Okay, I understand DNS less than I realized

Matariki

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Mon Feb-28-11 06:04 PM
Original message

Okay, I understand DNS less than I realized

WHY would a web address resolve for some locations and not others? That just seems odd to me. I can access DU via my phone's browser, but still nothing on the computer.

I'm a web developer, I thought I grokked this stuff... lol

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slackmaster

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Mon Feb-28-11 06:12 PM
Response to Original message

1. DNS records don't propagate immediately. Look up TTL (Time To Live) for details.

I learn more about DNS every day, and I like it less every day.

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DisgustipatedinCA

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Mon Feb-28-11 09:56 PM
Response to Reply #1

22. moreover, not all nameservers honor the ttl

so it looks like DU is set for 600 seconds, a relatively short TTL. But some nameservers won't honor the TTL and will squelch the change for 24 hours, or more likely, until some overnight batch-procssing-of-change event occurs on a nightly basis.

Yes, I've made DNS errors, and it's a horror story in slow motion, because you know it's coming--the outage, that is--and there's nothing you can do about it other than dropping the TTL as low as you can and consoling yourself that the fix will propagate to *most* nameservers in a timely fashion.

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muriel_volestrangler

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Mon Feb-28-11 06:12 PM
Response to Original message

2. Different ISPs have different name servers

The servers should all contain the same information, via updates sent between them, but something has gone wrong with the information for DU.

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kirby

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Mon Feb-28-11 06:22 PM
Response to Original message

3. Caching...

DNS resolution is decentralized. When you type an address in, your local server (perhaps your ISP), maps it to an address. The DNS mapping has an 'expiration date'. Only after that expiration date will the local server query some master server to updates its records. The expiration date may be interpreted (or ignored) differently at different servers on the internet. So not everything is uniform and the time it takes from the time someone updates the master record to when 'everyone' in the worlds local servers receive the update can take up to 3 days.

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Matariki

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Mon Feb-28-11 09:28 PM
Response to Reply #3

16. Thanks. Great explanation. n/t

I'm still not able to get on here directly btw. Using a proxie.

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RUMMYisFROSTED

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Mon Feb-28-11 06:27 PM
Response to Original message

4. k

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L. Coyote

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Mon Feb-28-11 07:08 PM
Response to Original message

5. Techies have to type in the correct number first

When you administer a domain, you have to assign the DNS an IP number, the computer number.

Democratic Underground, LLC
PO Box 42557
Washington, DC 20015
Registrar: DOTSTER
Domain Name: DEMOCRATICUNDERGROUND.COM
Created on: 05-DEC-00
Administrative, Technical Contact:
Allen, David
Democratic Underground, LLC
PO Box 42557
Washington, DC 20015
US
Domain servers in listed order:
NS1.DCA.NET

If the server at DCA.NET does not have the correct info, all fails.

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Matariki

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Mon Feb-28-11 09:29 PM
Response to Reply #5

17. That part I understand.

It's the consistency issues for people viewing the site that had me scratching my head.

Thanks for the info.

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KoKo

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Mon Feb-28-11 07:10 PM
Response to Original message

6. I don't understand it except basic "old time stuff" ...something "out of ordinary" out there?

:shrug:

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Kingofalldems

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Mon Feb-28-11 07:12 PM
Response to Original message

7. Oh, I just thought this daggone machine was acting up again

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Mnpaul

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Mon Feb-28-11 07:32 PM
Response to Original message

8. Have you tried OpenDNS?

http://www.opendns.com/

I switched to it some time ago.

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steve2470

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Mon Feb-28-11 08:20 PM
Response to Reply #8

9. it's a great service nt

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Canuckistanian

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Mon Feb-28-11 08:34 PM
Response to Reply #8

14. Would opendns have allowed access to DU today?

And is there any advantage to the free version?

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steve2470

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Mon Feb-28-11 09:41 PM
Response to Reply #14

20. I've been able to access DU all day today and I'm using the free OpenDNS nt

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Canuckistanian

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Mon Feb-28-11 09:47 PM
Response to Reply #20

21. Great, thanks for the info

I had no idea of this before.

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Zywiec

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Mon Feb-28-11 08:24 PM
Response to Original message

10. How about enter the IP address directly

http://216.158.28.198

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Duer 157099

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Mon Feb-28-11 08:30 PM
Response to Reply #10

11. Best.Answer.Yet.

Edited on Mon Feb-28-11 08:31 PM by Duer 157099

Thanks for that IP! I'll file it away for a rainy day.

edit to add: unless it changes

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MilesColtrane

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Mon Feb-28-11 08:54 PM
Response to Reply #10

15. That brings up the home page, but...

we are still unable to navigate because almost all links are still addressed as "democraticunderground.com/XXXXX".

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Matariki

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Mon Feb-28-11 09:32 PM
Response to Reply #10

18. No that doesn't work.

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joshcryer

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Mon Feb-28-11 09:33 PM
Response to Reply #10

19. you have to put that IP in your hosts file, google "hosts file *your OS*"

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KoKo

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Mon Feb-28-11 08:32 PM
Response to Original message

12. Hubby couldn't Access DU from "I-Phone" in the same time period that I couldn't get DU...

so what does that mean? :shrug:

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Boswell

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Mon Feb-28-11 08:33 PM
Response to Original message

13. anything wierd in your hosts file?

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