Re: Bug? Sendmail Tries to do DNS lookups on ipv6 link-local addresses.
- From: "Gushi" <google@xxxxxxxxx>
- Date: 2 Dec 2005 08:43:25 -0800
Claus,
Brilliant reply as per usual, and this did speed things up a great
deal. But I think it's a cure for the symptom, and not the real
problem, which I would like to fix.
For some reason (I am not sure why), the query for any ip6.int domain
works but for any ip6.arpa domain does not -- even though, for example,
I have my DNS server configured to serve both "localhost" domains from
the same file (as is the BSD default).
Basically, the query to the local DNS server times out for any ip6.arpa
queries (and returns a FORMERR (format error) before trying the ip6.int
domain, which works (and returns either NXDOMAIN or an actual reply),
which with the number of interfaces on the box, is the real cause of
the slowdown.
Based on the way the queries look in my attached text --
res_query(\[xfe800000000000000208c7fffee68306/128].ip6.arpa, 1, 12)
versus
res_query(6.0.3.8.6.e.e.f.f.f.7.c.8.0.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.int,
1, 12)
This is why I thought it was originally a bug. As I'm not 100 percent
familiar with the format of a DNS query in a dump, I can't say for 100
percent sure.
>>From playing around with dig a bit -- I get the same reply for
dig
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.int
PTR
as I do for
dig
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa
PTR
Any thoughts?
.
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