tcpdumping my NodeJS app 

To learn more about networking fundamentals check out my udemy course Fundamentals of Networking for Effective Backends Head to network.husseinnasser.com for a discount coupon

Very interesting seeing the client and the server communicate like this. The clean run was needed thanks for not skipping that

Ahh, yes, tcpdump, one of my most used tools. I would also recommend adding -s 0 -a on Linux (pretty sure it's different on Mac OS X: edit and you mentioned it later) so you can look into the packets. 6:33 actually, Mac OS X came from NeXTSTEP which used a Mach kernel, which was developed at Carnegie Mellon University. And parts from BSD. Which is the BSD where FreeBSD, NetBSD, OpenBSD are also derivatives from. My guess is TCP/IP stack came from BSD. 6:41 I understand what you are saying if it went onto the network, because tcpdump would sees the packets before the NIC adds the checksums because of TCP offloading. But loopback, no NIC involved. 7:58 even better the latency of loopback is really low. Best in the industry ! ;-) 10:14 let's be clear here, isn't it just a C-structure in memory ? No memcopy at all. 9:38 if we are getting into the tech weeds obviously, the server in userspace doesn't send the TCP packet (the kernel handles the TCP part), the server program just uses the socket API and does an accept (). 10:24 well, client... 10:44 so not really a duplicate after all ? You can could argue it's not needed I guess. 14:40 well, this is why in Unix we have Unix domain sockets and in Windows Named pipes. Even less overhead than loopback. Have a great weekend ! 🙂

Low lvl stuff 🔥🔥

Very interesting, please continue like these stuff

tcpdump is a super useful tool to troubleshoot when suspecting a network route config or firewall config. This is awesome to learn about 😁

Awesome content for a Saturday afternoon. Thanks man

Thanks for low level insight Nasser , worth sharing

i clicked subscribe button 5 times

That's good stuff right there. Thanks sir for showing us such a beautiful thing (:

I want to know more about this with more details hehe. it was interesting

I know this is a random request but please could you create a video of your most commonly used networking cli tools and commands ?

Cool, very interesting

Please analyze the Microsoft Team outage due to broken storage connection on Jul 21.

Hi Hussein, can you do a detail video about backend of telegram channel ?

tcpdump -D also shows the available interfaces

hi hussein, can you please checkout cluster module of node. I think its awesome and who's better to explain it better than you

👍👍👍👍👍👍👍👍👍

مفيد شكرا

Wireshark pcap shows more info but tcpdump very much helpful for quick analysis