{"id":2789,"date":"2017-10-17T20:25:43","date_gmt":"2017-10-17T12:25:43","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=2789"},"modified":"2017-10-17T20:25:43","modified_gmt":"2017-10-17T12:25:43","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e6%94%b9linux%e7%9a%84ttl%e5%80%bc","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/jishu\/fuwuqi\/%e5%a6%82%e4%bd%95%e4%bf%ae%e6%94%b9linux%e7%9a%84ttl%e5%80%bc\/","title":{"rendered":"\u5982\u4f55\u4fee\u6539Linux\u7684TTL\u503c"},"content":{"rendered":"<p>\u7f51\u7edc\u9ed1\u5ba2\u5982\u679c\u7528ping\u547d\u4ee4\u53bb\u63a2\u6d4b\u00a0 \u4e00\u4e2a\u4e3b\u673a\uff0c\u6839\u636eTTL\u57fa\u6570\u53ef\u4ee5\u63a8\u6d4b\u64cd\u4f5c\u7cfb\u7edf\u7684\u7c7b\u578b\u3002\u5bf9\u4e8e\u4e00\u4e2a\u6ca1\u6709\u7ecf\u8fc7\u4efb\u4f55\u7f51\u5173\u548c\u8def\u7531\u7684\u7f51\u7edc\uff0c\u76f4\u63a5ping\u5bf9\u65b9\u7cfb\u7edf\u5f97\u5230\u7684TTL\u503c\uff0c\u88ab\u53eb\u505a\u201cTTL\u57fa\u6570\u201d\u3002\u7f51\u7edc\u4e2d\uff0c\u6570\u636e\u5305\u6bcf\u7ecf\u8fc7\u4e00\u4e2a\u8def\u7531\u5668\uff0cTTL\u5c31\u4f1a\u51cf1\uff0c\u5f53TTL\u4e3a0\u65f6\uff0c\u8fd9\u4e2a\u6570\u636e\u5305\u5c31\u4f1a\u88ab\u4e22\u5f03\u3002<\/p>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0cWindows\u7684TTL\u7684\u57fa\u6570\u662f128\uff0c\u800c\u65e9\u671f\u7684Red Hat\u00a0Linux\u548cSolaris\u7684TTL\u57fa\u6570\u662f255\uff0cFreeBSD\u548c\u65b0\u7248\u672c\u7684Red Hat Linux\u7684TTL\u57fa\u6570\u662f64\u3002\u6bd4\u5982\uff0cping\u4e00\u4e2aRed Hat\u7cfb\u7edf\uff0c\u663e\u793a\u5982\u4e0b\uff1a<\/p>\n<p>[root@ www.linuxidc.com\u00a0~]# ping 127.0.0.1<br \/>\nPING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.<br \/>\n64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.030 ms<br \/>\n64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.013 ms<br \/>\n64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.013 ms<br \/>\n64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.012 ms<\/p>\n<p>\u7528\u4ee5\u4e0b\u547d\u4ee4\u4fee\u6539Red Hat Linux\u7684TTL\u57fa\u6570\u4e3a128\uff08\u672c\u6765\u4e3a64\uff09\uff1a<br \/>\n# echo 128 &gt; \/proc\/sys\/net\/ipv4\/ip_default_ttl<\/p>\n<p>\u4e0a\u9762\u7684128\u5176\u5b9e\u53ef\u4ee5\u662f\u4efb\u4f55\u6570\uff0c\u4f46\u662f\u4e3a\u4e86\u4f2a\u88c5\u6210\u662fWIN\u7cfb\u7edf\uff0c\u6240\u4ee5\u9009\u62e9\u8fd9\u4e2a\u6570\u5b57<br \/>\n\u82e5\u60f3\u4f7f\u8bbe\u7f6e\u6c38\u4e45\u751f\u6548\uff0c\u53ef\u4ee5\u4fee\u6539\/etc\/sysctl.conf\u914d\u7f6e\u6587\u4ef6\uff0c\u6dfb\u52a0\u5982\u4e0b\u4e00\u884c\uff1a<\/p>\n<p>net.ipv4.ip_default_ttl = 128<\/p>\n<p>\u4fdd\u5b58\u9000\u51fa\u540e\u9700\u8981\u91cd\u542f\u4e0b\uff0c\u518dping \u4e0b\uff0cTTL\u57fa\u6570\u5c31\u53d8\u4e3a128\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7f51\u7edc\u9ed1\u5ba2\u5982\u679c\u7528ping\u547d\u4ee4\u53bb\u63a2\u6d4b\u00a0 \u4e00\u4e2a\u4e3b\u673a\uff0c\u6839\u636eTTL\u57fa\u6570\u53ef\u4ee5\u63a8\u6d4b\u64cd\u4f5c\u7cfb\u7edf\u7684\u7c7b\u578b\u3002\u5bf9\u4e8e\u4e00\u4e2a\u6ca1\u6709\u7ecf\u8fc7\u4efb\u4f55\u7f51\u5173\u548c &#8230; <a title=\"\u5982\u4f55\u4fee\u6539Linux\u7684TTL\u503c\" class=\"read-more\" href=\"https:\/\/cn.hostease.com\/xueyuan\/jishu\/fuwuqi\/%e5%a6%82%e4%bd%95%e4%bf%ae%e6%94%b9linux%e7%9a%84ttl%e5%80%bc\/\" aria-label=\"\u9605\u8bfb \u5982\u4f55\u4fee\u6539Linux\u7684TTL\u503c\">\u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[49,9],"tags":[],"class_list":["post-2789","post","type-post","status-publish","format-standard","hentry","category-linux","category-fuwuqi"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2789","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=2789"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2789\/revisions"}],"predecessor-version":[{"id":2790,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2789\/revisions\/2790"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=2789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=2789"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=2789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}