我有一个简单的 Dockerfile

FROM mcr.microsoft.com/windows/servercore:1803
CMD powershell "Start-Sleep -s 100000"

和 docker-compose 定义2个服务 a 和 b ：

version: "3.5"
    services:
        a:
           build: .
        b:
           build: .

 networks:
     default:
         external: true
         name: app


在 `docker-compose up --build --force-recreate` 并连接到其中一个容器后，我无法通过其服务名称解析容器：

```java
PS C:\> ping a
Ping request could not find host a. Please check the name and try again.
PS C:\> ping b
Ping request could not find host b. Please check the name and try again.
PS C:\> Resolve-DnsName a
Resolve-DnsName : a : The filename, directory name, or volume label syntax is incorrect
At line:1 char:1
+ Resolve-DnsName a
+ ~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ResourceUnavailable: (a:String) [Resolve-DnsName], Win32Exception
    + FullyQualifiedErrorId : ERROR_INVALID_NAME,Microsoft.DnsClient.Commands.ResolveDnsName

PS C:\> Resolve-DnsName b
Resolve-DnsName : b : The filename, directory name, or volume label syntax is incorrect
At line:1 char:1
+ Resolve-DnsName b
+ ~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ResourceUnavailable: (b:String) [Resolve-DnsName], Win32Exception
    + FullyQualifiedErrorId : ERROR_INVALID_NAME,Microsoft.DnsClient.Commands.ResolveDnsName

PS C:\>

但如果我从 docker-compose 删除 networks 部分服务名称解析工作正常 . 如果我在Linux上创建和使用桥接网络，一切都可以正常工作 .

这种行为是设计还是我做错了什么？

docker docker-for-windows