Wireless Shows Connected, But No Internet/Can't Ping Router

**Coyne Money** · September 15th, 2010

So I installed 10.4 on a new Toshiba Satellite L645D
When I connect to my wireless at home, the Network Manager shows that I am connected but I can't reach any websites via ping or firefox. I also can't ping my router. I also don't have wired access working at all.

iwconfig shows connected to correct ESSID
I can ping localhost

can't ping google:

Code:

ping: unknown host www.google.com

can't ping my router (192.168.2.1):

Code:

connect: Network is unreachable

lspci shows:

Code:

02:00.0 Network Controller: Realtek Semiconductor Co., Ltd. Device 8172 (rev 10)
08:00.0 Ethernet Controller: Atheros Communications AR8152 v1.1 Fast Ethernet (rev c1)

ip rou:

Code:

169.254.0.0/16 dev wlan0 proto kernel scope link src 169.254.8.6

cat /etc/resolv.conf

Code:

#Generated by Network Manager
nameserver 208.67.222.222
nameserver 208.67.220.220
domain Belkin
search Belkin
nameserver 192.168.2.1

The two addresses at the top of this are from me trying various things to fix this but now I can't figure out how to edit it again. It's shown as read only even if I do sudo gedit, sudo vim, sudo su gedit.

Sorry to have such a long post but I figured these were a few of the commands I've seen elsewhere so I figured I'd just post them right off the bat. Also I'm copying the output of these commands to a computer which has internet access so there is small chance of typos.

**Iowan** · September 15th, 2010

I'm more familiar with ifconfig -a - if it shows an IP address of 169.254.X.X, then avahi has stepped in to "help". DHCP seems to have failed, but avahi provided an IP address (which is somewhat useless).

**Coyne Money** · September 15th, 2010

Thanks for your response.

results of ifconfig:

Code:

wlan0:avahi Link encap:Ethernet HWaddr 70:f1:a1:e6:5b:24
    inet addr:169.254.8.6  Bcast:169.254.255.255 Mask:255.255.0.0
    UP BROADCAST MULTICAST MTU:1492 Metric:1
    Interrupt:16 Memory:f8308000-f8308100

I'm not familiar with avahi at all.

**Coyne Money** · September 16th, 2010

I installed 10.10 on my machine and still have the same problem except that now a wired connection is possible.

ifconfig wlan0

Code:

wlan0     Link encap:Ethernet  HWaddr 70:f1:a1:e6:5b:24  
          inet addr:192.168.2.4  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::72f1:a1ff:fee6:5b24/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1492  Metric:1
          RX packets:35 errors:0 dropped:0 overruns:0 frame:0
          TX packets:48 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:9656 (9.6 KB)  TX bytes:10257 (10.2 KB)
          Interrupt:16 Memory:f85d0000-f85d0100

I'm not familiar with networking at all but I think it may be a dns issue from what I've seen in various places. If anyone could offer some ideas it would be great. Also, since I have the luxury of at least a wired connection I can at least easily download packages and whatnot as well as post the entire the output of commands.

UPDATE:

If I have the internet connected via a wire, then unplug the wire and reconnect to the wireless signal, I have wireless access to the internet until reboot apparently. Again, I know little of Networking but surely this some sort of flag?

**dineshs** · September 16th, 2010

please post the results of the following commands

Code:

ping 192.168.2.1 -c3

Code:

ping 4.2.2.1 -c3

Code:

route -n

**Coyne Money** · September 16th, 2010

Code:

alex@alex:~$ ping 192.168.2.1 -c3
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.
From 192.168.2.4 icmp_seq=1 Destination Host Unreachable
From 192.168.2.4 icmp_seq=2 Destination Host Unreachable
From 192.168.2.4 icmp_seq=3 Destination Host Unreachable

--- 192.168.2.1 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2000ms
pipe 2
alex@alex:~$ ping 4.2.2.1 -c3
PING 4.2.2.1 (4.2.2.1) 56(84) bytes of data.
64 bytes from 4.2.2.1: icmp_req=1 ttl=54 time=1026 ms
64 bytes from 4.2.2.1: icmp_req=2 ttl=54 time=27.0 ms
64 bytes from 4.2.2.1: icmp_req=3 ttl=54 time=22.3 ms

--- 4.2.2.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 22.316/358.475/1026.045/472.047 ms, pipe 2
alex@alex:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
192.168.2.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
0.0.0.0         192.168.2.1     0.0.0.0         UG    0      0        0 wlan0
0.0.0.0         192.168.2.1     0.0.0.0         UG    100    0        0 eth0

**dineshs** · September 16th, 2010

pl try this
Remove ethernet cable and try whether pages are loading .If not
Right-click on the NM icon(on top right of the panel) and then click on Edit Connections.
Select the tab wireless-add-ipv4-select automatic(DHCP)addresses only-give DNS as 4.2.2.1 then apply
If this is not working pl post output of

Code:

cat /etc/network/interfaces

**Coyne Money** · September 16th, 2010

Changing the DNS to 4.2.2.1 appears to have solved the problem. Thank you very much for the help! Could you offer any insight as to what exactly was happening and why that fixed it?

**dineshs** · September 17th, 2010

This is what I have learned.
In older linux versions IP configuration was done by editing /etc/network/interfaces and DNS in /etc/resolv.conf (GUI method https://help.ubuntu.com/community/NetworkAdmin)
Latest versions use Networkmanager .The file is found in /etc/NetworkManager/system-connections forexample as Auto eth0
Since you were able to ping 4.2.2.1 (an open DNS)but not google.com a DNS issue was suspected and using an open DNS worked.You can try any DNS(open or ISP maintained or your gateway IP ie 192.168.2.1)