Saturday, December 18, 2021

2.5 Gbps Ethernet slowing down

 I was having issues again with the unexpected slowness of my internet access.  This time turns out due to failure in ethernet auto-negotiation.  My PC's ethernet interface is 2.5 Gbps, as well MoCA adapter that is connected to it.  It was working fine, until yesterday, where I got only 90's Mbps on SpeedTest.

There is cool PowerShell command to display the link speed: Get-NetAdapter.

We can create a DOS shell wrapper, so invoking this from a regular DOS prompt would work.

For example, I put this command in a file called "getnet.ps1".  I created another DOS script called "getnet.cmd" with the content of it just calling getps1.ps1:


In getnet.ps1:

Get-NetAdapter


In getnet.cmd:

call getnet.ps1


For example:

C:\Users\anon\bin>type getnet.cmd

call getnet.ps1


C:\Users\lshih\bin>getnet


C:\Users\lshih\bin>call getnet.ps1


Name                      InterfaceDescription                    ifIndex Status       MacAddress             LinkSpeed

----                      --------------------                    ------- ------       ----------             ---------

Bluetooth Network Conn... Bluetooth Device (Personal Area Netw...      27 Disconnected 38-FC-98-13-E9-2A         3 Mbps

2.5 GigE LAN              Realtek Gaming 2.5GbE Family Contr...#2      21 Up           04-42-1A-0C-2C-C4       2.5 Gbps

vEthernet (2.5 GigE LAN)  Hyper-V Virtual Ethernet Adapter             16 Up           00-15-5D-76-F1-69        10 Gbps

vEthernet (1 GigE LAN)    Hyper-V Virtual Ethernet Adapter #3          52 Up           00-15-5D-D2-5B-EB        10 Gbps

1 GigE LAN                Intel(R) I211 Gigabit Network Conn...#2      14 Up           04-42-1A-0C-2C-C3         1 Gbps

vEthernet (VirtualBox ... Hyper-V Virtual Ethernet Adapter #2          40 Up           00-15-5D-F1-53-24        10 Gbps

VirtualBox Host-Only N... VirtualBox Host-Only Ethernet Adapter         7 Up           0A-00-27-00-00-07         1 Gbps

vEthernet (WSL)           Hyper-V Virtual Ethernet Adapter #4          75 Up           00-15-5D-9C-4E-D0        10 Gbps


No comments:

Post a Comment