About TTL
Sumit Mehrotra
sumit at cs.bu.edu
Fri Feb 9 09:09:34 UTC 2001
Hello BIND-users
I am running an authoritative NS for coptic.net domain. The NS is 128.197.14.80.When I dig at 128.197.14.80 for www.coptic.net I get a reply with TTL of 60 sec, which is what I have set up in the db files.
However, when I dig for www.coptic.net, the default NS (128.197.12.2) of a linux box that I work on, I get the TTL as greater that 60sec ( something to the order of 86400 sec).
I was wondering how this could happed, if 128.197.12.2 cached an answer from 128.197.14.80 for www.coptic.net, it should have cached the TTL as 60 sec?
128.197.12.2 is using BIND 9.1.0
128.197.14.80 is using BIND 8.2.2 P7 if this is any help.
Attached are the db files and dig results
Thanks
- Sumit
================================
db.coptic.net
-------------
$TTL 60
coptic.net. IN SOA dhruv.coptic.net. hostmaster.dhruv.coptic.net. (
2000012100
10800
3600
604800
3600
)
IN NS dhruv.coptic.net.
IN MX 10 mail.coptic.net.
coptic.net. IN A 128.197.10.20
mail.coptic.net. IN A 128.197.10.20
dhruv.coptic.net. IN A 128.197.14.80
www IN CNAME coptic.net.
------------------------
% dig @128.197.12.2 www.coptic.net
; <<>> DiG 9.1.0 <<>> @128.197.12.2 www.coptic.net
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6837
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3
;; QUESTION SECTION:
;www.coptic.net. IN A
;; ANSWER SECTION:
www.coptic.net. 80886 IN A 128.197.10.20
;; AUTHORITY SECTION:
coptic.NET. 167286 IN NS ATLNS01.WEBHOSTING.INTERLIANT.COM.
coptic.NET. 167286 IN NS ATLNS02.WEBHOSTING.INTERLIANT.COM.
coptic.NET. 167286 IN NS DHRUV.coptic.NET.
;; ADDITIONAL SECTION:
ATLNS01.WEBHOSTING.INTERLIANT.COM. 71988 IN A 209.196.32.34
ATLNS02.WEBHOSTING.INTERLIANT.COM. 71988 IN A 209.196.32.38
DHRUV.coptic.NET. 71988 IN A 128.197.14.80
;; Query time: 3 msec
;; SERVER: 128.197.12.2#53(128.197.12.2)
;; WHEN: Fri Feb 9 04:04:48 2001
;; MSG SIZE rcvd: 195
-------------------------
% dig @128.197.14.80 www.coptic.net
; <<>> DiG 9.1.0 <<>> @128.197.14.80 www.coptic.net
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54839
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;www.coptic.net. IN A
;; ANSWER SECTION:
www.coptic.net. 60 IN CNAME coptic.net.
coptic.net. 60 IN A 128.197.10.20
;; AUTHORITY SECTION:
coptic.net. 60 IN NS dhruv.coptic.net.
;; ADDITIONAL SECTION:
dhruv.coptic.net. 60 IN A 128.197.14.80
;; Query time: 3 msec
;; SERVER: 128.197.14.80#53(128.197.14.80)
;; WHEN: Fri Feb 9 04:05:35 2001
;; MSG SIZE rcvd: 108
More information about the bind-users
mailing list