Last Updated on April 16, 2024
add these lines to /etc/sysctl.conf :
# max open files fs.file-max = 51200 # max read buffer net.core.rmem_max = 67108864 # max write buffer net.core.wmem_max = 67108864 # default read buffer net.core.rmem_default = 65536 # default write buffer net.core.wmem_default = 65536 # max processor input queue net.core.netdev_max_backlog = 250000 # max backlog net.core.somaxconn = 4096 # resist SYN flood attacks net.ipv4.tcp_syncookies = 1 # reuse timewait sockets when safe net.ipv4.tcp_tw_reuse = 1 # turn off fast timewait sockets recycling # net.ipv4.tcp_tw_recycle = 0 # short FIN timeout net.ipv4.tcp_fin_timeout = 30 # short keepalive time net.ipv4.tcp_keepalive_time = 1200 # outbound port range net.ipv4.ip_local_port_range = 10000 65000 # max SYN backlog net.ipv4.tcp_max_syn_backlog = 8192 # max timewait sockets held by system simultaneously net.ipv4.tcp_max_tw_buckets = 5000 # turn on TCP Fast Open on both client and server side net.ipv4.tcp_fastopen = 3 # TCP receive buffer net.ipv4.tcp_rmem = 4096 87380 67108864 # TCP write buffer net.ipv4.tcp_wmem = 4096 65536 67108864 # turn on path MTU discovery net.ipv4.tcp_mtu_probing = 1 net.ipv4.tcp_timestamps=1 net.ipv4.ip_no_pmtu_disc = 1 net.ipv4.tcp_mem = 25600 51200 102400 net.ipv4.ip_default_ttl=129
sysctl -p /etc/sysctl.conf
References
https://shadowsocks.org/en/config/advanced.html
https://linode.com/docs/networking/vpn/create-a-socks5-proxy-server-with-shadowsocks-on-ubuntu-and-centos7/
https://maxlv.net/optimize-a-shadowsocks-server/