LAN based Internet problem and th Raspberry Pi and solution

2014-07-02

LAN based internet for Raspberry pi (RPi) is not on the go, the netsat, network interfaces has to be edited, and also based on the gateway of server it has to be changed
The current case used server was TP-LINK MR3420, it is a single small board computer based 3G modem, wireless device, its gateway address is 192.168.0.254. A 3G dongle connected with device and LAN from this device connected to RPi.
The Ip address addition on SD card has to be 192.168.0.100, and it is from other LAN connection to this wireless device having a similar address and gives automatically by the wireless device.
Even with this, no internet was pinging, a possible cause would be DHCP was removed, and static gets invoked

for example, the netstat -nr will show up only the

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.0.0     *         255.255.255.0   U         0 0          0 eth0

without UG flag from, that means no gateway, no way to access the internet.

the solution is to add following entries in pi@raspberrypi ~ $ cat /etc/network/interfaces

auto lo

iface lo inet loopback
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
gateway 192.168.1.1


allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

and in

pi@raspberrypi ~ $ cat /etc/resolv.conf

DNS 218.248.240.179
nameserver 218.248.240.179

and invoke

sudo /sbin/route add -net 0.0.0.0 gw 192.168.0.254 eth0
sudo /sbin/route add -net 0.0.0.0 gw 192.168.1.1 eth0

it makes three lines in netstat table with these gateway address, after this the google was getting pinged

Reference