Dns

[pierrefitch]

I know there is some kind of trick to change the dns in 10 to 30 minutes
allot of place say 24 to 48 hours to change the dns but i seen people do it and the dns was change so quick what is the trick to this

[basschick]

no trick. it only takes around 10 minutes to change domains from one name server to another if you use directnic as your registrar.

but keep in mind that the new location has to have set it up if you don't have a control panel.

[Xstr8guy]

Patti, I use directnic and I always had nearly immediate DNS changes. But just ask Luke about my most recent DNS problem with directnic.

I had Luke jumping through hoops trying to help me get them right after directnic inadvertantly reset them to directnic defaults. My original DNS setting wouldn't take for some reason. Finally Luke had to give me all new nameservers. It took me several days to get everything working again. What a pain in the ass!

That's another reason why I love Chili! He goes out of the way to help even when the tech issues are not his fault. Kiss, kiss Luke!

[JustBryce]

DNS is really a give / take kind of thing. You can switch your DNS at most webhosts and it will start propagating on the internet within 10 minutes, but that doesn't mean that it happens for all your surfers at exactly the same time.

You can push your DNS out in only a few minutes, but that is just you broadcasting that you have a new address on the internet... that doesn't mean that every DNS server in the world is listening or asking.

We recently switched all of our DNS and it was interesting watching the bandwidth switch from one host to the other. About 80% of our traffic switched within 10 minutes of our DNS update as our new host had a very low TTL setting. Obviously so do about 80% of webhosts. But there was still traffic at our old host for several days after the switchover. There were random ISP's around that just didn't query the DNS to find the new address for a while.

So even if you are broadcasting the new address, you have to wait for every ISP to update their DNS to. We even had one Charter Cable location in Ohio wait 24 hours to update.

Then we had a few other customers who actually had a program on their computer that cached DNS and they had to manually flush their DNS in order to find us at our new home.

So most registrars (like directnic, godaddy, moniker, etc.) all have very short time to live settings and your host probably does to... its the rest of the world that has to comply.

[Chilihost]

I had Pierre's site setup to use godaddy's Advanced DNS services but unfortunately he went ahead and changed the nameservers to (cough) national net so he will have to wait it out.

cheers,
Luke

[gaybucks_chip]

There's a fine 400+ page book called "DNS and BIND" which, contrary to first impression, is not a B&D book. The deep inner workings of DNS are actually incredibly complicated and I've met only a very, very few people that have a really deep, complete understanding of it. I'm not one of them, but I know a little.

There are several different issues, most of which have been covered by others here. The main piece is time-to-live, which is how long a DNS entry stays in a local ISP's DNS before needing to be refreshed. If you change the DNS settings, you have to wait until TTL has expired since the last time a local ISP refreshed its record. So if it's set to 30 minutes, and you change the record, and Joe's ISP just refreshed 1 minute ago, it will take 29 minutes for the change to show at Joe's ISP. An increasing number of *hosting* ISPs are setting very short TTL (10-30 minutes) but many still keep it at 24 hours and a few at 7 days.

The other problem is local ISPs who have their DNS servers set not to honor TTL and instead do refreshes at fixed intervals, often only every 24 hours. This was the case at Comcast and Pacific Bell for a long time; I think they've finally gotten a clue.

There are ways around these problems in almost all cases, and it's getting better and better, but you should still count on an hour or two for the first 50-75% of ISPs to point to your new address, then 18-48 hours before 90-95% are updated, and up to 3-5 days until 100% are updated. At least that's my experience.

[Chilihost]

I think low-level internet functionality is extremely interesting. When I did my cisco certification I found that it really helped my understanding of higher level stuff like domain names and hosting requirements. Oh man, do I ever sound like a techie geek here :juggle:

cheers,
Luke

[CJ-KJCash]

....... Oh man, do I ever sound like a techie geek here :juggle:

cheers,
Luke

Your pocket protector is showing Luke hehehehehe