Jos Backus wrote:
(I know, following up on myself...)

http://web.mit.edu/kerberos/www/krb5-1.6/krb5-1.6.3/doc/krb5-admin.html#Using-DNS
 says:

"The second mechanism works by looking up the information in special TXT
records in the Domain Name Service. This is currently not used by default
because security holes could result if the DNS TXT records were spoofed. If
this mechanism is enabled on the client, it will try to look up a TXT record
for the DNS name formed by putting the prefix _kerberos in front of the
hostname in question."

(Fwiw, 1.5.4 has similar verbiage.) The dns_lookup_realm libdefaults option
supposedly enables this mechanism on the client. The doc for it says:

"Indicate whether DNS TXT records should be used to determine the Kerberos
realm of a host."

However, this doesn't actually work (at least in krb5 1.6.1, and likely other
MIT versions as well), so either the docs are incorrect or there's a bug.

This behavior was most likely broken when the referrals code was added.

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