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Sat, 6 May 2023 18:01:22 -0400 (EDT) Message-ID: <0bee752e-0e01-1e51-e411-2995a3d6a318@aetern.org> Date: Sun, 7 May 2023 00:01:21 +0200 List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.1 Subject: Re: blackhole defaults Content-Language: en-US To: FreeBSD Mailing List References: <080af465-82c9-6347-473d-0235d6982278@dreamchaser.org> From: Yuri In-Reply-To: <080af465-82c9-6347-473d-0235d6982278@dreamchaser.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4QDM2Y6tPBz4G8q X-Spamd-Bar: / X-Spamd-Result: default: False [-0.40 / 15.00]; R_SPF_ALLOW(-0.20)[+ip4:64.147.123.21]; R_DKIM_ALLOW(-0.20)[aetern.org:s=fm3,messagingengine.com:s=fm3]; ASN(0.00)[asn:29838, ipnet:64.147.123.0/24, country:US]; DKIM_TRACE(0.00)[aetern.org:+,messagingengine.com:+]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; local_wl_from(0.00)[yuri@aetern.org] X-Rspamd-Pre-Result: action=no action; module=multimap; Matched map: local_wl_from X-ThisMailContainsUnwantedMimeParts: N Gary Aitken wrote: > I don't think I've specifically set any of these: > > $ sysctl net.inet | grep blackhole > net.inet.tcp.v6pmtud_blackhole_mss: 1220 > net.inet.tcp.pmtud_blackhole_mss: 1200 > net.inet.tcp.pmtud_blackhole_detection: 0 > net.inet.tcp.blackhole: 2 > net.inet.udp.blackhole: 1 > net.inet.sctp.blackhole: 0 > > Can someone explain to me the logic behind the last 3 (tcp,udp,sctp) > defaults, and why they aren't all at 2? blackhole(4) says it's disabled by default, and indeed all 3 are 0 on my system, so something might have set it for you after all? $ sysctl net.inet.tcp.blackhole net.inet.udp.blackhole net.inet.sctp.blackhole net.inet.tcp.blackhole: 0 net.inet.udp.blackhole: 0 net.inet.sctp.blackhole: 0