[unisog] Public or Private IP addresses?
epancer at security.depaul.edu
Thu Oct 13 23:45:48 GMT 2005
Stejerean, Cosmin wrote on Thu, 2005-10-13 at 17:43:51 -0500...
> DePaul University uses public IP addresses for all of the computers on
> campus. I have heard from people at other universities that they use private
> IP address ranges internally and then map private to public IP ranges.
> I am wondering how the network is setup at other universities and what
> people on the list think about advantages and disadvantages of picking one
> over the other.
Being a DePaul Employee, I think I can comment on this.
From a security perspective, it's quite easy to be able to track
down a compromised host or find a problem specific to a certain
machine. The only time we run into problems or have difficulty
determining which MAC address to filter, which port to shut down,
etc., is when there is a shared address or port across two or more
machines. Case in point: NAT devices that students are bringing in.
Once it gets cut off, so will their PS2, Xbox, etc.
I've been on both sides of the fence, having worked in a NAT-heavy
corporate environment before coming here. In my mind (and much to
the pleasure of jtk [hi jtk!] hearing me say this), I think NAT
only makes things worse from an incident response perspective, and
security in general.
I'll let the network gurus here tell you why each machine *should*
have a unique IP address.
Eric Pancer : Computer Security Response Team : DePaul University
http://security.depaul.edu/ .:!::!:.:!:. epancer at sg.depaul.edu
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