结论先行：默认开checksum offload可能会影响web访问异常
https://docs.microsoft.com/en-us/powershell/module/netadapter/set-netadapterchecksumoffload
5个参数就是Get-NetAdapterChecksumOffload -Name "*" 结果标题里那5个
-TcpIPv6Enabled
-UdpIPv6Enabled
-IpIPv4Enabled
-TcpIPv4Enabled
-UdpIPv4Enabled
从开启到关闭会断网三五秒，从关闭到开启也一样
开启的参数值RxTxEnabled
关闭的参数值Disabled
#关闭ChecksumOffload
Set-NetAdapterChecksumOffload -Name "*" -TcpIPv6Enabled Disabled -UdpIPv6Enabled Disabled -IpIPv4Enabled Disabled -TcpIPv4Enabled Disabled -UdpIPv4Enabled Disabled
#开启ChecksumOffload
Set-NetAdapterChecksumOffload -Name "*" -TcpIPv6Enabled RxTxEnabled -UdpIPv6Enabled RxTxEnabled -IpIPv4Enabled RxTxEnabled -TcpIPv4Enabled RxTxEnabled -UdpIPv4Enabled RxTxEnabled
配置了ipv6不通，大概率是没在控制台绑定ipv6 eip
https://cloud.tencent.com/document/product/1142/47667 官网文档最开始就有提醒
绑定ipv6 eip了，其他配置也参考官网文档配了，服务器不能访问ipv6网站或不能被客户端以ipv6地址访问，ipv4地址则正常，这种情况可以试试关闭Checksum Offload (IPv6)
默认是Enabled
网卡调参数：运行ncpa.cpl打开本地连接属性 → 配置 → 高级页签里找到TCP和UDP Checksum Offload (IPv6) → 默认的Enabled切换到Disabled
Checksum Offload项比较多，我们只关闭TCP Checksum Offload (IPv6)和UDP Checksum Offload (IPv6)
有几个相关的powershell命令
- Get-NetAdapterChecksumOffload
- Set-NetAdapterChecksumOffload
- Enable-NetAdapterChecksumOffload
- Disable-NetAdapterChecksumOffload
以上4个命令中，Get-NetAdapterChecksumOffload 之外的三个命令都是"写"命令，都有个参数-NoRestart
按这个参数的官网解释，一些高级参数需要重启生效，使用写命令后最好重启下机器
实测下来，发现不加-NoRestart会自动重启网络，加了-NoRestart不会自动重启网络，可能需要手动禁用、启用网卡或者重启机器
关闭TCP Checksum Offload (IPv6)和UDP Checksum Offload (IPv6)
不加-NoRestart
Disable-NetAdapterChecksumOffload -Name "*" -TcpIPv6 -UdpIPv6
Disable-NetAdapterChecksumOffload -Name "MyAdapter" -TcpIPv6 -UdpIPv6
加-NoRestart
Disable-NetAdapterChecksumOffload -Name "*" -TcpIPv6 -UdpIPv6 -NoRestart
Disable-NetAdapterChecksumOffload -Name "MyAdapter" -TcpIPv6 -UdpIPv6 -NoRestart
不加-NoRestart
Set-NetAdapterChecksumOffload -Name "*" -TcpIPv6Enabled Disabled -UdpIPv6Enabled Disabled
Set-NetAdapterChecksumOffload -Name "MyAdapter" -TcpIPv6Enabled Disabled -UdpIPv6Enabled Disabled
加-NoRestart
Set-NetAdapterChecksumOffload -Name "*" -TcpIPv6Enabled Disabled -UdpIPv6Enabled Disabled -NoRestart
Set-NetAdapterChecksumOffload -Name "MyAdapter" -TcpIPv6Enabled Disabled -UdpIPv6Enabled Disabled -NoRestart
开启TCP Checksum Offload (IPv6)和UDP Checksum Offload (IPv6)
不加-NoRestart
Set-NetAdapterChecksumOffload -Name "*" -TcpIPv6Enabled RxTxEnabled -UdpIPv6Enabled RxTxEnabled
Set-NetAdapterChecksumOffload -Name "MyAdapter" -TcpIPv6Enabled RxTxEnabled -UdpIPv6Enabled RxTxEnabled
加-NoRestart
Set-NetAdapterChecksumOffload -Name "*" -TcpIPv6Enabled RxTxEnabled -UdpIPv6Enabled RxTxEnabled -NoRestart
Set-NetAdapterChecksumOffload -Name "MyAdapter" -TcpIPv6Enabled RxTxEnabled -UdpIPv6Enabled RxTxEnabled -NoRestart
注意：命令里的"MyAdapter"要具体化成ncpa.cpl显示的网卡名称，比如上面实例中是"以太网"
参考
https://docs.microsoft.com/en-us/powershell/module/netadapter/disable-netadapterchecksumoffload
https://docs.microsoft.com/en-us/powershell/module/netadapter/set-netadapterchecksumoffload
