/etc/network/interfaces

auto eth0
iface eth0 inet static
        address 10.56.34.38
        netmask 255.255.254.0
        network 10.56.34.0
        broadcast 10.56.35.255
        gateway 10.56.35.254
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 10.56.34.1 10.56.34.2
        dns-search xxx.com.tw