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Date:      Sun, 11 Aug 2024 14:15:49 +0000
From:      "Patrick M. Hausen" <hausen@punkt.de>
To:        void <void@f-m.fm>
Cc:        "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
Subject:   Re: drop synfin
Message-ID:  <9E74F42B-1DA9-428A-A244-CDCC7DA65020@punkt.de>
In-Reply-To: <ZrjEF9gjTdiojk60@int21h>
References:  <Zri7fNZMIwwjWQbM@int21h> <CAHu1Y71GY3_wWDCL9G-iDzhBwJPy7MEVFTZz4i0oceEnE5x%2Bdg@mail.gmail.com> <ZrjEF9gjTdiojk60@int21h>

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Hi all,

> Am 11.08.2024 um 16:00 schrieb void <void@f-m.fm>:
>=20
> Hi, thank you for your response
>=20
> On Sun, Aug 11, 2024 at 09:47:28AM -0400, Michael Sierchio wrote:
>> sysrc is for editing rc files, and that's not what you want to do.
>>=20
>> you may manually set the MIB with sysctl net.inet.tcp.drop_synfin=3D1 or=
 you
>> can put this line in /etc/sysctl.conf
>>=20
>> net.inet.tcp.drop_synfin=3D1
>=20
> Yes. The reason I'm asking is because I've found instructions
> to do one or the other. The sysctl method is what I'd prefer.

using

	sysrc tcp_drop_synfin=3DYES

configures the system to perform a

	sysctl net.inet.tcp.drop_synfin=3D1

at every boot.

Simple as that.

Placing the sysctl line into /etc/sysctl.conf will achieve the same.

I don't know why there is an "official" rc.conf valure for this
particular sysctl and not for the gaziliion of other ones available.

Probably just like:

	sysrc gateway_enable=3DYES

vs.

	sysctl net.inet.ip.forwarding=3D1

Historical reasons :-)


Kind regards,
Patrick



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