[dns-operations] about the underline in hostname

hua peng huapeng at arcor.de
Thu May 29 08:24:32 UTC 2014

I found this is a valid RR:

_spf.yandex.ru.         2768    IN      TXT     "v=spf1
include:_spf-ipv4.yandex.ru include:_spf-ipv6.yandex.ru ~all"

But for A, CNAME, AAAA etc, the underline in hostname is invalid.
Does this make a confusion?


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