for two days, my laptop cannot connect to the internet (a.k.a. all machines beyond my router) anymore. I have investigated the following things:
- The network access worked fine half a week ago.
- I have no idea, what could have caused the outage.
- System: Ubuntu 14.04, XFCE, fully patched
- I can access just fine the router's web interface and even other machines in my home net
- I cannot reach any server outside, neither by name nor by IP.
- I added Google's
8.8.8.8
as DNS resolver, no change (no surprise after finding 5...) ufw
is disabled:$ sudo ufw status WARN: Doppeltes Profil 'Apache', zuletzt gefundenes wird verwendet WARN: Doppeltes Profil 'Apache Secure', zuletzt gefundenes wird verwendet WARN: Doppeltes Profil 'Apache Full', zuletzt gefundenes wird verwendet Status: Inaktiv
iptables
have no strange entries:$ sudo iptables-save *filter :INPUT ACCEPT [240:30526] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [2994769:4696400653] COMMIT
I checked with the router, there is no active firewall there. Also all other computers, each running Ubuntu, can connect to the net just fine.
There's no difference between
eth0
andwlan0
, both do not work.ifconfig
output:$ ifconfig eth0 Link encap:Ethernet HWaddr 00:17:a4:e8:2a:9c 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:18 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:229 errors:0 dropped:0 overruns:0 frame:0 TX packets:229 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:30871 (30.8 KB) TX bytes:30871 (30.8 KB) tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:10.8.0.6 P-t-P:10.8.0.5 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP 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:100 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) wlan0 Link encap:Ethernet HWaddr 00:1b:77:34:2f:09 inet addr:192.168.178.23 Bcast:192.168.178.255 Mask:255.255.255.0 inet6 addr: fe80::21b:77ff:fe34:2f09/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:188 errors:0 dropped:0 overruns:0 frame:0 TX packets:262 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:27175 (27.1 KB) TX bytes:35542 (35.5 KB)
Output of
route -n
:$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.8.0.5 128.0.0.0 UG 0 0 0 tun0 0.0.0.0 192.168.178.1 0.0.0.0 UG 0 0 0 wlan0 10.0.0.0 10.8.0.5 255.255.255.0 UG 0 0 0 tun0 10.8.0.1 10.8.0.5 255.255.255.255 UGH 0 0 0 tun0 10.8.0.5 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 128.0.0.0 10.8.0.5 128.0.0.0 UG 0 0 0 tun0 188.192.138.205 192.168.178.1 255.255.255.255 UGH 0 0 0 wlan0 192.168.178.0 0.0.0.0 255.255.255.0 U 9 0 0 wlan0
I am basically at my wits' end now. What can I try to bring the laptop back to connecting to the 'Net? Any diagnosis data that you need will be given with pleasure.
route -n
?