Date: Mon, 28 May 2001 19:46:18 -0400 From: "Michael Tang Helmeste" <glassfish@glassfish.net> To: <freebsd-security@freebsd.org> Subject: RE: Kernel message Message-ID: <GLECJJEOFFBMALIKCDHIEEKGCAAA.glassfish@glassfish.net> In-Reply-To: <20010529023722.C30478@ringworld.oblivion.bg>
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If you get this a lot and it annoys you, I'd recommend something like
portsentry (I used to get portscanned a lot and I installed this).
You can get it here: www.psionic.com/abacus
It can block them via tcpwrappers, or even add a route for them using
'route' to make it so that they can't contact you anymore (by specifying the
route to their IP as through a dummy IP on your network). It also logs it in
syslog, and you can use the log reporting tool on the same page above, to
monitor for those types of things
I found it very useful. :)
-----Original Message-----
From: owner-freebsd-security@FreeBSD.ORG
[mailto:owner-freebsd-security@FreeBSD.ORG]On Behalf Of Peter Pentchev
Sent: Monday, May 28, 2001 7:37 PM
To: Retal
Cc: freebsd-security@freebsd.org
Subject: Re: Kernel message
On Tue, May 29, 2001 at 02:02:03AM +0200, Retal wrote:
> I got this message while i was changing icmpbandlim from 200 to 30:
> May 29 01:42:14 freebsd /kernel: Limiting closed port RST response from 78
to 30
> packets per second
>
> i got this message like 10000 times..
> What is that means..
Somebody was portscanning you - running a simple program that connects
to every port from 1 to, say, 32768, on your machine, to see which ports
are 'open' - what services (daemons, servers) you are running on your
machine. The kernel had to sent a lot of 'connection refused' ('closed'
port, not open) messages, and it had a max value of 30 of those per second.
It is informing you that in one given second, it was supposed to send out
78 of those, but it only sent 30.
So.. somebody was portscanning you. If you are running any programs
that have known security issues, you had better stop them. Look at
the output of sockstat -4 to see which ports you have open (if your
FreeBSD is 4.3 or later, you can use sockstat -4l to see listening
sockets only), then look at the FreeBSD website to find a list of
security advisories to see if any of the programs you are running
are vulnerable in the versions on your machine.
G'luck,
Peter
--
I am the meaning of this sentence.
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