[Pdns-users] Alphabetic Case support (?)
lvrfrc87 at gmail.com
Sat Oct 10 16:55:49 UTC 2015
Any feedback from that? By the way...Well done in Berlin!!!
2015-10-09 13:59 GMT+01:00 Federico Olivieri <lvrfrc87 at gmail.com>:
> Hi all,
> I was running a DNS test (from https://www.grc.com/dns/dns.htm) on my DNS
> server. From the result I could see the "Alphabetic Case" test. I din't
> know about this feature and I googoled. That is what the website says:
> - *Alphabetic Case:*
> The DNS system is not sensitive to alphabetic case, so the domain “
> WWW.GRC.COM” is identical to “www.grc.com”. DNS is designed to *ignore
> but preserve* the alphabetic case used in queries and replies. This
> creates an opportunity for a DNS resolver to add additional unknown bits of
> “entropy” to its queries by randomly changing the case of any alphabetic
> characters in the queried domain name. When replies are received, only the
> valid replying nameserver that received the mixed-case query could know the
> proper case for its reply. No spoofing server would know. This would give a
> clever resolver another way to reject spoofed replies. We know of no
> nameservers that are deliberately mixing case in this way, but through this
> test we are helping you to keep your eye out for any.
> I had a look to PDNS website but I didn't find any relevant information to
> understand if pdns support this feature (from the test result seems not
> Do you have extra info about that?
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