What’s a good way in PowerShell to check for an IP address switch on a webserver?

Question 1

Problem

Our web host provider is changing the IP address of one of the servers we are on. We have been given a time frame for when the switch will take place, but no exact details. Therefore, our current poor man’s check requires a periodic page refresh on a browser to see if our website is still there.

Question

We are all programmers here and this is killing me that any manual checking is required. I would know how to do this in other languages, but want to know if there is a way to write a script in PowerShell to tackle this problem. Does anyone know how I might going about this?

Question 2

If you can alert if the page is gone or does not have an expected value, you could use a script like

$ip = 192.168.1.1
$webclient = new-object System.Net.WebClient
$regex = 'regular expression to match something on your page'
$ping = new-object System.Net.NetworkInformation.Ping


do 
{
  $result = $ping.Send($ip)
  if ($result.status -ne 'TimedOut' )
  {
    $page = $webclient.downloadstring("http://$ip")
    if (($page -notmatch $regex) -or ($page -match '404') -or ($page -eq $null))
    { break}
  }
} while ($true)

write-host "The website has moved"

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$ip = 192.168.1.1

$webclient = new-object System.Net.WebClient

$regex = 'regular expression to match something on your page'

$ping = new-object System.Net.NetworkInformation.Ping

do

{

$result = $ping.Send($ip)

if ($result.status -ne 'TimedOut' )

{

$page = $webclient.downloadstring("http://$ip")

if (($page -notmatch $regex) -or ($page -match '404') -or ($page -eq $null))

{ break}

}

} while ($true)

write-host "The website has moved"