Twitter & Facebook PROBLEMS LOL

[N!ck]

Yes, they don't handle user requests, they handle ISP server requests, the ISP server then caches them and user requests are served from the ISP nameservers. If they were taken directly from the root dns servers, everyone would see updates in real time as they happened and nothing would be cached. Why do you think it takes up to 24 hours for a domain ns change to propagate on the internet?

Caching. That's why.

This is true as when (in the caching respect) you update DNS or whois records they go straight to the root servers in seconds, but of course whoever you're using for DNS is likely to have to old records cached for a while.

When you do whois lookups and that sort of thing you go straight to querying the root as far as I know.

[Mentor]

This is true as when (in the caching respect) you update DNS or whois records they go straight to the root servers in seconds, but of course whoever you're using for DNS is likely to have to old records cached for a while.

When you do whois lookups and that sort of thing you go straight to querying the root as far as I know.

Although isp's will cache domain resolutions that are accessed they still have to be able toe resolve the domain to cache it. In this sense its true that requests made from your pc never go directly to the root servers. Your isp's dns server generally just acts as a middle man to ask the root servers what dns server knows about a certain tld, then it asks that server about the domain in question and so on.
Cacheing is done all over the place, even the client pc itself will keep a short term cache of domains

http://www.bleepingcomputer.com/tuto...utorial28.html - has a nice diagram :p

[Agnostic Bear]

Although isp's will cache domain resolutions that are accessed they still have to be able toe resolve the domain to cache it. In this sense its true that requests made from your pc never go directly to the root servers. Your isp's dns server generally just acts as a middle man to ask the root servers what dns server knows about a certain tld, then it asks that server about the domain in question and so on.
Cacheing is done all over the place, even the client pc itself will keep a short term cache of domains

http://www.bleepingcomputer.com/tuto...utorial28.html - has a nice diagram :p

??? ISP nameservers cache the domain for several hours, even days in some slow cases. They don't implicitly go to the root nameservers every time you make a request.

[Mentor]

??? ISP nameservers cache the domain for several hours, even days in some slow cases. They don't implicitly go to the root nameservers every time you make a request.

If isp's requested the entire set of resolutions at a set time ever day they probably really would manage to kill a few of the root servers. Requests are made on demand, if an access hasn't been made to a site already for the isp, it'll get queried directly.

[Agnostic Bear]

If isp's requested the entire set of resolutions at a set time ever day they probably really would manage to kill a few of the root servers. Requests are made on demand, if an access hasn't been made to a site already for the isp, it'll get queried directly.

What are you on about? It goes like this:

Me: HELLO WHERE IS GOOGLE.COM
ISP: HOLD ON LET ME CHECK MY CACHE
ISP: OH MAN I HAVE NO CACHE/MY CACHE IS TOO OLD LET ME GO ASK THE D ROOT SERVER
ISP: HEY D, WHERE IS GOOGLE.COM
D: WHATS A GOOGLE.COM, LET ME GO AND ASK X ROOT SERVER
(Recursion until it's found)
D: OH HEY IT'S HERE: GOOGLE NAME SERVER URL
ISP: OK THANKS I WILL KEEP THAT IN MIND FOR OH SAY 12 HOURS
ISP: HEY GOOGLE NAME SERVER WHERE SHOULD I DIRECT THIS PERSON
GOOGLE: SEND THEM HERE: 74.125.127.100
ISP: OK THANKS I WILL REMEMBER THAT IS THAT COOL?
GOOGLE: YES SURE
ISP: HEY YOU HERE IS WHERE TO GO: 74.125.127.100
Me: OK THANKS I WILL GO THERE

hours later

Me: OH MAN I FORGOT WHERE GOOGLE.COM IS HEY ISP CAN YOU TELL ME WHERE GOOGLE.COM IS
ISP: OK HOLD ON
ISP: HEY COOL I HAVE A CACHE AND ITS FRESH SO GO HERE: 74.125.127.100
Me: OK THANKS I WILL GO THERE

hours later

Me: OH MAN I FORGOT WHERE GOOGLE.COM IS HEY ISP CAN YOU TELL ME WHERE GOOGLE.COM IS
ISP: OK HOLD ON
ISP: HEY COOL I HAVE A CACHE BUT I THINK I SHOULD CHECK WITH THEM TO MAKE SURE ITS COOL
ISP: HEY GOOGLE NAME SERVERS WHERE SHOULD I SEND THIS PERSON
GOOGLE: SEND THEM HERE: 74.125.127.100
ISP: OK COOL I WILL REMEMBER THAT FOR A WHILE IS THAT COOL
GOOGLE: YEAH THATS COOL
ISP: HEY YOU GO HERE 74.125.127.10
Me: OK THANKS BYE

hours later

go to start

[Mentor]

What are you on about? It goes like this:

Me: HELLO WHERE IS GOOGLE.COM
ISP: HOLD ON LET ME CHECK MY CACHE
ISP: OH MAN I HAVE NO CACHE/MY CACHE IS TOO OLD LET ME GO ASK THE D ROOT SERVER
ISP: HEY D, WHERE IS GOOGLE.COM
D: WHATS A GOOGLE.COM, LET ME GO AND ASK X ROOT SERVER
(Recursion until it's found)
D: OH HEY IT'S HERE: GOOGLE NAME SERVER URL
ISP: OK THANKS I WILL KEEP THAT IN MIND FOR OH SAY 12 HOURS
ISP: HEY GOOGLE NAME SERVER WHERE SHOULD I DIRECT THIS PERSON
GOOGLE: SEND THEM HERE: 74.125.127.100
ISP: OK THANKS I WILL REMEMBER THAT IS THAT COOL?
GOOGLE: YES SURE
ISP: HEY YOU HERE IS WHERE TO GO: 74.125.127.100
Me: OK THANKS I WILL GO THERE

hours later

Me: OH MAN I FORGOT WHERE GOOGLE.COM IS HEY ISP CAN YOU TELL ME WHERE GOOGLE.COM IS
ISP: OK HOLD ON
ISP: HEY COOL I HAVE A CACHE AND ITS FRESH SO GO HERE: 74.125.127.100
Me: OK THANKS I WILL GO THERE

hours later

Me: OH MAN I FORGOT WHERE GOOGLE.COM IS HEY ISP CAN YOU TELL ME WHERE GOOGLE.COM IS
ISP: OK HOLD ON
ISP: HEY COOL I HAVE A CACHE BUT I THINK I SHOULD CHECK WITH THEM TO MAKE SURE ITS COOL
ISP: HEY GOOGLE NAME SERVERS WHERE SHOULD I SEND THIS PERSON
GOOGLE: SEND THEM HERE: 74.125.127.100
ISP: OK COOL I WILL REMEMBER THAT FOR A WHILE IS THAT COOL
GOOGLE: YEAH THATS COOL
ISP: HEY YOU GO HERE 74.125.127.10
Me: OK THANKS BYE

hours later

go to start

I like the way you rephrased what i was saying and claimed its what you were auguring Interesting tactic i must say, but if were on the same page now, debating the point furthers kinda useless.

[Recursion]

Jew Bear you've done it again.

[WizingWiz]

LiveJornal was also attacked,

These DoS attacks are pointless, and they make no profit,

So what is the point?

To show theyre weaknesses?

Thank god no user data was lost

Wiz