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Date:      Tue, 23 Jan 2007 16:37:13 -0800 (PST)
From:      Arone Silimantia <>
Subject:   ipfw pipe show .... clarification, please ...
Message-ID:  <>

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I set up a dummynet pipe with this sequence of commands:

sysctl -w net.inet.ip.fw.one_pass=0
ipfw pipe 1 config bw 16Mbit/s
ipfw add 10000 pipe 1 all from any to any

So far so good.  Works great.  However, when I look at the pipe itself, with this command:

ipfw pipe show 1

I see this:

# ipfw pipe show 1
00001:  16.000 Mbit/s    0 ms   50 sl. 1 queues (1 buckets) droptail
    mask: 0x00 0x00000000/0x0000 -> 0x00000000/0x0000
BKT Prot ___Source IP/port____ ____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp
  0 tcp  2970975653 2649647615805  2 2992 10414733

I would like to clarify a few things...

First, the ipfw pipe creation command I ran is not (as far as I can tell) TCP specific, and further, my ipfw rule says "any to any" - but when I look at the pipe, it has a protocol specified (TCP) and further, has a port number (22).  I want to throttle ALL IP traffic, not just TCP, and certainly not just port 22.

What am I doing wrong ?

Second, there are seven headings (from BKT at the left to Drp on the right) but underneath those seven headings are _9_ values.  What I really want to know is how many packets I am droppinig ... but I can't tell which of the fields are the "dropped" - I assume it is the final number .. if so, what is that measured in ?  Packets ?

Finally, why am I dropping any packets ?  My total traffic is 5-7 Mbits/s on average ... I don't see why I would be dropping any packets at all ... are they being dropped because the system can't keep up, or are they being dropped because I am hitting the throttle limit and it drops everything above that ?

Many thanks.

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