Net Adapter toggling/Route Table changes

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    by OCSecurity at 2012-12-27 06:19:02

    I had a question regarding designing a script that could do the following:

    -Enable a Network Adapter (I have seen the commands for this)
    -Change the routing tables to direct external traffic across the newly enabled NIC while keeping internal traffic over the existing NIC

    I normally redo these manually via the command prompt but I was hoping there was a way to do this via a script to make life a little easier. Is a PowerShell script the best option?

    Any help you can provide would be greatly appreciated.

    by Klaas at 2012-12-27 06:34:15

    I used to do that with WMI: get-wmi -computername server1 -class win32_networkadapter and also win32_networkadapterconfiguration. The trick nowadays is to apply a filter that makes absolutely sure you select the right one, on my Win7 machine I have 19 adapters and I haven't got any virtual machines installed. When you can isolate that one adapter you can set ip, dns, wins and default gateway. This is a part of an old script (PS v1 on Windows XP):
    $obj = get-wmiobject -class Win32_NetworkAdapterConfiguration -computername $comp -ea silentlycontinue |`
    where {$_.IPAddress -match "192.168."}| where {$_.IPEnabled -and -not $_.DHCPEnabled}
    foreach ( $adapt in $obj ) {$adapt.setgateways("$GW")}
    I believe the method for changing IP is .enablestatic(). You can find that by piping to | get-member.
    routes I used to add by calling psexec (you better use invoke-command) and executing the route command on the target server.

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