Link to home
Start Free TrialLog in
Avatar of richsark
richsarkFlag for United States of America

asked on

Fine tune a script to insert router

In Reference to thread, Say thanks to the person who helped me !
https://www.experts-exchange.com/questions/26821466/req-script-to-insert-router-in-this-file.html?anchorAnswerId=34894213#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

Avatar of sjklein42
sjklein42
Flag of United States of America image

Strange!  Is this with a different dhcp.txt input file?  Please post the input so I can try running it here.
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.
Avatar of richsark

ASKER

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
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

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?
ASKER CERTIFIED SOLUTION
Avatar of sjklein42
sjklein42
Flag of United States of America image

Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
Thanks !!!

Good work