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Mac OS X (Snow Leopard)ã§Serial Console (シリアルコンソール) | ytsuboi's blog
Macã§ã‚‚PCã§ã‚‚ã€æœ€è¿‘ã¯ã‚·ãƒªã‚¢ãƒ«(Serial)端åを見ã‹ã‘ãªããªã£ã¦ã—ã¾ã£ãŸã€‚ 僕も昔ã¯ä»•äº‹ãƒžã‚·ãƒ³ã¯Windowsを使ã£ã¦ã„ãŸã®ã ã‘ã‚Œã©ã‚‚ã€æœ€è¿‘ã¯Mac一辺倒ã ã—ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯æ©Ÿå™¨ã®è¨å®šã‚’ã™ã‚‹ã«ã‚‚ã€Kindleã‚„NASãªã©ã®çµ„ã¿è¾¼ã¿Linux機器をã¯ã£ãã™ã‚‹ã«ã‚‚シリアル端åãŒå‘½ãªã®ã§ã€Macã§ã‚·ãƒªã‚¢ãƒ«é€šä¿¡ã‚’ã§ãるよã†ã«ã—ã¦ã¿ãŸã€‚ ã¾ãšã¯USBシリアルアダプター 下調ã¹ã‚’ã—ãŸã¨ã“ã‚ã€ç§‹æœˆé›»å通商ãŒå£²ã£ã¦ã„る「FT232RL USBシリアル変æ›ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã€ã£ã¦ã„ã†ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ãŒ950円ã¨å®‰ã‹ã£ãŸã€‚モジュールãªã®ã§ã€çµ„ã¿è¾¼ã¿Linux機器ã«æŽ¥ç¶šã™ã‚‹ãŸã‚ãªã©ã«ä½¿ã†ã®ãŒå‰ã€‚TTLレベルã§ã‚·ãƒªã‚¢ãƒ«é€šä¿¡ã‚’ã—よã†ã¨ã™ã‚‹ã¨ã€å®¶é›»é‡è²©åº—ãªã©ã§å£²ã£ã¦ã„ã‚‹ã‚±ãƒ¼ãƒ–ãƒ«ã‚’æ”¹é€ ã™ã‚‹ã‹ã€ã“ã†ã„ã†ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’è²·ã†ã‹ã‚’é¸æŠžã™ã‚‹ã“ã¨ã«ãªã‚‹ã€‚ Webサイトや説明書ã«ã¯ã€Windowsã®ãƒ‰ãƒ©ã‚¤ãƒã®ã“ã¨ã—ã‹æ›¸ã„ã¦ç„¡ã‹ã£ãŸã‘ã‚Œã©ã‚‚ã€ãƒ
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Let's code a TCP/IP stack, 1: Ethernet & ARP
Writing your own TCP/IP stack may seem like a daunting task. Indeed, TCP has accumulated many specifications over its lifetime of more than thirty years. The core specification, however, is seemingly compact1 - the important parts being TCP header parsing, the state machine, congestion control and retransmission timeout computation. The most common layer 2 and layer 3 protocols, Ethernet and IP re
The complete guide to Go net/http timeouts
When writing an HTTP server or client in Go, timeouts are amongst the easiest and most subtle things to get wrong: there’s many to choose from, and a mistake can have no consequences for a long time, until the network glitches and the process hangs. HTTP is a complex multi-stage protocol, so there's no one-size fits all solution to timeouts. Think about a streaming endpoint versus a JSON API versu
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net.ipv4.tcp_tw_recycle ã¯å»ƒæ¢ã•ã‚Œã¾ã—㟠― ãã®å±é™ºæ€§ã‚’ç†è§£ã™ã‚‹ - Qiita
Disclaimer ç§ã¯ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®å‹‰å¼·ã‚‚ã¡ã‚ƒã‚“ã¨ã—ãŸã“ã¨ãªã„ã—ã€Linux ã®ã‚½ãƒ¼ã‚¹èªã‚€ã®ã‚‚ã¯ã˜ã‚ã¦ãªç´ 人ã§ã™ã€‚ 何ã‹ãŠã‹ã—ãªã¨ã“ã‚ãªã©ã‚ã‚Œã°ã€é æ…®ãªãコメント欄ã§ã¾ã•ã‹ã‚Šã‚’ãŠé¡˜ã„ã„ãŸã—ã¾ã™ã€‚ ソースコードã®å¼•ç”¨ã«é–¢ã—㦠本文ä¸ã§ Linux ã®ã‚³ãƒ¼ãƒ‰ï¼ãƒ‰ã‚ュメントを引用ã—ã¦ã„る箇所ãŒã‚ã‚Šã¾ã™ãŒã€ã™ã¹ã¦ã‚¿ã‚° v4.11 ã®ã‚‚ã®ã§ã™ã€‚ã¾ãŸã€æ—¥æœ¬èªžã®ã‚³ãƒ¡ãƒ³ãƒˆãƒ»ç¿»è¨³æ–‡ã¯ç†è€…ãŒå…¥ã‚ŒãŸã‚‚ã®ã§ã™ã€‚ TL; DR Linux ã®ã‚«ãƒ¼ãƒãƒ«ãƒ‘ラメータ net.ipv4.tcp_tw_recycle ã¯ã€ãƒãƒ¼ã‚¸ãƒ§ãƒ³4.12ã‹ã‚‰å»ƒæ¢ã•ã‚Œã¾ã—ãŸã€‚ 今後ã¯ã“ã®è¨å®šã¯è¡Œã‚ãªã„よã†ã«ã—ã¾ã—ょã†ï¼ˆã¨ã„ã†ã‹ã§ãã¾ã›ã‚“）。 一方ã€net.ipv4.tcp_tw_reuse ã¯å®‰å…¨ã§ã‚ã‚Šã€å¼•ã続ã利用ã§ãã¾ã™ã€‚ …ã¨ã„ã†ã ã‘ã®è©±ãªã®ã§ã™ãŒã€è‡ªåˆ†ç”¨ã«ãƒ¡ãƒ¢ãŒã¦ã‚‰çµŒç·¯ãƒ»èƒŒæ™¯ãªã©ã‚’記録ã—ã¦ãŠãã¾ã™ã€‚ ãªã‚“ã§æ°—ãŒã¤ã„ãŸã‹ ã“ã®ãƒ‘ラ
