​TCP congestion control​
​relayd​
​ZFS​
​DTrace​
​CAM Target Layer(ctl)​
​HA cluster​
sysctl net.inet.tcp.ccnet.inet.tcp.cc.available: newrenonet.inet.tcp.cc.algorithm: newreno​kldload cccubickldload ccvegaskldload cccdg
​https://man.openbsd.org/relayd.conf.5 layer 3 and/or layer 7 load-balancer, application layer gateway, or transparent proxy
​https://man.openbsd.org/pf.conf​
pass in allpass in from any to anypass in proto tcp from any port < 1024 to anypass in proto tcp from any to any port 25pass in proto tcp from 10.0.0.0/8 port >= 1024 \to ! 10.1.2.3 port != sshpass in proto tcp from any os "OpenBSD"pass in proto tcp from route "DTAG"
sudo ipfw add fwd 127.0.0.1,12345 tcp from not me to any 80 in via en1sudo ipfw add fwd 127.0.0.1,12345 tcp from not me to any 443 in via en1
​https://www.freebsd.org/cgi/man.cgi?query=zpool​
zpool create pool_name da0p3 da1p3zpool create pool_name \mirror da0 da1 \mirror da2 da3 \log mirror da4 da5zpool add pool cache da2 da3​zpool listzpool get all pool_namezpool status pool_namezpool iostat -v pool_name 5zpool list -v pool_name
​https://wiki.freebsd.org/DTrace/Tutorial​
The ctl subsystem provides SCSI target devices emulation
​https://bsdmag.org/nearly-online-zpool-switching-two-freebsd-machines/​