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Date:      Fri, 22 Oct 1999 19:47:07 -0400 (EDT)
From:      "Crist J. Clark" <cjc@cc942873-a.ewndsr1.nj.home.com>
To:        lists@rhavenn.net (Lists User)
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: IPFW is acting funny...
Message-ID:  <199910222347.TAA33834@cc942873-a.ewndsr1.nj.home.com>
In-Reply-To: <3.0.6.32.19991021215338.0091f3b0@mail.trlinks.com> from Lists User at "Oct 21, 1999 09:53:38 pm"

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Lists User wrote,
> Hello List-
> 
>    Well, more then likely I am not understanding IPFW correctly, but here
> is my problem:
> 
> 
> I have the IPFIREWALL, etc.. on in the kernel and my firewall works, but I
> am trying to keep my local
> computers and routers from filling my logs, so I put a line in before my
> last one which should deny
> certian local requests, but not log them.
> 
> 
> #Before the last line
> $ipfw add deny udp from 172.20.20.15 137 to 172.20.20.12 137     #This is a
> Win98 box to my NIX box
> $ipfw add deny udp from 172.20.20.15 138 to 172.20.20.12 138
> 
> #My last lines.
> $ipfw add deny log tcp from any to any
> $ipfw add deny log udp from any to any
> 
> 
> 
> My question/problem is that these requests still get logged and fillup my
> log file with junk. I thought 
> if a deny matched it would terminate, but it keeps going and logs the
> requests? In my log file it shows 
> up exactly like the deny requests above it.
> 
> 
> Am I missing something?

My guess is that the above is missing all of the broadcasts (address
172.20.20.255 if you are using the whole class C space) that NetBIOS
machines love to make. If you just want to lose all of the NetBIOS
from that machine, 

$ipfw add deny udp from 172.20.20.15 137-139 to 172.20.20.0/24 137-139

Would do it all in one line.
-- 
Crist J. Clark                           cjclark@home.com


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