Script to grab a NIC IP information, then create a secondary script to set the config back

get_nic_ip_info-create_set_script.ps1

### Set Common Parameters  ###
$now = Get-Date -UFormat "%Y-%m-%d_%H-%M-%S"
$extNIC = "Ethernet"
$extSM = "255.255.255.0"
$outpath = "c:\temp\"
$outscriptname = "setIP_postwork.ps1"
$outfile = $outpath + $outscriptname
$CheckFilePath = Test-Path $outfile
## Get the current IPv4 info for external NIC ##
$NetIPextnic = (Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias $extnic)
$NetIPextnicIndex = $NetIPextnic.InterfaceIndex
$ipv4_extnic = $NetIPextnic.IPAddress
## Get Subnetmask ##
$NetIPextnicPrefix = $NetIPextnic.PrefixLength
## Get the current default gateway of the external NIC  ##
$gateway_extnic = (Get-NetRoute -DestinationPrefix "0.0.0.0/0" -InterfaceIndex $NetIPextnicIndex)
$gw_extnic = $gateway_extnic.nexthop
## Get the DNS Server Addresses of the external NIC ##
$DnsPri = (Get-DnsClientServerAddress -InterfaceIndex $NetIPextnicIndex -AddressFamily IPv4).ServerAddresses[0]
$DnsSec = (Get-DnsClientServerAddress -InterfaceIndex $NetIPextnicIndex -AddressFamily IPv4).ServerAddresses[1]
$Dns = $DnsPri + "," + $DnsSec

## Check if setIP_Postwork.ps1 exists, if so rename it ##
  If ($CheckFilePath -eq $True) {
    Rename-Item -Path $outfile -NewName ($now + $outscriptname)
}

## Create / Write Post Script  ##
Add-Content $outfile "### Set Common Parameters  ###"
Add-Content $outfile ("$" + "ExtNicAlias = ""$extNIC""")
Add-Content $outfile ("$" + "ExtNicIndex = ""$NetIPextnicIndex""")
Add-Content $outfile ("$" + "ExtNic_IPv4 = ""$ipv4_extnic""")
Add-Content $outfile ("$" + "ExtNic_mask = ""$NetIPextnicPrefix""")
Add-Content $outfile ("$" + "ExtNic_gw = ""$gw_extnic""")
Add-Content $outfile ("$" + "ExtNic_dns = ""$Dns""")
Add-Content $outfile "### Set IP address on External NIC  ###"
Add-Content $outfile ("New-NetIPAddress -InterfaceIndex " + "$" + "ExtNicIndex" + " -IPAddress " + "$" + "ExtNic_IPv4" + " -AddressFamily IPv4 -DefaultGateway " + "$" + "ExtNic_gw" + " -PrefixLength " + "$" + "ExtNic_mask")
Add-Content $outfile "### Set DNS Server Address on External NIC  ###"
Add-Content $outfile ("Set-DnsClientServerAddress -InterfaceIndex " + "$" + "ExtNicIndex -ServerAddresses " + "$" + "ExtNic_dns")
Add-Content $outfile "### Disable IPv6 on External NIC  ###"
Add-Content $outfile ("Disable-NetAdapterBinding –InterfaceAlias " + "$" + "ExtNicAlias –ComponentID ms_tcpip6")