Diagnostic help part 2
johna at ccbill.com
Wed Oct 1 19:51:54 UTC 2014
>If you would be so kind as to run the nmap test again from your location and let >me know if you're seeing the correct - or at least *more* correct answers, I'd >appreciate it.
It looks good now.
Starting Nmap 5.51 ( http://nmap.org ) at 2014-10-01 12:47 MST
Nmap scan report for www3.greenbuilder.com (184.108.40.206)
Host is up (0.087s latency).
PORT STATE SERVICE
53/tcp open domain
53/udp open domain
>I know Bill's issue is solved, but I want to point out that anyone running DNS >would be wise to not block TCP/53. TCP service for queries is specified in the >protocol design, and not just for transfers. Failing UDP queries should result in >retries over TCP
>With response sizes growing (dnssec, ipv6), answers are more likely to be too >large for UDP.
Good advice leaving TCP/53 open as well. I haven't done much in the way of IPv6, but one thing is certain. It's coming, and DNS responses aren't going to get any smaller. It's best to be future ready.
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