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From: Tyler West <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: filter expressions not working in tcpdump and tethereal
Date: Tue, 15 Mar 2005 11:02:29 -0600
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Package: libpcap0.8

Version:  0.8.3-5

 

Something seems to be broken with libpcap under Debian Sarge.  When
capturing traffic on a particular host, if I execute my tcpdump or tethereal
without a filter expression, I can see traffic captured for host a.b.c.d.
However if I add the filter expression 'host a.b.c.d' to the end of my
tcpdump or tethereal command it doesn't appear to capture any packets.  In
doing some basic research I saw where a similar bug had occurred a couple of
years ago but I am not a programmer and simply had to stop at a point in the
research when it got over my head.  This problem also appears to affect
other filter expressions as well.  Without a filter expression I can see
obvious HTTP traffic but if I append 'port 80' it won't capture anything.

 

I am running Debian Sarge with kernel 2.6.8-1 (default install, non-custom).
I'm assuming the problem is with libpcap since it affects both tcpdump and
tethereal.  I have multiple Broadcom BCM5782 NICs using the tg3 driver.  My
shared C library is libc-2.3.2.so.

 

Thanks,

 

 

Tyler West, CCNA

Senior Network Engineer

Dollar General Corporation

 


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<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Package: libpcap0.8<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Version:&nbsp; 0.8.3-5<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Something seems to be broken with libpcap under =
Debian
Sarge.&nbsp; When capturing traffic on a particular host, if I execute =
my
tcpdump or tethereal without a filter expression, I can see traffic =
captured
for host a.b.c.d.&nbsp; However if I add the filter expression =
&#8216;host
a.b.c.d&#8217; to the end of my tcpdump or tethereal command it =
doesn&#8217;t
appear to capture any packets.&nbsp; In doing some basic research I saw =
where a
similar bug had occurred a couple of years ago but I am not a =
programmer and
simply had to stop at a point in the research when it got over my =
head.&nbsp;
This problem also appears to affect other filter expressions as =
well.&nbsp;
Without a filter expression I can see obvious HTTP traffic but if I =
append &#8216;port
80&#8217; it won&#8217;t capture anything.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I am running Debian Sarge with kernel 2.6.8-1 =
(default
install, non-custom).&nbsp; I&#8217;m assuming the problem is with =
libpcap
since it affects both tcpdump and tethereal.&nbsp; I have multiple =
Broadcom BCM5782
NICs using the tg3 driver.&nbsp; My shared C library is =
libc-2.3.2.so.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Thanks,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Tyler West, CCNA</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Senior Network Engineer</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Dollar General =
Corporation</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

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Received: (at 299642-done) by bugs.debian.org; 10 Oct 2005 18:05:42 +0000
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From: Romain Francoise <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Closing
Organization: The Debian Project
Date: Mon, 10 Oct 2005 20:05:57 +0200
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I believe this bug can now be closed.

-- 
  ,''`.
 : :' :        Romain Francoise <[EMAIL PROTECTED]>
 `. `'         http://people.debian.org/~rfrancoise/
   `-


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