reverse tethering - offline for some applications - Android Q&A, Help & Troubleshooting

I try to get internet on my phone from my computer without installing any tools.
In short when I try a ping to youtube.com it work but the youtube application on the phone
tells me I have no connection.
My configuration looks like :
Code:
mybox -----(Ethernet)------[my computer]------(USB)-----[the phone]
and my phone is in airplane mode to prevent wifi or mobile connections.
I enabled usb tethering so I have two interface on my computer : eth0 and usb0.
Then I have done on the computer:
Code:
sudo ifconfig eth0 0.0.0.0
sudo ifconfig usb0 0.0.0.0
sudo brctl addbr br0
sudo brctl addif br0 eth0
sudo brctl addif br0 usb0
sudo ifconfig br0 up
sudo dhclient br0
and on the phone :
Code:
su
netcfg rndis0 dhcp
After that i have the following configuration :
Code:
IP of rndis0 on the phone : 192.168.1.35/24
IP of br0(eth0 + usb0) on my computer : 192.168.1.17/24
IP of the box : 192.168.1.1/24
If i try to ping the ip adress 8.8.8.8 or any other adresse, it works.
But if I try with a domain it doesn't work :
Code:
[email protected]:/ # ping google.com
ping: unknown host google.com
It look like a DNS problem but i don't understand why because rndis0 give its address from dhcp which also give dns server address.
getprop | grep dns give me
Code:
[dhcp.wlan0.dns1]: [192.168.1.1]
[dhcp.wlan0.dns2]: []
[dhcp.wlan0.dns3]: []
[dhcp.wlan0.dns4]: []
[net.change]: [net.rndis0.dns2]
[net.dns1]: [fe80::8ef8:13ff:fe02:50ea]
[net.dns2]: [192.168.1.1]
[net.rndis0.dns1]: [192.168.1.1]
[net.rndis0.dns2]: []
I know these variables are ignored.
Then I try :
Code:
ndc resolver flushnet rndis0
ndc resolver clearnetdns rndis0
ndc resolver setnetdns rndis0 "" 8.8.8.8 8.8.4.4
and ping google.com now work. I don't understand why the dhcp doens't work...if you can explain.
If I try to connect to any website from google chrome application on my smartphone, it works !
But now when I try to use Youtube application on my smartphone it tell me "No connection".
Do you know why ?