> For the complete documentation index, see [llms.txt](https://yeasy.gitbook.io/mininet_book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yeasy.gitbook.io/mininet_book/basic_usage/node.md). # 节点操作 如果想要对某个节点的虚拟机单独进行命令操作，也十分简单，命令格式为 `node cmd`。 例如查看交换机 s1 上的网络信息，我们只需要在执行的 ifconfig 命令前加上 s1 主机标志即可，即 `s1 ifconfig`，同样，如果我们想用 ping 3 个包的方法来测试 h2 跟 h3 之间连通情况，只需要执行 `h2 ping -c 3 h3` 即可。得到的结果为 ``` mininet> h2 ping -c 3 h3 PING 10.0.0.3 (10.0.0.3) 56(84) bytes of data. 64 bytes from 10.0.0.3: icmp_seq=1 ttl=64 time=7.19 ms 64 bytes from 10.0.0.3: icmp_seq=2 ttl=64 time=0.239 ms 64 bytes from 10.0.0.3: icmp_seq=3 ttl=64 time=0.136 ms — 10.0.0.3 ping statistics — 3 packets transmitted, 3 received, 0% packet loss, time 2006ms rtt min/avg/max/mdev = 0.136/2.523/7.194/3.303 ms ``` 在本操作执行后，可以通过 wireshark 记录查看到创建新的流表项的过程，这也是造成第一个 ping 得到的结果偏大的原因。 更简单的全网络互 ping 测试命令是 `pingall`，会自动所有主机节点逐对进行 ping 连通测试。 --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://yeasy.gitbook.io/mininet_book/basic_usage/node.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.