Shulou(Shulou.com)06/03 Report--

Use the bat script to test the expiration time of the DNS message.

Configuration of named.xx.zone in CentOS6.4:

$TTL=7D

3D; minimum

Test results: stop the DNS service, do not reach the set minimum period of 3 days, DNS information will be invalid.

Or after the client windows2003 is restarted, the DNS information becomes invalid.

1. Restart the DNS service

[root@dns3sv named] # service named restart

Stopping named:. [OK]

Starting named: [OK]

two。 Edit the bat script and run it

Log in to the DNS client. Edit wping2h.bat

Echo off

: while1

Date / t & time / t & ping usdb1.te-n 1 | find "usdb1" & @ ping 127.0.0.1-n 7199-w 1000 > nul

Goto while1

Parameter description:

-n 7199 units, about 2 hours to output the results.

-1000 milliseconds

3. Stop the DNS service

[root@dns3sv ~] # date; service named stop

Thu Sep 12 12:37:17 CST 2014

Stopping named:. [OK]

Results of 4.ping

The DNS information expires after 1 day, and the Windows2003 ping cannot communicate with the IP pointed to by the domain name.

E:\ > echo off

Friday 2019-09-13

12:36

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Friday 2019-09-13

14:36

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Friday 2019-09-13

16:36

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Friday 2019-09-13

18:36

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Friday 2019-09-13

20:36

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Friday 2019-09-13

22:36

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Saturday 2019-09-14

00:35

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Saturday 2019-09-14

02:35

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Saturday 2019-09-14

04:35

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Saturday 2019-09-14

06:35

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Saturday 2019-09-14

08:35

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Saturday 2019-09-14

10:35

Pinging usdb1.te [192.168.15.7] with 32 bytes of data:

Saturday 2019-09-14

12:35

Ping request could not find host usdb1.te. Please check the name and try again

.

Saturday 2019-09-14

14:35

Ping request could not find host usdb1.te. Please check the name and try again

.

[EOF]

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