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Bash script to domain lookup and change ACL

Posted on 2014-09-20
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Last Modified: 2014-11-21
Hi,

I need to write a bash script to lookup a DNS name, let's say domain.dyndns.org, then compare it to a value in a file, if different update the file, then execute another script to ssh into a router and update an acl.

The purpose of this is to overcome a dynamic ip issue. I would want to run the script every 2 min or so.

Thanks
Mark
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Question by:mark_06
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6 Comments
 
LVL 11

Expert Comment

by:Paul S
ID: 40334990
have you tried a google search yet?

Here is what I found on google:

name lookup part:

do nslookup www.domain.com | grep Name | awk '{print $2}'; nslookup www.domain.com | grep Add | grep -v '#' | awk '{print $2}'; done

ssh part:
How to ssh from within a bash script? - Stack Overflow
http://stackoverflow.com/questions/1895185/how-to-ssh-from-within-a-bash-script

you'll have to modify as needed. we don't know how to modify your ACL since you have no info about it.
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LVL 62

Expert Comment

by:gheist
ID: 40335032
Why dont you plug it locally on router which in turn knows immediately when DHCP IP changed.
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Author Comment

by:mark_06
ID: 40335135
What I am looking to do is export the IP address value into a file or database which it will then compare to the record. If it is the same IP as in the record, it will end. If the IP changed then it will execute another script.

I can't do it locally on the router as the Cisco IOS for a 2800 will not do it.
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LVL 62

Expert Comment

by:gheist
ID: 40335136
Sounds absurd. How would you handle geographically distributed server pools?
Well 2 servers...
And you do dynamic DNS registration, but cannot send SNMP trap.
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Author Comment

by:mark_06
ID: 40335168
I know it is absurd and very strange, however I do not need to worry about geographically distributed servers as the purpose is to allow 2 remote DSL connections with Dynamic IP's access to the corporate network (they don't want VPN) for VoIP. It's a crazy idea, however its more of a Proof of Concept rather than something that will be implemented on a wide scale.
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gheist earned 500 total points
ID: 40335178
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