Mark Andrews wrote: > In message <5387e556.5070...@arcor.de>, hua peng writes: >> IIRC BIND doesn't permit an A record whose label has a underscore >> included, for example, this one: >> >> aa_bb.google.com. 300 IN A 74.125.128.106 >> >> what RFC item is it influenced by? >> Thanks. > > RFC 952, RFC 1123 and RFC 1034. Now if aa_bb.google.com is not a > host you can turn the check off but 99.9999% of the time the owner > name of a A record is being used as a hostname.
mark, it's ok, the joke's over. anyone who wants to enforce RFC 952 in their gethostbyname() libc call should feel free, but, the time to try to enforce this in any part of DNS was maybe 1995 and probably not even then. we can't righteously complain about middleboxes that think they know what UDP/53 payloads have to look like and thus prevent EDNS from being widely deployed, while at the same time saying that BIND's zone file parser knows what a host name ought to look like (even if you're right 99.9999% of the time). vixie
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