{"provider_url":"https://hatena.blog","height":"190","blog_url":"https://nice20.hatenadiary.org/","url":"https://nice20.hatenadiary.org/entry/20070521/p1","type":"rich","published":"2007-05-21 00:00:00","provider_name":"Hatena Blog","author_name":"nice20","categories":["unix"],"version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnice20.hatenadiary.org%2Fentry%2F20070521%2Fp1\" title=\" Linux SYN\u30d1\u30b1\u30c3\u30c8\u53d6\u308a\u3053\u307c\u3057 (2) - LowPriority\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"blog_title":"LowPriority","description":"\u524d\u56de\u306e\u7d9a\u304d\u3002 \u30d1\u30b1\u30c3\u30c8\u81ea\u4f53\u3092\u96f6\u3055\u305a\u306b\u51e6\u7406\u306b\u5165\u3063\u305f\u5f8c\u306bSYN\u3092\u843d\u3068\u3059\u306e\u306f\u4ee5\u4e0b3\u30d1\u30bf\u30fc\u30f3\u3002 syncookie\u7121\u52b9\u6642\u306bsyn\u306ebacklog(tcp_max_syn_backlog)\u304c\u6ea2\u308c\u3066\u3044\u308b listen\u306ebacklog\u304c\u6ea2\u308c\u3066\u3044\u308b(3way-handshake\u5b8c\u4e86\u5f8c\u306eaccept\u5f85\u3061\u63a5\u7d9a) net.ipv4.tcp_tw_recycle\u306e\u5236\u9650\u306b\u62b5\u89e6 \u3067\u3001\u4eca\u56de\u554f\u984c\u306b\u306a\u3063\u3066\u3044\u305f\u306e\u306f\u6700\u5f8c\u306etcp_tw_recycle\u3078\u306e\u62b5\u89e6\u3060\u3063\u305f\u3002 \u73fe\u8c61\u3068\u3057\u3066\u767a\u751f\u3057\u3046\u308b\u306e\u306f\u3001\u4ee5\u4e0b\u306e\u6761\u4ef6\u3092\u3059\u3079\u3066\u6e80\u305f\u3059\u5834\u5408 \u30b5\u30fc\u30d0\u5074\u3067net.ipv4.tcp_tw_recycle\u304c\u6709\u52b9 TCP\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u4f7f\u7528 \u540c\u4e00IP\u2026","title":" Linux SYN\u30d1\u30b1\u30c3\u30c8\u53d6\u308a\u3053\u307c\u3057 (2)","author_url":"https://blog.hatena.ne.jp/nice20/","width":"100%"}