UDP hole punching | The Backend Engineering Show

In this episode of the backend engineering show I discuss UDP hole punching in details.
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[@hnasr]

Get my Fundamentals of Networking for Effective Backends udemy course Head to network.husseinnasser.com (link redirects to udemy with coupon)

[@lukaswerner4390]

I just re-watched this after looking at libp2p hole punching. This is a good explainer. But fun fact we can do p2p through symmetric nat because of the sync packet being set. Pretty cool stuff

[@biplobmanna]

Starting the day with some Backend Engineering is substantially motivating to get some real engineering work done.

[@HarshKapadia]

Yes!

[@snowzZzZz]

If I have a server (that is already port forwarded) and a client
Can I just add a STUN library like libnice to the server, and fetch the public ip/port from the server, then send to the server again with this info, and then they communicate?
if summerrical NAT only accepts return packets from whom it sent the first packet to, then this should solve this issue, without the need to configure an in the middle server

[@masonsafavi1886]

Huge thanks صدیقی

[@muhammadnazirinqlabimediac3546]

not entirely true tbh that "none of the packets are intended for router". Alot of control plane protocols packets are intended for router

[@sayansikdar4385]

is this a AI voice over?

[@gerooq]

video starts at 8:17 :/

[@zaheeruddinfaiz7064]

7:38 I was thinking of Pam from The Office. When she was receiving huge bouqes of flower on Valentine's Day. But none of them were for herself. She got really sad seeing that.
She kept of "routing" the boques to Phyllis :(

[@itherna]

Hi Hussein and thanks for a great video. Is there any time limit for how long each hole exists before the router closes it?

[@jolachye8450]

Hi Hussein. Once you punched a hole with UDP and start the peer-to-peer communication between two computer, is it possible to keep that connection but convert it from UDP to TCP, so that you can continue the communication with TCP (instead uf UDP) ?

[@alexanderkremenchuk8378]

great explanation

[@withdjmorris]

Dude the hole thing came in just brilliant 🤣

[@MustataAlexandruIon]

Good Video! I'm glad your name is not PAul!

[@noraalsulttan1437]

thank you, was easy to follow through :)

[@rocketleague2136]

@Hussain Nasser give us your top10 book for back end programmers!

[@zaheeruddinfaiz7064]

Hussain, what about the Virtual Server setting that is present on the routers. I think we can use that to forward the packet to the relavent machine in the private network.
While setting this, we specify the private ip address of the machine and the port of the machine where we want to route the packet to.

[@ili101]

"Virtual Servers" is a confusing synonym to "Port Forwarding", port forwarding will solve this problem but need to be configured manually on your router, a better solution is "UPnP" which is a protocol that let your PC send a request to your router to set a port forwarding rule for you automatically.

[@zaheeruddinfaiz7064]

@@ili101 That is so interesting. I will look into UPnP 🙂

[@Shuriken255]

I really like the way you explain the concepts behind the terms like this one. Very understandable and clear.

[@GmanGavin1]

Thank you thank you thank you!!! Quality content, great mic quality, clear and concise talk, not overwhelming yet very informative. Subbed!

[@Shadrak33]

great information! can you tell me why I can't get my UDP hole punching script to work inside a docker container when it works just fine outside it?

[@devyetii]

Looks like you need some coffee to fill the holes 😂

[@giovannibertoncelli6777]

Every day a router gets friendzoned

[@autohmae]

11:20 that sounds like an other backronym
13:28 it's especially problematic if both sides have port randomization.
15:43 unless you are Dan Kaminsky of course... (RIP) see: DNS Rebinding And More Packet Tricks at 24c3

[@faridrahman1731]

No practical

[@vindvind]

Poor router - maybe we can send a package to it just once? 😭📦

[@Nominal_GDP]

nice asmr

[@bossragegamer4081]

Great video and explanation of UDP hole punching.

[@riyaadhabrahams]

Why did you make me feel sad for the poor routers

[@mauroinde]

amazing, happy to follow you Mr.

[@PawitSahare]

Pls give me a example

[@anarabdullazad4649]

7:45 :) good humour.

[@increasingsun]

First 🤣

[@random4573]

Congratulation

[@mastahc0w]

10 IF "First" = 0 THEN 30 ELSE 20
20 END
30 PRINT "HI"
HI