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.
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