Date: Thu, 4 Oct 2001 13:56:26 -0700 From: "Crist J. Clark" <cristjc@earthlink.net> To: Bill Moran <wmoran@iowna.com> Cc: "Robin P. Blanchard" <Robin_Blanchard@gactr.uga.edu>, stable@FreeBSD.ORG, questions@FreeBSD.ORG Subject: Re: ipfilter/ipnat question Message-ID: <20011004135626.F297@blossom.cjclark.org> In-Reply-To: <01100408440601.01917@proxy.the-i-pa.com>; from wmoran@iowna.com on Thu, Oct 04, 2001 at 08:44:06AM -0400 References: <3BBC56A5.CA8F47E4@gactr.uga.edu> <01100408440601.01917@proxy.the-i-pa.com>
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On Thu, Oct 04, 2001 at 08:44:06AM -0400, Bill Moran wrote:
> [This belongs on -questions, I've cced]
>
> On Thursday 04 October 2001 08:31, Robin P. Blanchard wrote:
> > every now and then in my ipflog i see that ipfilter has blocked packets
> > from the internet destined for machines on my internal network:
> >
> > 01/10/2001 19:30:54.722906 3x dc0 @0:23 b 207.68.131.21,80 ->
> > 192.168.0.126,1045 PR tcp len 20 1500 -A IN
> > 01/10/2001 19:40:50.351123 dc0 @0:23 b 207.46.106.81,80 ->
> > 192.168.0.126,1033 PR tcp len 20 1500 -A IN
> > 02/10/2001 17:43:47.320547 50x dc0 @0:23 b 128.192.37.79,20 ->
> > 192.168.0.126,1148 PR tcp len 20 1500 -A IN
> >
> >
> > my question is: how is it that my internal IPs are getting to these
> > hosts in the first place? shouldn't ipnat have taken care of that on the
> > way out?
>
> They probably aren't. Do a traceroute to some well-known sites (such
> as yahoo). Chances are that your ISP is using RFC-1918 addys on
> their internal routing. Stupid idea, but it's become commonplace to do
> it.
> IPv6 needs to come into use soon. This internet thing is such a mess
> that it amazes me that it works at all!
It is much more likely that these are part of a messed up HTTP
connection. 192.168.0.126 is a valid address on your network that
might be browsing the web? The packets are being processed by ipnat(8)
as part of a valid connection but then being blocked at rule 26.
--
Crist J. Clark cjclark@alum.mit.edu
cjclark@jhu.edu
cjc@freebsd.org
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