[dns-operations] All dual-stack DNS servers - any problem with it?
Ed.Lewis at neustar.biz
Wed May 16 13:25:25 UTC 2007
At 2:42 PM +0200 5/16/07, OndÞej Sur wrote:
>I heard something about bind (acting as resolver) not trying IPv4 on
>some conditions? Could be urban myth, but it's worth checking...
Not an urban myth, something that is true - for
old versions of BIND that are still out in the
wilds. There are some versions of BIND that do
give up if the AAAA does not answer but there's a
workable A. ISC has fixed this bug but they
can't recall all the servers that are out there
with the bug.
I recommend having at least one pure-IPv4 name
server in the set. At least *as long as there is
considerable brokenness* in the IPv6 routing
system. (Even if the brokenness is not local to
you, brokenness is local to someone somewhere.)
.US added a pure-IPv6 server to our set, it was
noted by IANA we were the first to do that in the
root zone. We'll see what comes of that.
Edward Lewis +1-571-434-5468
Sarcasm doesn't scale.
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