From owner-freebsd-net@freebsd.org  Mon Sep  3 09:33:32 2018
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Subject: Re: Ipfw fwd with route(8) RTF_BLACKHOLE and fast forwarding on
 FreeBSD 11
To: Runer <run00er@gmail.com>, freebsd-net@freebsd.org,
 "Andrey V. Elsukov" <ae@FreeBSD.org>
References: <99f99bf0-59ef-11e7-d1a4-c34a40492308@gmail.com>
From: Eugene Grosbein <eugen@grosbein.net>
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Date: Mon, 3 Sep 2018 16:33:15 +0700
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03.09.2018 14:02, Runer wrote:

> *Hello Community!
> 
> A situation has arisen in which ipfw fwd stops working when
> RTF_BLACKHOLE or RTF_REJECT, ROUTE (8), is enabled on Freebsd 11 release.
> **
> 
> FreeBSD 11.2-RELEASE-p1 route add default 127.0.0.1 -blackhole –iface ipfw show00100 30 4056 fwd 10.0.0.5 ip from table(1) to not 10.0.0.0/8 in via em0 The packet counter changes, but forwarding does not work.On FreeBSD 10 everything works fine. I suppose this is due to changes to forwarding -> fast forwarding by default in FreeBSD 11 and man ROUTE (8), “BUGS - unless IP fast forwarding is enabled, in which case the meaning of the flag will always be honored.”
> I want to know if it's possible to implement the work ipfw fwd together with RTF_BLACKHOLE on FreeBSD 11 as before in FreeBSD 10? Thank you in advance!
> 
> ***

Can you fill a Problem Report using https://bugs.freebsd.org/bugzilla/enter_bug.cgi please?
And drop me PR's number in reply.