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Memories and Wet Dreams
Hic! I'm Drunk
I Have No Life
March 22nd, 2005, 02:43 AM
Hi frpeter...interesting post and thread. It makes for good conversation...
Where are you getting your information? I'm not familiar with this being a regular practice, but consider it more of an extreme solution to a problem. Kind of like hitting a nail with a thermonuclear warhead.
1. Why then is a blanket block on unresolvable IP addresses becoming increasingly popular?
Hard to say. Some government systems may intentionally not resolve. Also, and I don't know the regulations over this, but many agencies may intentionally not reverse their IP's for the purpose of client privacy and such. Hard to say.
2. Any opinions as to why ISP and the like do not atleast use a resolvable in.arpa reverse resolution? Especially considering that large blocks can be written out with a simple bash script?
I think it comes down to this...blocking unresolvable IPs is an option. So is instituting a white-list, black-list, ACL, etc. But just because some folks consider it an acceptable solution for THEIR situation (and maybe these folks are championing their position for whatever reason) doesn't make it a panacea for YOUR situation. I would certainly consider it a valid option if you had a limited audience for the services being presented.
For example, my client has an external FTP server specifically for business partners to push and pull (encrypted) data files through. There is a short list of partners who would use this. If we began to see suspicious activity, recon or probe attempts, etc. then instituting a policy like this would probably be a good initial step. Certainly not a complete response, and you have to be mindful of clients being cut off...but its an option.
Personally, I think I have better ways to spend my time and energy actually solving the problem. My $0.02.
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