On Wed, Oct 07, 1998 at 08:34:11PM -0700, [EMAIL PROTECTED] wrote:
> I was hoping for something cheaper... something that watched and noted,
> rang bells on the machine itself.
Well, there are a couple of alternatives -- both of which I've used,
and both of which have their plusses and minuses.
The TIS firewall toolkit allows you to control access to specific
ports based on IP address; it syslogs allowed (and more importantly,
failed) attempts to connect to any port that it's listening on.
I've used this on many occasions when I've needed to allow some
access to particular services but only from specific machines/networks.
(I've also used it when I wanted to allow *no* access but was curious
to see who might try.)
Another tool is the tcp-wrappers package, which operates at a slightly
deeper level and is accordingly more powerful, but which requires a bit
more tinkering with the OS's setup. What it gives you in return is
very fine-grained control and monitoring over whose packets you'll
accept and who you won't.
Both are free and run a variety of Unix/Linux platforms, but I don't
know if they run on anything else.
---Rsk
Rich Kulawiec
[EMAIL PROTECTED]
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