从今天早上开始我就无法连接互联网。但是，我可以访问本地网络，其他设备访问互联网也没有问题。我尝试重新启动，甚至关闭笔记本电脑一段时间，两个网络接口（eth0 和 wlan0）上都是同样的情况。我甚至尝试了另一个互联网连接。
预先感谢您的帮助。
跟踪路径：
% tracepath 192.168.1.1
1?: [LOCALHOST] pmtu 1500
1: forumanalogue.fr 1.592ms reached
1: forumanalogue.fr 1.359ms reached
Resume: pmtu 1500 hops 1 back 1
% tracepath 8.8.8.8
1?: [LOCALHOST] pmtu 1500
1: no reply
2: no reply
3: no reply
4: no reply
5: no reply
6: no reply
7: no reply
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500
更多信息：
% sudo lshw -C network
*-network
description: Ethernet interface
product: NetXtreme BCM57765 Gigabit Ethernet PCIe
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:01:00.0
logical name: eth0
version: 10
serial: 68:5b:35:96:f6:e1
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi msix pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.137 firmware=57765-v1.37 latency=0 link=no multicast=yes port=twisted pair
resources: irq:16 memory:a0400000-a040ffff memory:a0410000-a041ffff
*-network
description: Wireless interface
product: BCM4331 802.11a/b/g/n
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: 02
serial: a8:86:dd:93:41:6c
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=wl0 driverversion=6.30.223.248 (r487574) ip=192.168.1.5 latency=0 multicast=yes wireless=IEEE 802.11abg
resources: irq:17 memory:a0600000-a0603fff
% sudo ifconfig
eth0 Link encap:Ethernet HWaddr 68:5b:35:96:f6:e1
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:16
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:5074 errors:0 dropped:0 overruns:0 frame:0
TX packets:5074 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1602881 (1.6 MB) TX bytes:1602881 (1.6 MB)
wlan0 Link encap:Ethernet HWaddr a8:86:dd:93:41:6c
inet addr:192.168.1.5 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::aa86:ddff:fe93:416c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:23639 errors:0 dropped:0 overruns:0 frame:1319
TX packets:20794 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:28913966 (28.9 MB) TX bytes:2315442 (2.3 MB)
Interrupt:17
% cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
奇怪？wlan0 在哪里？虽然我可以访问本地网络。
% sudo nm-tool
NetworkManager Tool
State: connected (global)
- Device: 30:76:6F:0A:8D:02 ----------------------------------------------------
Type: Bluetooth
Driver: bluez
State: disconnected
Default: no
Capabilities:
- Device: wlan0 [Bbox-A7B38DFF-5GHz] ------------------------------------------
Type: 802.11 WiFi
Driver: wl
State: connected
Default: yes
HW Address: A8:86:DD:93:41:6C
Capabilities:
Speed: 300 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
Bbox-A7B38DFF: Infra, 5C:A3:9D:85:40:98, Freq 2412 MHz, Rate 54 Mb/s, Strength 100 WPA WPA2
Bbox-0A2E264B-5GHz: Infra, 64:7C:34:33:4C:30, Freq 5180 MHz, Rate 54 Mb/s, Strength 60 WPA WPA2
Bbox-0A2E264B: Infra, 64:7C:34:33:4C:2C, Freq 2462 MHz, Rate 54 Mb/s, Strength 55 WPA WPA2
SFR-0313: Infra, FC:B4:E6:3B:0A:C1, Freq 5240 MHz, Rate 54 Mb/s, Strength 39 WPA WPA2
SFR-0313: Infra, 00:37:B7:51:03:19, Freq 2412 MHz, Rate 54 Mb/s, Strength 45 WPA WPA2
Bbox-233A6BC7: Infra, E8:BE:81:AF:55:40, Freq 2412 MHz, Rate 54 Mb/s, Strength 42 WPA WPA2
freebox_PVAGJE: Infra, 00:24:D4:6B:77:C4, Freq 2432 MHz, Rate 54 Mb/s, Strength 27 WPA
SFR_80A0: Infra, 24:95:04:C9:80:A4, Freq 2437 MHz, Rate 54 Mb/s, Strength 27 WPA
SFR WiFi Mobile: Infra, D2:95:04:C9:80:A7, Freq 2437 MHz, Rate 54 Mb/s, Strength 25 WPA2 Enterprise
FreeWifi_secure: Infra, 00:24:D4:E6:E2:96, Freq 2447 MHz, Rate 54 Mb/s, Strength 24 WPA2 Enterprise
Bouygues Telecom Wi-Fi: Infra, 64:7C:34:33:4C:2D, Freq 2462 MHz, Rate 54 Mb/s, Strength 55
SFR WiFi FON: Infra, D2:95:04:C9:80:A5, Freq 2437 MHz, Rate 54 Mb/s, Strength 25
LG-E460_6416: Infra, 9A:D6:F7:ED:AA:63, Freq 2412 MHz, Rate 54 Mb/s, Strength 68 WPA2
Bbox-233A6BC7-5GHz: Infra, E8:BE:81:AF:55:44, Freq 5200 MHz, Rate 54 Mb/s, Strength 35 WPA WPA2
FreeWifi_secure: Infra, 00:24:D4:6B:77:C6, Freq 2432 MHz, Rate 54 Mb/s, Strength 27 WPA2 Enterprise
FreeWifi: Infra, 00:24:D4:6B:77:C5, Freq 2432 MHz, Rate 54 Mb/s, Strength 27
FreeWifi: Infra, 00:24:D4:E6:E2:95, Freq 2447 MHz, Rate 54 Mb/s, Strength 22
Freebox-AF55C5: Infra, 00:24:D4:E6:E2:94, Freq 2447 MHz, Rate 54 Mb/s, Strength 19 WPA
DOC: Infra, F4:CA:E5:87:F7:3C, Freq 2462 MHz, Rate 54 Mb/s, Strength 20 WPA
Bbox-AA1A1FAE: Infra, A0:1B:29:B1:59:20, Freq 2412 MHz, Rate 54 Mb/s, Strength 17 WPA WPA2
PIERREBRUN: Infra, 80:EA:96:F3:60:9A, Freq 2412 MHz, Rate 54 Mb/s, Strength 32 WPA WPA2
*Bbox-A7B38DFF-5GHz: Infra, 5C:A3:9D:85:40:90, Freq 5180 MHz, Rate 54 Mb/s, Strength 72 WPA WPA2
IPv4 Settings:
Address: 192.168.1.5
Prefix: 24 (255.255.255.0)
Gateway: 192.168.1.254
DNS: 127.0.0.1
DNS: 192.168.1.8
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: tg3
State: unavailable
Default: no
HW Address: 68:5B:35:96:F6:E1
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
答案1
在命令 iptables -L 奇怪地返回后，我发现文件 /etc/iptables/rules.v4 已损坏，因此我刷新规则 iptables -F 并添加正确的规则。