如果您想或需要通过以太网电缆将第二台计算机直接连接到主计算机，那么查找第二台计算机的IP地址最简单的方法是什么？今天的超级用户问答帖子为沮丧的读者提供了一些有用的建议。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

照片由Keary O.（Flickr）提供。

问题

超级用户读者Melebius想知道如何找到通过以太网电缆直接连接到第一台计算机的第二台计算机的IP地址：

I have connected my primary computer to another one using a direct Ethernet cable connection. The second computer has no peripherals attached and I want to access it using RDP and SMB. The IP addresses are auto-configured, so it registers something in the range of 169.254.x.x.

I can wait until Windows recognizes the other computer or scan IP addresses, but both acti*** take a long and unpredictable amount of time. Is there a faster way to recognize the second computer at the other end of the Ethernet cable connection? I have c***idered making a broadcast “Ethernet ping” and reverse ARP, but I have been unable to find any instructi*** for this technique.

如何找到通过以太网电缆直接连接到第一台计算机的第二台计算机的IP地址？

答案

超级用户贡献者grawity为我们提供了答案：

A broadcast IP ping might work. Not all systems answer to it, but some do when in 169.254 mode. Try ping 169.254.255.255 (needs -b on Linux), or ping ff02::1 (needs ping6 on Linux).

Directly sending a name lookup (using nbtstat -a) might work (if it runs Windows and if you know the computer’s name).

The 169.254 auto-configuration involves sending some ARP probes with the host’s own address (you can see those in Wireshark).

“Ethernet ping” exists, but only works at the Ethernet level. It will not tell you anything about the IP (It is sometimes implemented in the NIC itself, but mostly not implemented at all).

“Reverse ARP” also exists, but is almost never actually implemented either. Its primary use was superseded by BOOTP and later DHCP.

有什么要补充的解释吗？在评论中发出声音。想从其他精通技术的Stack Exchange用户那里了解更多答案吗？在这里查看完整的讨论主题。