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Date:      Tue, 12 Aug 2008 08:22:23 -0400 (EDT)
From:      Fred Portnoy <>
To:        Adrian Penisoara <>
Cc:        freebsd-ipfw <>
Subject:   Re: ipv4 diffserv entry
Message-ID:  <>
In-Reply-To: <>

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First question, ipfw on FreeBSD 5.4-RELEASE. Other questions are more difficult, since we're dealing with a production network.... 


Fred Portnoy
Network Analyst
Plymouth State University

"unfettered by edgy modernisms, or classical influences"

----- Original Message -----
From: "Adrian Penisoara" <>
To: "Fred Portnoy" <>
Cc: "freebsd-ipfw" <>
Sent: Tuesday, August 12, 2008 7:21:45 AM GMT -05:00 US/Canada Eastern
Subject: Re: ipv4 diffserv entry


On Mon, Aug 11, 2008 at 10:30 PM, Fred Portnoy
<> wrote:
> By using Sniffer and tcpdump together, it appears that the entry in the "TOS" field of the IPv4 header is getting stripped off as the packet leaves the external facing interface of the firewall. Is this known behavior? Is there a way to preserve the TOS?

 Which firewall framework are we talking about (ipfw / pf / ipf) ?
Does it reproduce with all/other firewalls ?
 If you completely disable the firewall, does the issue stop reproducing ?


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