在思科路由器管理界面，进入“网络参数”或“WAN口设置”，手动输入首选
# 调用联网搜索工具获取cisco路由器更改dns相关的内容
import requests
def fetch_content():
url = 'https://www.baidu.com/s?wd=cisco路由器更改dns'
response = requests.get(url, headers={'UserAgent': 'Mozilla/5.0'})
return response.text
content = fetch_content()