Re: Ethernet Port Speed

[Kevin Cullimore <kcullimo () runbox com>]

On 9/9/2012 3:18 PM, Guy Harris wrote:
> On Sep 8, 2012, at 10:53 AM, Ed Stuart <fcache () gmail com> wrote:
>
> > I'm a newbie and I need to know if I can determine port speed settings of an ethernet port.
As packet transmission does not generally succeed unless both 
transmitting & receiving interfaces share an operational mode, the  
transmission of candidate details across the wire/medium occurs before 
any data that a driver should interpret as packets is sent. I'm not 
aware of any standardized provisions for including the outcome of 
Physical Layer link signaling/autonegotiation within packet data, so 
wireshark & related packet capturing tools may well be expected to fall 
short when attempting such a determination.
> <snip>
>
> In Windows XP, the Network Connections item in the Control Panel lets you see the properties of a "network connection"; these include the speed of the Ethernet port 
> (at least on my virtual machine).  The ipconfig command, at least when run with /all, didn't report anything, but I guess that's not part of the IP configuration; I 
> don't know if there's a command that will report it.  Windows 7 is similar, except that it's "Network and Sharing Center" rather than "Network 
> Connections" in Control Panel.
Successful efforts I've encountered that worked/work within modern 
Microsoft operating system environments generally incorporated scripted 
queries to the registry or the WMI repository.
The newer the NIC in question is, the greater the promise of success 
associated with recent bits of operational prestidigitation such as 
newer powershell Network Adapter Cmdlets such as 
Get-NetAdapterAdvancedProperty. Otherwise, this exercise remains every 
bit as neat, tidy and straightforward as one might expect when trapped 
within a Windows regime.
>

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