Dummynet+Firewall+One_pass question

[Marcelo Pinheiro]

Hi,

I am very new to FreeBSD, and I have a quite simple question: How does IPFW
work when I use PIPES, divert and some other Firewall rules?
What does net.inet.ip.fw.one_pass mean? For instance, if I use a pipe before
a divert with one_pass set to 1, the packet passes through the pipe, but
does not pass through the divert and that makes total sense. However if I
set one_pass to 1 and set the pipe after the divert using the internal IP
address ( RFC 1918 ) it works.... that does not make any sense, at least to
me. :)
Here are some sample rules:

        # INTERNAL NETWORK
        ${fwcmd} pipe 1000 config bw 1024Kbit/s
        ${fwcmd} pipe 1001 config bw 1024Kbit/s

        ${fwcmd} add divert natd all from 10.0.0.0/8 to any
        ${fwcmd} add divert natd all from any to 200.x.x.x

        ${fwcmd} add pipe 1038 ip from 10.0.0.0/8 to any
        ${fwcmd} add pipe 1039 ip from any to 10.0.0.0/8

If I set the way above, it works fine, even if the one_pass is set to 1 (
one ). The divert changes the packet header to my external IP, and my real
question is: How in the world the pipe works if the header is changed to
200, instead of 10?

THIS WAY IT DOES NOT WORK WITH ONE_PASS SET TO 1, it passes through the
pipe, but does not pass through the divert:

        # INTERNAL NETWORK
        ${fwcmd} pipe 1000 config bw 1024Kbit/s
        ${fwcmd} pipe 1001 config bw 1024Kbit/s

        ${fwcmd} add pipe 1038 ip from 10.0.0.0/8 to any
        ${fwcmd} add pipe 1039 ip from any to 10.0.0.0/8

        ${fwcmd} add divert natd all from 10.0.0.0/8 to any
        ${fwcmd} add divert natd all from any to 200.x.x.x

I deeply appreciate any ideas.

Sincerely,

Marcelo Pinheiro

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