Re: dotted hostname is bad IMO
So, let me see if I have this correctly: you think that DNS architects and/or planners should constrain their choices with respect to namespace layout and/or delegation hierarchy, because of some minor performance considerations, based on your _speculations_ (without any hard evidence) about how certain cache-fetching algorithms are coded? - Kevin On 1/31/2011 10:11 PM, p...@mail.nsbeta.info wrote: given the domain name of 126.com, and given an A RR in its zone is: s1.s2.s3 IN A 11.22.33.44 OK when a dns cache query for s1.s2.s3.126.com the first time, it will follow the logic: #1, s1.s2.s3.126.com has NS RR in cache? (no) #2, s2.s3.126.com has NS RR in cache? (no) #3, s3.126.com has NS RR in cache? (no) #4, 126.com has NS RR in cache? (yes most time, since 126.com is a famous domain). #5, Goto 126.com's NS fetch the result. The process is complicated. But if the hostname is s1-s2-s3.126.com, what will the dns cache do by the first query? it will just do: #1, 126.com has NS RR in cache? (yes) #2, go there fetching the reqult. It's much simple and fast. So I dont think dotted hostname is good pratical. ___ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users ___ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: dotted hostname is bad IMO
In article mailman.1600.1296530179.555.bind-us...@lists.isc.org, p...@mail.nsbeta.info wrote: given the domain name of 126.com, and given an A RR in its zone is: s1.s2.s3 IN A 11.22.33.44 OK when a dns cache query for s1.s2.s3.126.com the first time, it will follow the logic: #1, s1.s2.s3.126.com has NS RR in cache? (no) #2, s2.s3.126.com has NS RR in cache? (no) #3, s3.126.com has NS RR in cache? (no) #4, 126.com has NS RR in cache? (yes most time, since 126.com is a famous domain). #5, Goto 126.com's NS fetch the result. The process is complicated. But if the hostname is s1-s2-s3.126.com, what will the dns cache do by the first query? it will just do: #1, 126.com has NS RR in cache? (yes) #2, go there fetching the reqult. It's much simple and fast. So I dont think dotted hostname is good pratical. I don't think it's something you need to worry about. DNS servers organize their cache data structures to make steps 1-4 easy to perform all at once. Time to pull out your copy of Knuth Sorting and Searching. -- Barry Margolin, bar...@alum.mit.edu Arlington, MA *** PLEASE don't copy me on replies, I'll read them in the group *** ___ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: dotted hostname is bad IMO
On Tue, Feb 01, 2011 at 11:11:47AM +0800, p...@mail.nsbeta.info wrote: ... So I dont think dotted hostname is good pratical. ... You need to read the whole posting. Another poster pointed out that the dot _ I S _ the DNS delimiter. -- /*\ ** ** Joe Yao j...@tux.org - Joseph S. D. Yao ** \*/ ___ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
