Sometimes the most elementary of questi*** yield teachable moments; read on as we delve into how a single digit change between 127.0.0.0 to 127.0.0.1 offers a chance to look at network topology.

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

問題

超級使用者閱讀器Disa對環回IP很好奇：

I know that both are loopback IPs, but they have another ip mask.

What’s the difference between them? Can they be used interchangeably?

我們能從這張桌子上挑出什麼樣的資訊？

答案

兩個超級使用者貢獻者加入進來幫助解開這個謎團。首先，Mmmc提供了以下簡明概述：

No. You cannot use them both. And they are not both loopback adresses.

127.0.0.1 is a loopback address 127.0.0.2 is a loopback address 127.0.0.3 is a loopback address and so on

127.0.0.0 is a network address. Together with mask 255.0.0.0 it gives you a hint that whole class A of addresses starting with 127.*.*.* will contain loopback addresses.

然後，YLearn提供了一般命名約定的更廣泛概述，以及如何考慮它們：

What is shown in the screenshot is a routing table from a computer. The routing table is just a “roadmap” that tells a computer/router where to go to get to other devices on the network.

In some ways this is similar to how we navigate in real life.

The first column provides the list of known destinati*** (where can I go) and the second column indicates how specific the destination (I can go to Canada or I can go to Uncle John’s house in Canada). Without getting into great detail, the “higher” the mask value, the more specific the destination. So a value of 0.0.0.0 covers going to any device and a value of 255.255.255.255 specifies an individual device.

The third column specifies where traffic should go next to get to the destination (if you are going to Canada, you need to start by getting on Main Street) and the fourth column indicates which path out of the device should be used to get to the destination (from home you may only have your driveway but from the Walmart parking lot you may have several “exits” to choose from).

Finally, the metric gives the computer a way to choose the best path if there are multiple routes to the destination (you can go out either the north or east exit from the parking lot to get to Canada, but the east one is a faster).

So to answer the original question, no you can’t use 127.0.0.0 and 127.0.0.1 interchangeably. The difference shown here is that there exists two routes – a general route to any device using 127.x.y.z and a very specific route to host 127.0.0.1 (which is in 127.0.0.0), both of which use the 127.0.0.1 interface