I updated the script a bit, this one will now find active adapters and return the information for all of them. When a adapter has no gateway (VMware adapters for instance in my situation), it will not query for the external IP.

Function Get-MyIP2
{
$externalIP = “”
$activeAdapters = Get-WmiObject Win32_NetworkAdapter -Filter ‘NetConnectionStatus=2′
Foreach ($NWadapter in $activeadapters)
{
$Adapter = get-wmiobject win32_networkadapterconfiguration | where {$_.Description -eq $NWadapter.Name}
if ($Adapter.DefaultIPGateway -ne $null)
{
$SourcePage = “http://automation.whatismyip.com/n09230945.asp”
$WebClient = new-object System.Net.WebClient
$ExternalIP = $WebClient.downloadString($SourcePage)
}
New-Object -TypeName PSObject -Property @{
IPV4=$Adapter.IPAddress[0]
IPV6=$Adapter.IPAddress[1]
Gateway=[string]$Adapter.DefaultIpGateway
ExternalIP=$ExternalIP
Computername=$Adapter.__SERVER
}
}
}