Hole punching not working while both peers are behind different NAt

[abunoman2003]

Hole punching for different NAT's peers not successful. I have tried windows firewall to accept incoming connections too. Any help will be appreciated.

Thanks

[RevenantX]

Hi! Can you give more information? Minimal working code and your connection scheme.

[abunoman2003]

Hi! Thanks for your reply. I am using the code as is in sample. Just separated for server and Client Side, also i converted the codes for vb.net. Please check as attached ClientSideCode.txt ServerSideCode.txt

Thanks once again!

[RevenantX]

@abunoman2003 Where you host server? Server must be hosted without NAT (or with forwarderd ports).

[abunoman2003]

its VPS, Sure, Server without NAT (Directly public IP and all incoming and outgoing ports are allowed in firewall). Also have tried with another server with port forwarded with no luck

[abunoman2003]

If both Peers are in same host, in Same LAN (Same NAT), or Any one peer is without NAT (directly used public IP, other means Internal Endpoint and External Endpoint is Same) then connection is successful between peers with the same server i used. :)

If you have chance to test in your side, would you please advice the way. Minimal code for server and client would be very helpful.

Thanks

[RevenantX]

@abunoman2003 if two peers behind symmetric NAT ( often in offices ) - hole punch will not work. Or you use simple home routers to test?

[abunoman2003]

Hi! I have tried with different routers too with no success. Thanks

[abunoman2003]

By the way i can use other P2P applications like Skype, Teamviewer, Ammyy Admin etc whose used hole punching

[RevenantX]

@abunoman2003 skype and teamviewer can work with external server ( if NAT punch fails ). But i will check this problem. (visual basic is hard to read =\ )

[timematcher]

@abunoman2003 Here are your vb code files converted to C# ClientSideCode.txt ServerSideCode.txt

I have not tested the above code. So I have no idea if it compiles or works. For @RevenantX 's review :)

[abunoman2003]

@timemacher thank you so much.

[abunoman2003]

@RevenantX Hope you are doing fine. Is there any update?

Thanks

[RevenantX]

@abunoman2003 sorry. I have no time right now (main work). I will look at weekend. Can you send logs (just console output)? From both client and server.

[abunoman2003]

@RevenantX How are you? Please find the attached project for Server and Client. Sorry for late as i was out of work. 12-06-2017_HolePunching_test.zip

[RevenantX]

@abunoman2003 Hi! Checked your code. All works ( =| ). I think you have router with symmetric NAT (or some blocking mechanism...). There can be IPv6 problem. Can you show server logs (this will be most helpful)?

[abunoman2003]

You mean debug log? Or please specify, I am sorry. By the way can give me minimal working code to communicate p2p using sever while hole punching failed. Thank you

[RevenantX]

@abunoman2003 just output from server and client. (screenshot of console window) or write logs to file.

[abunoman2003]

[@RevenantX] hope you are fine. Please find logs attached here for Server and both peer. These days i could not find environment to test. By the way can give me minimal working code to communicate p2p using sever while hole punching failed. Thank you Server Client Log.txt

[abunoman2003]

@RevenantX
How are you? Any update?

[RevenantX]

@abunoman2003 i will create test project for you to get additional info.

[abunoman2003]

@RevenantX Thank you. I am waiting for test project.

[abunoman2003]

@RevenantX How are you? I am still waiting for the Test Project. If you have time please...

[RevenantX]

@abunoman2003 only day ago i found possible place of this behavior. I will try fix) (i know its too late possibly)

[abunoman2003]

OK, thank you so much in advance

[RevenantX]

@abunoman2003 uploaded some fixes into master branch.