How to broadcast Video using UDPCLient Class in C# over internet? - c#-4.0

Question

I am trying to develop a Video Client/functionality that captures video using webcam and transfers to other servent (server-client) somewhere on the internet. I am using UDPCLient Class to do that.
I want my application to be able to listen and tarnsmit video captured from webcam. The capturing, transmission and receiving works fine when i do that on local network.
But when i test the application from behind router (across two differnt networks/internet) after forwarding respective ports, the internet connectivity is lost on both routers (They hang up or something) and i need to restart the routers or switch to an alternate connection. The configuration is as follows:
Servent 1 <--> Router1 <--> Internet Connection#01
Servent 02 <---> Router2 <---> Internet Connection#02
Both connections are on separate DSL Line. One of the routers is ZTE brand and the other is of Netgear.
Code for listenning/transmission is as follows:
private void StartSockets()
{
//For testing across internet i use IPAddress obtained via different function
var IPAddress = getMyIpAddress();
this.udpSender = new UdpClient(IpAddress, 4000);
this.udpListener = new UdpClient(4000);
}
private IPAddress getMyIpAddress()
{
IPAddress localIP ;//= AddressAr[0];
localIP = IPAddress.Parse(GetPublicIP());
return localIP;
}
public string GetPublicIP()
{
String direction = "";
WebRequest request = WebRequest.Create("http://checkip.dyndns.org/");
using (WebResponse response = request.GetResponse())
{
using (StreamReader stream = new StreamReader(response.GetResponseStream()))
{
direction = stream.ReadToEnd();
}
}
//Search for the ip in the html
int first = direction.IndexOf("Address: ") + 9;
int last = direction.LastIndexOf("</body>");
direction = direction.Substring(first, last - first);
return direction;
}
Code for receiving response is as follows:
private void ReceiveData()
{
//For testing across internet i use IPAddress obtained via different function
var IPAddress = getMyIpAddress();
IPEndPoint ep = new IPEndPoint(IPAddress, myPort);
try
{
byte[] receiveBytes = this.udpListener.Receive(ref ep);
this.OnReadImage(new ImageEventArgs(this.ByteToImage(receiveBytes)));
}
catch (Exception)
{
}
}
If i test on local network , i use DNSHostname to get ip address (private ip addresses) and video works fine on local network. That does not work over internet so i switch to live Ip Address and thus i use the method of getPublicIpAddress().
I know there is something seriously wrong with my approach? What would be right approach?
Should i switch to TCP Listenner? I intend to have multiple receiver of same video in future. So would that affect?
Can UDP clients cause routers to crash, hang up and restart? How can i avoid that?
Lastly, if were to avoid port-forwarding what would be the best strategy?
Please help.
Thanks
Steve