Convert hex fields from /proc/net/route to octects

def _hex_to_octets(addr):
    '''
    Convert hex fields from /proc/net/route to octects
    '''
    return '{0}:{1}:{2}:{3}'.format(
        int(addr[6:8], 16),
        int(addr[4:6], 16),
        int(addr[2:4], 16),
        int(addr[0:2], 16),
    )