秘密在于(好吧，其实也不是什么秘密；只是一个经验丰富的管理员了解得很清楚但却忘了告诉你的一个事实)：每一台网络设备都有两个地址。

The secret (well, not really a secret; just a fact that veteran administrators know so well, they forgot to tell you) is this: every networked device actually has two addresses.

youdao

秘密在于(好吧，其实也不是什么秘密；只是一个经验丰富的管理员了解得很清楚但却忘了告诉你的一个事实)：每一台网络设备都有两个地址。

The secret (well, not really a secret; just a fact that veteran administrators know so well, they forgot to tell you) is this: every networked device actually has two addresses.

youdao