11-wireless
[802-11-wireless] ssid=vodafone3B54 | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/bob-net-no-3-03-227742-colocatio 1]] (600 root)
[connection] id=bob-net-no-3-03-227742-colocatio 1 | type=802-11-wireless
[802-11-wireless] ssid=bob-net-no-3-03-227742-colocatio | mac-address=<MAC 'wlan0' [IF]>
[ipv6] method=auto
[ipv4] method=auto
##### iw reg get ########################
Region: Europe/Helsinki (based on set time zone)
country 00:
(2402 - 2472 @ 40), (3, 20)
(2457 - 2482 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
(5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
##### iwlist channels ###################
lo no frequency information.
wlan0 13 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Current Frequency:2.437 GHz (Channel 6)
##### iwlist scan #######################
lo Interface doesn't support scanning.
Channel occupancy:
1 APs on Frequency:2.412 GHz (Channel 1)
2 APs on Frequency:2.437 GHz (Channel 6)
wlan0 Scan completed :
Cell 01 - Address: <MAC 'AndroidAP' [AC1]>
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=66/70 Signal level=-44 dBm
Encryption key:on
ESSID:"AndroidAP"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000000043710d9
Extra: Last beacon: 32ms ago
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Cell 02 - Address: <MAC 'Blink1861D1' [AC2]>
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=41/70 Signal level=-69 dBm
Encryption key:on
ESSID:"Blink1861D1"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=0000000396e5c4d1
Extra: Last beacon: 32ms ago
Cell 03 - Address: <MAC 'bob-net-no-3-03-227742-colocatio' [AC3]>
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=67/70 Signal level=-43 dBm
Encryption key:on
ESSID:"bob-net-no-3-03-227742-colocatio"
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
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000003971b1b6f
Extra: Last beacon: 32ms ago
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
##### module infos ######################
[iwlmvm]
filename: /lib/modules/3.16.0-45-generic/kernel/drivers/net/wireless/iwlwifi/mvm/iwlmvm.ko
license: GPL
author: Copyright(c) 2003- 2014 Intel Corporation <[email protected]>
version: in-tree:
description: The new Intel(R) wireless AGN driver for Linux
srcversion: C3CE81DD94553577D83E97E
depends: iwlwifi,mac80211,cfg80211
intree: Y
vermagic: 3.16.0-45-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: C1:A3:1E:DB:9F:C4:C6:4E:2D:95:A7:FF:18:A6:73:D1:8C:AB:15:A6
sig_hashalgo: sha512
parm: init_dbg:set to true to debug an ASSERT in INIT fw (default: false (bool)
parm: power_scheme:power management scheme: 1-active, 2-balanced, 3-low power, default: 2 (int)
[mac80211]
filename: /lib/modules/3.16.0-45-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: 315DCE1E2614AE1F38132D3
depends: cfg80211
intree: Y
vermagic: 3.16.0-45-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: C1:A3:1E:DB:9F:C4:C6:4E:2D:95:A7:FF:18:A6:73:D1:8C:AB:15:A6
sig_hashalgo: sha512
parm: max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm: max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm: beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm: probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm: ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
[iwlwifi]
filename: /lib/modules/3.16.0-45-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
license: GPL
author: Copyright(c) 2003- 2014 Intel Corporation <[email protected]>
version: in-tree:
description: Intel(R) Wireless WiFi driver for Linux
firmware: iwlwifi-100-5.ucode
firmware: iwlwifi-1000-5.ucode
firmware: iwlwifi-135-6.ucode
firmware: iwlwifi-105-6.ucode
firmware: iwlwifi-2030-6.ucode
firmware: iwlwifi-2000-6.ucode
firmware: iwlwifi-5150-2.ucode
firmware: iwlwifi-5000-5.ucode
firmware: iwlwifi-6000g2b-6.ucode
firmware: iwlwifi-6000g2a-5.ucode
firmware: iwlwifi-6050-5.ucode
firmware: iwlwifi-6000-4.ucode
firmware: iwlwifi-7265-9.ucode
firmware: iwlwifi-3160-9.ucode
firmware: iwlwifi-7260-9.ucode
firmware: iwlwifi-8000-8.ucode
srcversion: 93D664267873827B22C4309
depends: cfg80211
intree: Y
vermagic: 3.16.0-45-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: C1:A3:1E:DB:9F:C4:C6:4E:2D:95:A7:FF:18:A6:73:D1:8C:AB:15:A6
sig_hashalgo: sha512
