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POSend file to user behind a NAT router
 

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    <p>I need to send a file to a user behind a router. I know I can do this with a tcp connection if he enables port forwarding on his router. I want to avoid this in order to make my application easier to use for my users. So I been trying to do tcp punch holing and that is almost impossible. I managed to do udp puch holing. </p> <p>if you already know what udp punch holing is, then you may skip this part:</p> <p>so what I did in order to establish a connection between two users that happen to be behind a router was. user 1 talks to a server that has a WAN ip address via the udp protocol. user 2 also does the same thing. ok so now the server knows the remote end point of each user. the server now sends user 2 the info of user 1. server notifies user 1 that user 2 has received the info. user 2 then sends packages to the router ip address of user 1. the packages received by that router get forwarded to user 1 because they come from the port specified by the server. so know all the packages that user 2 sends to the router of user 1 will get to user 1 if they are sent through the port that was specified by the server. when the packages arrive to user 1 those packages arrive with user 2 info. user 1 now know how to send data two user 2 as well. </p> <p>So now I am able to send data between two users that happen to be behind distinct routers. The reason why I used the udp protocol was because it is similar to tcp when using c#. I been trying to do this with tcp but I just cannot make it work. this application that I am crating is written in c# and everything works great when users happen to be behind the same router. but know I want to extend the functionality. </p> <p>So now I finally got my first step on connecting two clients behind a different nat. the only problem is that the only way I managed to do this was with the upd protocol. I been reading that upd does not ensure the delivery of data and also that data may be received on a different order. </p> <h2>Maybe I can create an algorithm in order to be able to send data via udp knowing that data will not be lost.</h2> <p>another alternative is to use a different protocol such as ftp, bittorrent... etc. I don't know if it will be possible to do ftp punch holing though. </p> <p>so in short I just want to be able to enable two peers that are behind distinct routers to be able to communicate with the help of a server. I do not want to communicate through ralying (connection goes from client A to server to client B) because sometimes it get's difficult to manage and it is expensive to maintain when a lot of users use it. Maybe I should use a different protocol such as a bittorrent library and I haven't done that because I haven't find a good example on the internet that shows you how to use that library. </p> <hr>
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    1. COMaybe, *hole punching*?
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    2. COyeah udp I managed to do but tcp I been working on it for days. I actually posted a question on how to do tcp punch holing in here: http://stackoverflow.com/questions/7225150/forward-traffic-from-port-x-to-computer-b-with-c-udp-punch-hole-into-firewall
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