Beej's Guide to Network Programming
Beej's Guide to Network Programming Using Internet Sockets (Click here for other guides!) (Notably, this is a WIP guide to general C Programming right here!) Hello, one and all! This is my little how-to guide on network programming using Internet sockets, or "sockets programming", for those of you who prefer it. The sockets API, though started by the Berkeley folk, has been ported to many many pla
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pingコマンドã¯ã€ICMPã®Echoプãƒãƒˆã‚³ãƒ«ã‚’使ã£ãŸã€IPパケットã®åˆ°é”å¯èƒ½æ€§ã‚’調査ã™ã‚‹ã‚³ãƒžãƒ³ãƒ‰ã§ã‚ã‚Šã€TCP/IPã«ãŠã‘る最も基本的ãªãƒ„ールã®1ã¤ã§ã‚る（pingã®åŸºæœ¬çš„ãªä½¿ã„æ–¹ã«ã¤ã„ã¦ã¯é–¢é€£è¨˜äº‹å‚照）。ã“れを使ã†ã“ã¨ã«ã‚ˆã‚Šã€å¤§ã–ã£ã±ã§ã¯ã‚ã‚‹ãŒã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®é€Ÿåº¦ï¼ˆå¸¯åŸŸï¼‰ã‚’調ã¹ã‚‹ã“ã¨ã‚‚å¯èƒ½ã§ã‚る。本TIPSã§ã¯ã€ãã®æ–¹æ³•ã«ã¤ã„ã¦è§£èª¬ã™ã‚‹ã€‚ æ“作方法 â—ã©ã†ã—ã¦ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®é€Ÿåº¦ã‚’pingã§æ¸¬å®šã§ãã‚‹ã®ã‹ï¼Ÿ pingコマンドを実行ã™ã‚‹ã¨ã€ICMPã®Echoè¦æ±‚パケットãŒæŒ‡å®šã•ã‚ŒãŸIPアドレスã«é€ä¿¡ã•ã‚Œã€é€šå¸¸ã¯ãã®ICMPパケットãŒãã®ã¾ã¾ç›¸æ‰‹ã‹ã‚‰è¿”é€ã•ã‚Œã¦ãる。ãã‚Œã¨åŒæ™‚ã«ã€ãƒ‘ケットをé€ä¿¡ã—ã¦ã‹ã‚‰è¿”ã£ã¦ãã‚‹ã¾ã§ã®æ‰€è¦æ™‚é–“ãŒè¡¨ç¤ºã•ã‚Œã‚‹ã€‚ICMPã‚„Echoパケットã®è©³ç´°ã«ã¤ã„ã¦ã¯ã€å³ä¸Šã®é–¢é€£è¨˜äº‹ã‚’å‚ç…§ã—ã¦ã„ãŸã ããŸã„。 Windows OSã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã§ã¯ã€pingã§é€ä¿¡ã•ã‚Œã‚‹ã€Œãƒ‡ãƒ¼ã‚¿ã‚µã‚¤
The revenge of the listening sockets
Back in November we wrote a blog post about one latency spike. Today I'd like to share a continuation of that story. As it turns out, the misconfigured rmem setting wasn't the only source of added latency. It looked like Mr. Wolf hadn't finished his job. After adjusting the previously discussed rmem sysctl we continued monitoring our systems' latency. Among other things we measured ping times to o
Linux kernel bug delivers corrupt TCP/IP data to Mesos, Kubernetes, Docker containers
(Edit: This article is now up on hacker news, feel free to discuss there) The Linux Kernel has a bug that causes containers that use veth devices for network routing (such as Docker on IPv6, Kubernetes, Google Container Engine, and Mesos) to not check TCP checksums. This results in applications incorrectly receiving corrupt data in a number of situations, such as with bad networking hardware. The
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https://y2web.net/blog/inet/testing-iij-seilx86-on-apu2c4-5774/
GitHub - rtr7/router7: router7 is a small home internet router completely written in Go. It is implemented as a gokrazy appliance.
GitHub - ocochard/graphpath: Graphpath generates an ASCII network diagram from the route table of a Unix/Linux
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