How DNS Works - Computerphile

How do websites marry up to their IP addresses? Dr Mike Pound explains the Domain Name System - DNS.


This video was filmed and edited by Sean Riley.

[justandy]

The nameserver be like: "I know a guy that knows a guy that can help you."

[Superb_virg]

Great explanation. One of the few people who explains computer concepts very simply. This is an art. Thank you very much.

[Degenerate]

03:52 Actually, it's 13 ip addresses. This is a hard limit related to the size of DNS packets. These 13 addresses used to belong to 13 servers, but this was long ago expanded by the use of anycast routing to share those ip addresses among multiple servers. A packet sent to one of those addresses get routed to a server in the closest location. These days there are over a thousand root name servers.

[marksterling]

Takes me back 25 years when setting up the first DNS server for British Steel that would resolve internet and intranet queries

[rabreu]

From the look of the thumbnail, i tought Mike would say "Dunno" and the video would end.

[Darkhalo]

This channel is singlehandedly helping me pass my Network+ exam

[rebmcr]

Every time you're troubleshooting: "It's not possible for DNS to be the cause, it's completely unrelated."
Also every time you're troubleshooting: "It was DNS."

[happinessd]

I love this man's explanations, Clean & Simple. So easy to understand and it helps me out alot!

[BrowncoatInABox]

When recommendations are faster than sub box

[Oladipupo_]

Watched this video 2 years ago, didn't get much.
After recent studying, it all makes sense. Great video, this channels is a very helpful reference for top level explanations.

[ittvblog]

I see Dr. Michael Pound, I click like.

[oliveski]

Videos with Mike are always really interesting. I really appreciate this guy!

[julie.]

I needed this video in my life for work - perfect timing! I swear Computerphile installed an agent in my brain. Every time I need to RampUp on a concept, there is new computerphile vid on it...or maybe youtube be creepin...

[Denverse]

It's so good to see you after a long time.

[supahfly_uk]

Dr Mike on the mic, check 1 - 2.
This guy is always interesting, i love his encryption videos :D

[onlydeadlock]

You should do a video on DNS records like MX, A, CNAME, TXT, etc.

[sickboy]

title: how something works.
thumbnail: who tf knows really!?

[yasyasmarangoz]

What a coincidence!
I was looking for information about DNS the whole day, I love computerphile.

[bluerizlagirl]

I used to explain it as like making a (land line) phone call to somebody in another town. You look up the town where the other person lives, dial the STD code for that place and then their number. The same code might cover several towns, just as several websites might be served from the same IP address. The name server does the same job as the code pages in the back of the phone book.

[megaxlrful]

The DNS spoofing at the end is basically how the Big Firewall of China works in part. Because DNS has usually no encryption, they don't need to guess the request ID either, since they can just inspect it.