Clarification on question and the answer section uppercase lower case mis match
kob6558 at gmail.com
Tue Apr 10 16:46:16 UTC 2012
On Tue, Apr 10, 2012 at 2:56 AM, rams <bramesh80 at gmail.com> wrote:
> When i queried domain with capital letters , In answer section domain name
> is displaying small letters. Is it expected? any RFC for this?
> dig @localhost D.ashwintrail.com
> ; <<>> DiG 9.2.4 <<>> @localhost D.ashwintrail.com
> ; (1 server found)
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23469
> ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0
> ;; QUESTION SECTION:
> ;D.ashwintrail.com. IN A
> ;; ANSWER SECTION:
> d.ashwintrail.com. 86400 IN A 18.104.22.168
> ;; AUTHORITY SECTION:
> ashwintrail.com. 86400 IN NS ramesh.com.
> ashwintrail.com. 86400 IN NS ramesh1.com.
> ;; Query time: 0 msec
> ;; SERVER: #53
> ;; WHEN: Tue Apr 10 02:19:00 2012
> ;; MSG SIZE rcvd: 105
> Thanks & Regards,
Since the very first DNS RFCs, DNS is case preserving but not case
sensitive. That means that a query with differences in case will
return a match with the appropriate data, just the same as when case
matches, but will return the case of the authoritative record.
See RFC1034 3.1 for a general description or RFC1035, section 2.3.3 for detail.
R. Kevin Oberman, Network Engineer
E-mail: kob6558 at gmail.com
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