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Subject: [Bug 203715] [pf] 'dup-to' option doesn't duplicate packets
Date: Mon, 12 Oct 2015 08:55:23 +0000
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X-Bugzilla-Version: 11.0-CURRENT
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203715

            Bug ID: 203715
           Summary: [pf] 'dup-to' option doesn't duplicate packets
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: milosz.kaniewski@gmail.com

uname -a:
FreeBSD freebsd11_master.kvm 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r285616: Thu
Jul 16 02:21:59 UTC 2015    
root@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64


+----------+        +-----------+        +----------+
|          |     em0|           |em1     |          |
|  host1   +--------+  FreeBSD  +--------+  host2   |
|          |        |           |        |          |
+----------+        +-----------+        +----------+
                          |em2                      
                          |                         
                          |                         
                          v 

I have FreeBSD machine which forwards packets between host1 and host2. This
machine has also an additional interface (em2) which act as span interface -
all traffic between host1 and host2 is copied into it.
To achieve this scenario I can set bridge with em0 and em1 as members and em2
as span interface. But I would like to get same result using pf instead. So I
tried to use this rules:

pass out on em0 dup-to em2 no state
pass out on em1 dup-to em2 no state

But it doesn't work. No packets appear on interface em2. I've checked same
configuration on OpenBSD (version 5.7) and everything worked well.

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