I understand the theory of DNS regarding the use of UDP and TCP but am
wondering about the real-world use of TCP DNS. Are there any sites that
use TCP exclusively for legitmate requests (i.e. NOT axfr)?
I am contemplating disallowing TCP DNS at my firewall and am wondering
about what "real world" collateral damage would be caused (examples of
specific sites and software that would break please -- I have enough
theory right now).
Thanx,
b.
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