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Task 6Managing IP Addresses by Using DNS
About Managing IP Addresses
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Basic Dial NMS Implementation Guide
Step 2
Understand how the CGI scripts function.
There are two scripts that work together to return an NSLOOKUP list query (ls) for a specified zone in
a CGI link.
dnszone.pl
—Runs the CGI process. In the subnet column in Figure 24, the entry 172.21.10.0/24 is
an active link that calls the dnszone.pl script.
The active link is coded as:
<td><a href="/cgi-lwt/dnszone.pl?zone=10.21.172.in-addr.arpa.">172.21.10.0/24</a></td>
Once invoked, dnszone.pl calls the second script,
dnszone_dump
.
dnszone_dump—
An expect script that steps through the NSLOOKUP interactive mode and returns
the output of a “ls [ZONE]” command to the dnszone.pl script. The zone list, returned to the
requesting web-based management browser, appears:
ls 10.21.172.in-addr.arpa.
[www.the.net]
0 host = broadcast-0.the.net
1 host = unused-1.the.net
2 host = unused-2.the.net
3 host = unused-3.the.net
4 host = unused-4.the.net
5 host = doc-core-01.the.net
6 host = doc-core-02.the.net
7 host = doc-core-03.the.net
8 host = doc-ls1010-01.the.net
9 host = doc-switch-01.the.net
10 host = doc-pix-01.the.net
10.21.172.in-addr.arpa. server = onionring.the.net
11 host = doc-AS5850-01.the.net
12 host = doc-oob-03.the.net
13 host = doc-2610-01.the.net
14 host = doc-3810a-01.the.net
15 host = doc-3810d-01.the.net
16 host = doc-ubr7246-01.the.net
17 host = doc-switch-02.the.net
Step 3
Download the source code for the scripts and customize them for your environment.
Go to http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/dialnms/dnszone.txt