--On Wednesday, July 16, 2014 2:26 AM +0000 lists-spamassassin
<inbound-lists-spamassas...@listmail.innovate.net> wrote:
I'm really not certain that using "time" and "nslookup" (which is a
somewhat depreciated tool at this point) gives you results that show
where the problem might be. I would suggest that for debugging/proof
of issue purposes you use "dig" (which includes the query time by
default) with options like "+trace" so that you can see what's
really going on and how long it's taking at each stage of the lookup.
You may have done this in the past, but the results output you
included in this thread didn't do much to convince me that this was
a Rackspace issue, rather than simply slow remote-end (e.g., yahoo)
dns servers.
It happens with *every* remote lookup the first time a domain is queried.
It won't occur again for that domain until the cache expires on our local
DNS. That was simply AN example of a domain I knew was likely to not be
cached, since no one uses www.alltheweb.com anymore. ;) dig also returns
NXDOMAIN on the first lookup.
Here's a totally different domain, with dig:
[quanah@mbs01 ~]$ time dig git-master.openldap.org +trace
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.6 <<>>
git-master.openldap.org +trace
;; global options: +cmd
. 339646 IN NS g.root-servers.net.
. 339646 IN NS l.root-servers.net.
. 339646 IN NS b.root-servers.net.
. 339646 IN NS a.root-servers.net.
. 339646 IN NS f.root-servers.net.
. 339646 IN NS h.root-servers.net.
. 339646 IN NS c.root-servers.net.
. 339646 IN NS i.root-servers.net.
. 339646 IN NS j.root-servers.net.
. 339646 IN NS e.root-servers.net.
. 339646 IN NS m.root-servers.net.
. 339646 IN NS k.root-servers.net.
. 339646 IN NS d.root-servers.net.
;; Received 508 bytes from 10.110.0.108#53(10.110.0.108) in 15 ms
org. 172800 IN NS a2.org.afilias-nst.info.
org. 172800 IN NS b0.org.afilias-nst.org.
org. 172800 IN NS b2.org.afilias-nst.org.
org. 172800 IN NS c0.org.afilias-nst.info.
org. 172800 IN NS a0.org.afilias-nst.info.
org. 172800 IN NS d0.org.afilias-nst.org.
;; Received 443 bytes from 192.5.5.241#53(192.5.5.241) in 15071 ms
openldap.org. 86400 IN NS ns5.he.net.
openldap.org. 86400 IN NS ns4.he.net.
openldap.org. 86400 IN NS ns1.he.net.
openldap.org. 86400 IN NS ns3.he.net.
openldap.org. 86400 IN NS ns2.he.net.
;; Received 137 bytes from 199.19.53.1#53(199.19.53.1) in 10040 ms
git-master.openldap.org. 300 IN CNAME euler.openldap.org.
euler.openldap.org. 300 IN A 23.92.27.229
;; Received 77 bytes from 216.218.130.2#53(216.218.130.2) in 10 ms
real 0m27.152s
user 0m0.009s
sys 0m0.020s
--Quanah
--
Quanah Gibson-Mount
Server Architect
Zimbra, Inc.
--------------------
Zimbra :: the leader in open source messaging and collaboration