parm: swcrypto:using crypto in software (default 0 [hardware]) (int)
parm: 11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm: amsdu_size_8K:enable 8K amsdu size (default 0) (int)
parm: fw_restart:restart firmware in case of error (default true) (bool)
parm: antenna_coupling:specify antenna coupling in dB (defualt: 0 dB) (int)
parm: wd_disable:Disable stuck queue watchdog timer 0=system default, 1=disable (default: 1) (int)
parm: nvm_file:NVM file name (charp)
parm: uapsd_disable:disable U-APSD functionality (default: Y) (bool)
parm: bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm: led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm: power_save:enable WiFi power management (default: disable) (bool)
parm: power_level:default power save level (range from 1 - 5, default: 1) (int)
parm: fw_monitor:firmware monitor - to debug FW (default: false - needs lots of memory) (bool)
[cfg80211]
filename: /lib/modules/3.16.0-45-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: D48679749A6B8B822E391CA
depends:
intree: Y
vermagic: 3.16.0-45-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: C1:A3:1E:DB:9F:C4:C6:4E:2D:95:A7:FF:18:A6:73:D1:8C:AB:15:A6
sig_hashalgo: sha512
parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[iwlmvm]
init_dbg: N
power_scheme: 2
[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
probe_wait_ms: 500
[iwlwifi]
11n_disable: 0
amsdu_size_8K: 0
antenna_coupling: 0
bt_coex_active: Y
fw_monitor: N
fw_restart: Y
led_mode: 0
nvm_file: (null)
power_level: 0
power_save: N
swcrypto: 0
uapsd_disable: Y
wd_disable: 1
[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
lp
rtc
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en
[/etc/modprobe.d/modesetting.conf]
options cirrus modeset=1
options mgag200 modeset=1
##### rc.local ##########################
exit 0
##### pm-utils ##########################
##### udev rules ########################
[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x8086:0x08b2 (iwlwifi)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'wlan0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
##### dmesg #############################
[ 732.387498] wlan0: deauthenticating from <MAC 'bob-net-no-3-03-227742-colocatio' [AC3]> by local choice (Reason: 3=DEAUTH_LEAVING)
[ 733.152653] wlan0: authenticate with <MAC 'bob-net-no-3-03-227742-colocatio' [AC3]>
[ 733.155625] wlan0: send auth to <MAC 'bob-net-no-3-03-227742-colocatio' [AC3]> (try 1/3)
[ 733.157833] wlan0: authenticated
[ 733.160589] wlan0: associate with <MAC 'bob-net-no-3-03-227742-colocatio' [AC3]> (try 1/3)
[ 733.167774] wlan0: RX AssocResp from <MAC 'bob-net-no-3-03-227742-colocatio' [AC3]> (capab=0x31 status=0 aid=2)
[ 733.170123] wlan0: associated
[ 1535.375017] wlan0: deauthenticating from <MAC 'bob-net-no-3-03-227742-colocatio' [AC3]> by local choice (Reason: 3=DEAUTH_LEAVING)
[ 1536.145109] wlan0: authenticate with <MAC 'AndroidAP' [AC1]>
[ 1536.147831] wlan0: send auth to <MAC 'AndroidAP' [AC1]> (try 1/3)
[ 1536.150625] wlan0: authenticated
[ 1536.154594] wlan0: associate with <MAC 'AndroidAP' [AC1]> (try 1/3)
[ 1536.168542] wlan0: RX AssocResp from <MAC 'AndroidAP' [AC1]> (capab=0x8431 status=0 aid=1)
[ 1536.168930] wlan0: associated
########## wireless info END ############
答案1
您需要禁用驱动程序的某些选项。
在终端中运行
sudo -H gedit /etc/modprobe.d/iwlwifi.conf
编辑器将打开。粘贴此文本
# /etc/modprobe.d/iwlwifi.conf
# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
# microcode file installed on the system. When removing iwlwifi, first
# remove the iwl?vm module and then iwlwifi.
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
options iwlwifi 11n_disable=1 bt_coex_active=0 power_save=0 swcrypto=1
保存文件并重新启动。
我在最后一行禁用了所有可能造成问题的选项。您可以删除其中一些并测试是否需要这样做。但它应该以这种方式工作。
更新：对于内核 4.2，这些选项是不需要的。Intel 7260 开箱即用。
你可以通过运行以下命令将内核更新至 4.2：
sudo apt-get install linux-generic-lts-wily
对于某些国家代码，可能还会存在区域限制问题。您可以使用这个答案如果这对你造成影响。
我也发现这个uapsd功能也很好用。默认情况下它是禁用的，但可以通过以下方式启用：
sudo tee /etc/modprobe.d/iwlwifi-opt.conf <<< "uapsd_disable=N"
但它有可能无法与所有接入点配合良好。uapsd可以在某些情况下节省一些电量。
答案2
我已采取了之前提到的一些步骤。阅读时我注意到提到了 5GHz 频率。我在热点设置中将我的接入点 [运行 CyanogenMod 6.0.0 的 HTC One M8 上的 Android 热点] 切换到 5GHz 频段，问题就消失了。维基百科清楚地表明，只有在确保 WiFi 网络不会干扰使用相同频率的任何其他 802.11 或非 802.11（如蓝牙）系统的情况下，才应使用 2.4 GHz 频率。