Solved

Fine tune a script to insert router

Posted on 2011-02-14
7
904 Views
Last Modified: 2012-08-14
In Reference to thread, Say thanks to the person who helped me !
http://www.experts-exchange.com/Programming/Languages/Scripting/Perl/Q_26821466.html#a34894213

I noticed that :

# NET 172.21.240.0/23
Dhcp Server 1.1.1.1 add scope 172.21.240.0 255.255.254.0 "172.21.240.0-Vlan-551" ""
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 6 STRING "128.163.97.5" "128.163.1.6"
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 3 STRING "172.21.244.1"
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 51 STRING "604800"
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 44 STRING "128.163.111.170" "128.163.111.171"

Put an invalid router option  optionvalue 3 STRING "172.21.244.1"

My calculations shows the gateway/router should be 172.21.240.1

I would appreciate someones help please

while ( <> )
{
	if ( /\# NET ([0-9]+\.[0-9]+\.[0-9]+)\.([0-9]+)/ ) { $net = $1; $lastNum = $2+1;  }
	else
	{
		s/set optionvalue 3 STRING \"0.0.0.0\"/set optionvalue 3 STRING \"$net\.$lastNum\"/;
	}
	print $_;
}

Open in new window

0
Comment
Question by:richsark
  • 4
  • 3
7 Comments
 
LVL 16

Expert Comment

by:sjklein42
ID: 34894537
Strange!  Is this with a different dhcp.txt input file?  Please post the input so I can try running it here.
0
 
LVL 16

Expert Comment

by:sjklein42
ID: 34894572
When I create a small file with just this input:

# NET 172.21.240.0/23
Dhcp Server 1.1.1.1 add scope 172.21.240.0 255.255.254.0 "172.21.240.0-Vlan-551" ""
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 6 STRING "128.163.97.5" "128.163.1.6"
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 3 STRING "0.0.0.0"
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 51 STRING "604800"
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 44 STRING "128.163.111.170" "128.163.111.171"

Open in new window


it generates the correct 172.21.240.1 output.

Are you sure the optionvalue 3 line in the input file has 0.0.0.0, like this:

Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 3 STRING "0.0.0.0"

If it doesn't have 0.0.0.0, it won't match.
0
 
LVL 1

Author Comment

by:richsark
ID: 34894583
Ahh, so.... the orginal file did not have 0.0.0.0, it had

# NET ---
# NET 172.21.240.0/23
Dhcp Server 1.1.1.1 add scope 172.21.240.0 255.255.254.0 "172.21.240.0-Vlan-551" ""
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 6 STRING "128.163.97.5" "128.163.1.6"
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 3 STRING "172.21.244.1"
Dhcp Server 1.1.1.1 Scope 172.21.240.0 set optionvalue 51 STRING "604800"

So I guess, would it be hard to counter these types to insure in fact the router is set right??

Thanks
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 16

Expert Comment

by:sjklein42
ID: 34894602
To replace all the optionvalue 3 strings regardless of their IPs in the input file, use this:

while ( <> )
{
	if ( /\# NET ([0-9]+\.[0-9]+\.[0-9]+)\.([0-9]+)/ ) { $net = $1; $lastNum = $2+1;  }
	else
	{
		s/set optionvalue 3 STRING \"[0-9\.]+\"/set optionvalue 3 STRING \"$net\.$lastNum\"/;
	}
	print $_;
} 

Open in new window

0
 
LVL 1

Author Comment

by:richsark
ID: 34894619
Cool, So the above has the correct logic right? I am just worried it may set what it wants, but I believe it does check the network regardless right?
0
 
LVL 16

Accepted Solution

by:
sjklein42 earned 500 total points
ID: 34894651
To summarize the latest version of the code:

It grabs each #NET address, keeps the first 3 numbers and numerically adds "1" to the fourth number.  This is the gateway IP.

This new version of the code looks for the line containing "set optionvalue 3 STRING", whether it already has a non-zero IP or not, and substitutes the new gateway IP it computed from the #NET line.

The only difference is that the previous version of the code required the input IP to be all zeroes.  The new version doesn't care.  Nothing else changed.
0
 
LVL 1

Author Closing Comment

by:richsark
ID: 34894786
Thanks !!!

Good work
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This Windows batch file is useful for organizing image files from a digital camera or other source, but can have many other uses.  It simply renames the file(s) to match their create date.  For example, if you took a picture today at 1:40pm and the …
Checking the Alert Log in AWS RDS Oracle can be a pain through their user interface.  I made a script to download the Alert Log, look for errors, and email me the trace files.  In this article I'll describe what I did and share my script.
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question