Network

tags: P2P,Starcoin Web3 StarTrek,Network source: https://docs.libp2p.io/ A set of protocols for peer identity, discover, routing, transport and more. Peer-to-peer network Peers or nodes communicate with oen another directly, it’s different from the client-server architecture. libp2p Solved Transport abstract data transmission and receipt to adapte many protocols, include the future protocols. Identity use public key cryptography as the basis of peer identity， with this: It gives each peer a globally unique “name”, in the form of a PeerId....

tags: Linux,Network,Tools netstat -s: show network status(errors) # show udp status $ netstat -s --udp Udp: 437.0k/s packets received 0.0/s packets to unknown port received. 386.9k/s packet receive errors 0.0/s packets sent RcvbufErrors: 123.8k/s SndbufErrors: 0 InCsumErrors: 0

tags: Linux,Network,TCP,UDP,Tools ethtool -S: Reveal where the packets actuaaly went receiver$ watch 'sudo ethtool -S eth2 |grep rx' rx_nodesc_drop_cnt: 451.3k/s rx-0.rx_packets: 8.0/s rx-1.rx_packets: 0.0/s rx-2.rx_packets: 0.0/s rx-3.rx_packets: 0.5/s rx-4.rx_packets: 355.2k/s rx-5.rx_packets: 0.0/s rx-6.rx_packets: 0.0/s rx-7.rx_packets: 0.5/s rx-8.rx_packets: 0.0/s rx-9.rx_packets: 0.0/s rx-10.rx_packets: 0.0/s

tags: Linux,High Performance,Network,ethtool source: The Cloudflare Blog. “How to Receive a Million Packets per Second,” June 16, 2015. http://blog.cloudflare.com/how-to-receive-a-million-packets/. What are Multi-queue NICs RX queue was used to pass packets between hardware and kernel. Now days NICs support multiple RX queues: Each RX queue is pinned to a separate CPU. Multi-queue hashing algorithms Use a hash from packet to decide the RX queue number. The hash is usually counted from a tuple (src IP, dst IP, src port, dst port)....

tags: Network,Linux,Tools

tags: Network,UDP,High Performance,iptables,ethtool,netstat,NUMA source: The Cloudflare Blog. “How to Receive a Million Packets per Second,” June 16, 2015. http://blog.cloudflare.com/how-to-receive-a-million-packets/. Keys: Make sure traffic won’t be interfered with by the iptables iptables -I INPUT 1 -p udp --dport 4321 -j ACCEPT iptables -t raw -I PREROUTING 1 -p udp --dport 4321 -j NOTRACK #+end_src[[id:C471A6FF-7F4E-4E23-B070-14CE146BFA14][Multi-queue NICs]] 2. The first bottleneck ​ + All packets are received by a signal RX queue, checked out with =ethtool -S=....

tags: Network

tags: Network

tags: Network,Message Queue

tags: Network,Bufferbloat source: “Bufferbloat - Dark Buffers in the Internet,” 2011, 36.

tags: Network

tags: TCP,Network,5W1H TCP Fast Open(TFO): WHY TFO is proposed? TCP Three-Way Handshake for every new TCP connection is too expensive. WHAT is the TFO? TCP Fast Open (TFO) is a mechanism that aims to reduce the latency penalty imposed on new TCP connections. HOW the TFO reduce the latency on new TCP connections? TFO allows data transfer within the SYN packet. WHEN the TFO is avaiable. TFO support is now avaiable in Linux 3....

tags: CoDel,Network source: “Controlling Queue Delay - ACM Queue.” Accessed January 11, 2022. https://queue.acm.org/detail.cfm?id=2209336. Bufferbloat What is the bufferbloat? In the internet, large buffer is used everywhere: PC Router/Swtich/ISP Server The large may cause delay. Why the bufferbloat still with us and made increaingly critical by two trends? Cheap memory. Complicate network paths. How to sloves the problem? AQM(active queue management) is the known solution, but it’s difficult to implement, so even it has been known two decades but still not been widely deployed....

tags: Network,Bufferbloat,AQM

tags: High Performance Browser Networking,Network Defination: Latency - Time cost between sending and receiving, lower is better. Bandwitdh - throughtput, higher is better. Things affect to Latency: Distance of fiber, Speed of Light, that could be optimized by CDN. Bufferbloat of router, large buffer make queue delay, addressed by CoDel. ISP gateway.

tags: 计划读的书,HTTP,High Performance,Network 在线： https://hpbn.co/ source: Grigorik, Ilya. High-Performance Browser Networking. Beijing ; Sebastopol, CA: O’Reilly, 2013. “Good developers know how things work. Great developers know why things work.”

tags: Network

tags: MySQL,Network https://stackoverflow.com/a/38389851/2873718 MySQL 授权用户子网段需要使用: 172.16.0.0/255.240.0.0 而不能使用 172.16.0.0/12

tags: Over the Wall,Network xinetd 代理 SMTP 和 IMAP 通过 xinetd 代理 SMTP 和 IMAP 实现 gmail 翻墙。 配置服务端 service imap { type = UNLISTED port = 993 bind = 0.0.0.0 socket_type = stream wait = no user = nobody redirect = imap.gmail.com 993 per_source = UNLIMITED cps = 100 2 } service smtp-465 { type = UNLISTED port = 465 bind = 0.0.0.0 socket_type = stream wait = no user = nobody redirect = smtp....