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Re: Slashdot: Providers Ignoring DNS TTL?
On Fri, Apr 22, 2005 at 11:55:23PM -0400, Dean Anderson wrote: > > On Wed, 20 Apr 2005, Patrick W. Gilmore wrote: > > > > > On Apr 20, 2005, at 3:29 PM, Dean Anderson wrote: > > > > >> Or don't. No one here cares if you do. Reality trumps lab tests. > > > > > > "Reality" for the last ten years has been that no one did either PPLB > > > or TCP DNS. That reality is changing. It'll probably start to change > > > faster, sooner. Then, users will start to notice the problems. > > > > People have been using TCP applications on anycast for at least a > > decade, as I mentioned before. Since DNS responses tend to be very > > short lived TCP session, it seems to me that if it works for other > > applications (e.g. HTTP), it should work for DNS. > > I don't know of any HTTP servers that do anycast. But their failure to > take account of PPLB doesn't change anything. IF they are anycasting under > false assumptions, they'll have problems, too. Remember that anycast configuration does not always require upper layer applications to specifically support "anycast featureset." It can be done in a setup similar to those currently being done with stateless/DNS, where it is dependent of how you want to route your packets to anycast listener address. Just make sure your routing between anycasting nodes and requesting node can actually deliver a clear picture, and it shouldn't be much of an issue for the majority :) -J -- James Jun Infrastructure and Technology Services TowardEX Technologies Office +1-617-459-4051 x179 | Mobile +1-978-394-2867 firstname.lastname@example.org | www.towardex.com