Internet over wireless while connected to a LAN network

karnage219 · 01-10-2014, 09:17 PM

Linux Newbie here, this is most likely a simple fix by anybody with experience. I am using Ubuntu 12.10. I can provide more details if needed.

I am having some trouble connecting to the internet and my lan network at the same time. I am connected wirelessly to my internet network, I am also hard wired into a home network that is not connected to the internet. While my lan is active i cannot connect to the internet, only to my network. If i disable my wired connection my wireless connection automaticly takes priority and i can connect to the internet again. I am woundering how to route my internet trafic through my wireless connection while still being able to connect to my wired network.

Also, i am currently updating to the most recent Ubuntu

jrosco · 01-10-2014, 10:18 PM

Hi, My guess would be you have 2 default routes when both connections are enabled. To check this you should open a terminal .e.g gnome-terminal and ran sudo route -n and check if you have 2 default routes e.g.

0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 wlan0
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth0

If so you need to remove the default route from the wired interface e.g eth0 if your using a static ip. If your using dhcp on the wired interface I suggest you setup a static ip via the /etc/network/interfaces file (example below)

Code:

auto eth0
iface eth0 inet static
address 192.168.0.103
netmask 255.255.255.0
broadcast 192.168.0.255

You'll have to restart the network service after adding modifying the network file

Code:

sudo /etc/init.d/networking restart

Hope this helps.

Joel

karnage219 · 01-11-2014, 12:01 AM

I dont seem to have two defaults, wlan1 seems to just be a lower priority then eth0, and I dont understand how to change that.

This is when just my wireless interface is active

Destination*****Gateway*********Genmask*********Flags*Metric*Ref****Use*Iface
0.0.0.0**********192.168.0.1******0.0.0.0***********UG*****0******0********0 wlan1
192.168.0.0****0.0.0.0************255.255.255.0****U******9******0********0 wlan1

This is while both my wireless and wired connections are active

Destination*****Gateway*********Genmask*********Flags Metric Ref****Use Iface
0.0.0.0**********172.16.42.1*****0.0.0.0*************UG****0******0********0 eth0
169.254.0.0*****0.0.0.0**********255.255.0.0********U*****1000**0********0 eth0
172.16.42.0*****0.0.0.0**********255.255.255.0*****U*****1******0********0 eth0
192.168.0.0*****0.0.0.0**********255.255.255.0*****U*****9******0********0 wlan1

jrosco · 01-11-2014, 12:31 AM

Is eth0(172.16.42 network) interface receiving its ip settings from a dhcp server? If so, try disabling the gateway from your dhcp server settings..... other then that and not knowing the complete layout of your network that's all I can think of.

Also run this :

Code:

sudo cat /etc/network/interfaces

And post the output here.

Joel

karnage219 · 01-11-2014, 01:06 AM

Quote:

Originally Posted by jrosco

Is eth0(172.16.42 network) interface receiving its ip settings from a dhcp server? If so, try disabling the gateway from your dhcp server settings..... other then that and not knowing the complete layout of your network that's all I can think of.

Also run this :

Code:

sudo cat /etc/network/interfaces

And post the output here.

Joel

Im not sure about the dhcp server, i dont belive it is.
Also, /etc/network/interface is mostly empty

Code:

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

jrosco · 01-11-2014, 01:33 AM

try adding eth0 as a static ip

following this guide:
http://www.sudo-juice.com/how-to-a-s...-ip-in-ubuntu/

and leave the gateway out, if the interface eth0 doesn't need internet access theres no need for it.

karnage219 · 01-11-2014, 02:13 AM

Ok, i set up the wired connection as a static ip but my wired is still set to default, while my wireless is not default.

jrosco · 01-11-2014, 02:59 AM

Have you done a reboot?

karnage219 · 01-11-2014, 03:09 AM

Quote:

Originally Posted by jrosco

Have you done a reboot?

Yes, also I somehow got it to work temporarily using

Code:

route add default GW 192.168.0.1 wlan1

The problem is that this is said to only hold true until a reboot. I need it to permanently stay like this.

Ifconfig still gives the eth0 a metric of 0 and wlan1 a metric of 9. Nm-tool shows eth0 as default and wlan1 as non default.

jrosco · 01-11-2014, 03:31 AM

The dirty and nasty way to permanently add that command at startup is the following

sudo echo "route add default GW 192.168.0.1 wlan1" >> /etc/rc.local

then

Code:

cat /etc/rc.local

and ensure that command is on the last line. Now reboot and see if that helps.

I'm not sure why the default gateway keeps appearing on the eth0.