Perfect, thanks!
On Feb 13, 2008 10:14 AM, Christopher Cowart
[EMAIL PROTECTED] wrote:
On Wed, Feb 13, 2008 at 09:23:31AM -0800, patrick wrote:
Is there a way to limit the number of TCP connections from a
particular IP at a given time using ipfw? We are running Cyrus IMAP on
FreeBSD 6.2, and are sometimes subject to POP3 brute force login
attacks. I'm not sure if it's Cyrus or the SASL SQL plugin, but these
attacks grind the server to halt (the load level goes up beyond 350!).
The database against which authentication takes places is on a
separate server, so I know it's not MySQL's fault. I'd like to be able
to set a firewall rule to set a reasonable limit per IP for these
sorts of connections. I know that pf can do it, and I'm in the process
of figuring out how to migrate all of our stuff over to pf, but in the
meantime, I'd like to try to do this with ipfw.
You can use limit rules. This should do the trick:
# ipfw add allow tcp from any to me pop3s limit src-addr 5
Check the ipfw man page section on limit for more info (though it's
pretty brief).
--
Chris Cowart
Network Technical Lead
Network Infrastructure Services, RSSP-IT
UC Berkeley
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