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On Sep 7, 2006, at 11:06 AM, Jason Johnson wrote: > > Right, but what I am saying is, the users (e.g. AOL users) are > using some ISP for internet access. When they try to hit your > page, their PC sends a DNS request to whoever it's configured for, > which will be the ISP (e.g. AOL) servers. The ISP servers will ask > the root servers, find you and give the answer, but they (or they > used to) ignore the TTL field. They just run a modified version of > BIND or whatever with the cache time hard coded to 2 days. So for > the next 2 days all users that use the effected ISP server will hit > that cache. That wouldn't mean all of AOL for example, but some > percentage. > > Now I don't know how systems that us Dynamic DNS are getting around > this, but I guess they are so it probably wont be a problem. All I > know is I changed over my domain some months back and I couldn't > get to my site for 2 days by name because of it. > > If this reminder is irrelevant for whatever reason, I apologize. I > was trained for nearly a decade to point such things out. :) No, thanks for explaining, I understand now. That seems like obnoxious behavior on the part of AOL, but it would definitely pose a problem for the strategy I proposed. Does anyone have any more data on whether this still happens and how DynDNS etc get around it (if they do)? Avi _______________________________________________ Seaside mailing list [hidden email] http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside |
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On Fri, 08 Sep 2006 18:42:09 +0200, Avi Bryant wrote:
> On Sep 7, 2006, at 11:06 AM, Jason Johnson wrote: >> >> Now I don't know how systems that us Dynamic DNS are getting around >> this, but I guess they are so it probably wont be a problem. All I >> know is I changed over my domain some months back and I couldn't get to >> my site for 2 days by name because of it. >> >> If this reminder is irrelevant for whatever reason, I apologize. I was >> trained for nearly a decade to point such things out. :) > > No, thanks for explaining, I understand now. That seems like obnoxious > behavior on the part of AOL, but it would definitely pose a problem for > the strategy I proposed. Does anyone have any more data on whether this > still happens and how DynDNS etc get around it (if they do)? IIRC even registrar's behavior can cause 2-3 days ttl, see for example - http://www.dyndns.com/support/kb/archives/glue_records.html And from own experience, when troubleshooting my client's IP / DNS / TTL / MTU problems, I know with confidence that there are IProviders who have "pass TTL of answers to customer's DNS query according to our greediest business plan" as default business rule for their non-static IP addressed customers ... /Klaus > Avi _______________________________________________ Seaside mailing list [hidden email] http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside |
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In reply to this post by Avi Bryant
Avi Bryant wrote:
> > On Sep 7, 2006, at 11:06 AM, Jason Johnson wrote: >> >> Right, but what I am saying is, the users (e.g. AOL users) are using >> some ISP for internet access. When they try to hit your page, their >> PC sends a DNS request to whoever it's configured for, which will be >> the ISP (e.g. AOL) servers. The ISP servers will ask the root >> servers, find you and give the answer, but they (or they used to) >> ignore the TTL field. They just run a modified version of BIND or >> whatever with the cache time hard coded to 2 days. So for the next 2 >> days all users that use the effected ISP server will hit that cache. >> That wouldn't mean all of AOL for example, but some percentage. >> >> Now I don't know how systems that us Dynamic DNS are getting around >> this, but I guess they are so it probably wont be a problem. All I >> know is I changed over my domain some months back and I couldn't get >> to my site for 2 days by name because of it. >> >> If this reminder is irrelevant for whatever reason, I apologize. I >> was trained for nearly a decade to point such things out. :) > > No, thanks for explaining, I understand now. That seems like > obnoxious behavior on the part of AOL, but it would definitely pose a > problem for the strategy I proposed. Does anyone have any more data > on whether this still happens and how DynDNS etc get around it (if > they do)? > > Avi > _______________________________________________ > Seaside mailing list > [hidden email] > http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside > > > --No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.405 / Virus Database: 268.12.2/441 - Release Date: 9/7/2006 > > Yea, it does seem obnoxious. But nearly all (if not all) ISP's in the US used to do this (and I would imagine still do). Earlier bandwidth was small and expensive and the ISP's wanted to eliminate any traffic they could. DNS was a low hanging fruit because most of the ISP customers will wind up going to the same sites. _______________________________________________ Seaside mailing list [hidden email] http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside |
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In reply to this post by Chris Muller
On Sep 7, 2006, at 7:23 PM, Chris Muller wrote: > S3, Turk and now EC2. What a fascinating set of distributed computing > services! Do we have a new species of computer here (low-cost virtual > computer)? What a hopeful enablement for small players! That is the idea. > Wouldn't it be neat if, like Turk, anyone could contribute their own > computer to sell their CPU cycles for a few pennies. Does annyone > know > how it works? Yes, but if I told you, I'd have to kill you. :-) > How else can Amazon quickly procure enough hardware to > meet demand fluctuations, while still keeping prices fixed and so > reasonable, I dunno? By relentlessly yelling at their developers to improve the efficiency of their code. :-) Seriously, what they are doing is renting out spare capacity in their data centers and providing a public interface into their provisioning infrastructure. Its the same stuff they use to run their own website and manage their own fleet, but demand fluctuates seasonally (you know - Christmas) and they end up with spare capacity. So they've decided to rent it. _______________________________________________ Seaside mailing list [hidden email] http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside |
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