network adapter Archives - Sysadmins of the North

How to detect ethernet network speed in Windows

12 May 2017
/ Code base
/ By Jan Reilink
/

Detect the ethernet network speed using PowerShell or WMI is perfect for Windows Server Core. If you ever need to lookup the speed of your ethernet network card in Windows, on the command-line, use one of the following WMIC commands on your PowerShell prompt:

Image of a phone book. Domain Name Servers (DNS) are the Internet's equivalent of a phone book

WMI/netsh to add DNS servers on network adapters

12 December 2014
/ Windows Server
/ By Jan Reilink
/ 1 COMMENT
/

How to add DNS servers – or resolvers – to a Windows Server network adapter, or interface using WMI and the netsh command. This one is quite old but may come in handy sometimes. In this example we use Google’s Public DNS server addresses and localhost to add as DNS Servers on our server.

DHCP on Windows Server 2012 using 169.254.xx.xx as server name

12 December 2014
/ Windows Server
/ By Jan Reilink
/ 8 COMMENTS
/

Problem: after installing a new Windows Server 2012 R2 machine with the DHCP role enabled, adding a DHCP server used a 169.254.x.x IP address as server name. Instead of the servers hostname…

Explicit Congestion Notification (ECN) slows down outbound connections

3 December 2014
/ Windows Server
/ By Jan Reilink
/

Windows Server 2012 is the first Windows Server version to enable Explicit Congestion Notification, or ECN, in the TCP stack. This is also known as ECN Capability. Explicit Congestion Notification is an extension to the Internet Protocol and to the Transmission Control Protocol and is defined in RFC 3168. ECN allows end-to-end notification of network congestion without dropping packets.