[BBB] memo of configuring BeagleBone Black network

manually add a gateway

route add default gw 192.168.1.1 dev eth0 => add default gateway 
 

The following configuration in /etc/network/interfaces does all above:

#iface eth0 inet dhcp
iface eth0 inet static
address 192.168.1.2
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
dns-nameservers 192.168.1.1 

Finally, add nameserver in /etc/resolf.conf

echo "nameserver 192.168.1.1" > /etc/resolv.conf 

Restart network now:
/etc/init.d/networking restart =>  restart network or 

ifdown eth0; ifup eth0

toolchain for BBB is arm-linux-gnueabihf

Problem solved! 

extract and cross compiled with CC=arm-linux-gnueabihf-gcc ./configue --target=arm-linux