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Date:      Sun, 18 Mar 2018 03:00:50 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-ipfw@FreeBSD.org
Subject:   [Bug 226688] [ipfw] rejects adding 255.255.255.255 to a table
Message-ID:  <bug-226688-7515-BzaFIVSaXc@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-226688-7515@https.bugs.freebsd.org/bugzilla/>
References:  <bug-226688-7515@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D226688

--- Comment #4 from Rodney W. Grimes <rgrimes@FreeBSD.org> ---
255.255.255.255 is a special broadcast IP addresses used to broadcast on "t=
his
network".  That is not applicable in this case though.

BUT 255.255.255.255 should be a perfectly valid table entry for the reasons=
 the
submitter stated.  If for some odd reason someone got this IP on the wire y=
ou
would want ipfw to filter it out.

As a workaround you could use 255.255.255.254/31, this is pretty safe as:
240.0.0.0/4 is "reserved".  Which you could also use to block this, and
if your trying to block bad addresses you should block 240/4 anyway.

I am not sure how much effort it is worth trying to fix this.

And now that I see:
        ${fwcmd} table ${BAD_ADDR_TBL} add 240.0.0.0/4
is already in /etc/rc.firewall
which would include 255.255.255.255
this bug could be closed as "to hard to fix"

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