#%windir%\system32\WindowsPowerShell\v1.0\powershell.exe D:\PSScript\ERP_Production_Script\ERPRF_UpdateCheck.ps1

############脚本功能说明-2014-10-21############

#该脚本用来判断当前的DNS服务器是否可用，如果第一个DNS服务器可用，则脚本结束，否则将继续判断其他DNS服务器是否可用，最终将可用DNS服务器设置为第一个

###############################################

#####脚本开始######

#定义用于判断的域名

$dname = "www.baidu.com"

#$dname = "chkdns.idc4"

#根据是否配置网关查找使用中网卡

$index = (gwmi Win32_NetworkAdapterConfiguration |?{ $_.DefaultIPGateway -ne $null}).Index

$dnss = (gwmi Win32_NetworkAdapterConfiguration -filter "index = $index").DNSServerSearchOrder

$ConnectionID = (gwmi win32_networkadapter -filter "index = $index").NetConnectionID

#初始化用于存储DNS服务器列表的临时对象

$dnslists_new = $null

$dnslists_new = @()

#如果第一个DNS服务器可用，则脚本中断执行

$nsresult = nslookup.exe $dname $dnss[0]

If (!([string]::concat($nsresult)).contains("request timed out"))

{break}

Else {

#记录第一个不可用DNS服务器IP到临时对象

$dnslist=""|select IP,Status

$dnslist.IP = $dnss[0]

$dnslist.Status = "Error"

$dnslists_new +=$dnslist

#判断剩余的DNS服务器IP是否可用，并将其记录到临时对象

foreach ($dns in $dnss[1..$dnss.count])

{

If ($dns -ne $null)

{

$nsresult = nslookup.exe $dname $dns

#[string]::concat($nsresult)

If (!([string]::concat($nsresult)).contains("request timed out"))

{

$dnslist=""|select IP,Status

$dnslist.IP = $dns

$dnslist.Status = "OK"

$dnslists_new +=$dnslist

}

Else {

$dnslist=""|select IP,Status

$dnslist.IP = $dns

$dnslist.Status = "Error"

$dnslists_new +=$dnslist

}

}

}

#$dnslists_new

#判断当前系统是2003（5）,还是2008，在设置DNS服务器的时候所使用的命令不同

If ((gwmi win32_operatingsystem).version.split(".")[0] -eq 5)

{

#查找可用的DNS服务器列表

[array]$dnslists_ok = $dnslists_new |? {$_.Status -eq "OK"}

If ($dnslists_ok -ne $null)

{

$dnsserver0 = $dnslists_ok[0].IP

netsh.exe interface ip set dns "$ConnectionID" static $dnsserver0 primary

$dnslists_ok[1..$dnslists_ok.count] | % { netsh.exe interface ip add dns "$ConnectionID" $_.IP }

}

#查找不可用的DNS服务器列表

$dnslists_new |? {$_.Status -ne "OK"} | % { netsh.exe interface ip add dns "$ConnectionID" $_.IP }

}

Else

{

#查找可用的DNS服务器列表

[array]$dnslists_ok = $dnslists_new |? {$_.Status -eq "OK"}

If ($dnslists_ok -ne $null)

{

$dnsserver0 = $dnslists_ok[0].IP

netsh.exe interface ip set dnsservers "$ConnectionID" static $dnsserver0 primary validate=no

$dnslists_ok[1..$dnslists_ok.count] | % { netsh.exe interface ip add dnsservers "$ConnectionID" $_.IP validate=no }

}

#查找不可用的DNS服务器列表

$dnslists_new |? {$_.Status -ne "OK"} | % { netsh.exe interface ip add dnsservers "$ConnectionID" $_.IP validate=no }

}

}

#查看当前的DNS服务器列表

#$dnss=gwmi win32_networkadapter -filter "NetConnectionStatus = 2"|foreach {(gwmi Win32_NetworkAdapterConfiguration -filter "index = $($_.index)").DNSServerSearchOrder}

#$dnss