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Date:      Sun, 01 Mar 2020 04:05:22 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 244514] "reply-to" function in pf breaks RFC 1122 section 3.3.1.1 Local/Remote Decision
Message-ID:  <bug-244514-227-mB3us0AoIw@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-244514-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-244514-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D244514

--- Comment #3 from ctminime@yahoo.com ---
(In reply to Kristof Provost from comment #2)
As far as I can tell, you are wrong about dropping packets violates RFC. I
couldn't find anything of the sorts in RFC 793 or RFC 1122. What I did find=
, is
some commentary in RFC 3360 under "The history of TCP resets". Go ahead and
read it yourself. However, if you you can find that in an RFC, I would be
interested to read it.

I can't think of a single way that making "reply-to" RFC compliant (by defa=
ult)
would break any setup. It would only fix the couple of use case that it bre=
aks.=20

It is my personal opinion that the default behavior of a function should be=
 RFC
compliant. Then it could be up to the administrator if he chooses to violate
RFC to accomplish whatever he wants.

It could be done like this: "reply-to" sends all traffic, except local subn=
et
traffic, to the gateway. (FYI, this is how pfSense behaves.) But if an
administrator wanted to, for some unfathomable reason, there could be an op=
tion
like "reply-to absolute" that would be specifically for violating RFC and s=
end
all traffic to the gateway.

Just because this is the way it has worked for a decade+, doesn't mean it is
right or should stay that way.

--=20
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