{"id":7371,"date":"2015-06-02T17:08:54","date_gmt":"2015-06-02T09:08:54","guid":{"rendered":"http:\/\/jpuyy.com\/?p=7371"},"modified":"2016-12-09T15:19:45","modified_gmt":"2016-12-09T07:19:45","slug":"net-ipv4-tcp_timestamps","status":"publish","type":"post","link":"https:\/\/jpuyy.com\/?p=7371","title":{"rendered":"\u4f7f\u7528nat\u65f6net.ipv4.tcp_timestamps\u53c2\u6570"},"content":{"rendered":"

\u5728\u4f7f\u7528 iptables \u505a nat \u65f6\uff0c\u53d1\u73b0\u5185\u7f51\u673a\u5668 ping \u67d0\u4e2a\u57df\u540d ping \u7684\u901a\uff0c\u800c\u4f7f\u7528 curl \u6d4b\u8bd5\u4e0d\u901a<\/p>\n

\u539f\u6765\u662f net.ipv4.tcp_timestamps \u8bbe\u7f6e\u4e86\u4e3a 1 \uff0c\u5373\u542f\u7528\u65f6\u95f4\u6233<\/p>\n

cat \/proc\/sys\/net\/ipv4\/tcp_timestamps<\/pre>\n
\u8fd9\u65f6\u5c06\u5176\u5173\u95ed<\/p>\n
\u4fee\u6539 \/etc\/sysctl.conf \u4e2d<\/p>\n
net.ipv4.tcp_timestamps = 0<\/pre>\n
sysctl -p<\/pre>\n
\u751f\u6548<\/p>\n
\u539f\u7406<\/p>\n
\u95ee\u9898\u51fa\u5728\u4e86 tcp \u4e09\u6b21\u63e1\u624b\uff0cping \u7684\u901a icmp ok \uff0chttp ssh mysql \u90fd\u4e0d ok<\/p>\n
\u7ecf\u8fc7nat\u4e4b\u540e\uff0c\u5982\u679c\u524d\u9762\u76f8\u540c\u7684\u7aef\u53e3\u88ab\u4f7f\u7528\u8fc7\uff0c\u4e14\u65f6\u95f4\u6233\u5927\u4e8e\u8fd9\u4e2a\u94fe\u63a5\u53d1\u51fa\u7684syn\u4e2d\u7684\u65f6\u95f4\u6233\uff0c\u670d\u52a1\u5668\u4e0a\u5c31\u4f1a\u5ffd\u7565\u6389\u8fd9\u4e2asyn\uff0c\u4e0d\u8fd4\u4f1asyn-ack\u6d88\u606f\uff0c\u8868\u73b0\u4e3a\u7528\u6237\u65e0\u6cd5\u6b63\u5e38\u5b8c\u6210tcp3\u6b21\u63e1\u624b\uff0c\u4ece\u800c\u4e0d\u80fd\u6253\u5f00web\u9875\u9762\u3002\u5728\u4e1a\u52a1\u95f2\u65f6\uff0c\u5982\u679c\u7528\u6237nat\u7684\u7aef\u53e3\u6ca1\u6709\u88ab\u4f7f\u7528\u8fc7\u65f6\uff0c\u5c31\u53ef\u4ee5\u6b63\u5e38\u6253\u5f00\uff1b\u4e1a\u52a1\u5fd9\u65f6\uff0cnat\u7aef\u53e3\u91cd\u590d\u4f7f\u7528\u7684\u9891\u7387\u9ad8\uff0c\u5f88\u96be\u5206\u5230\u6ca1\u6709\u88ab\u4f7f\u7528\u7684\u7aef\u53e3\uff0c\u4ece\u800c\u4ea7\u751f\u8fd9\u79cd\u95ee\u9898\u3002<\/p>\n
\u53ea\u6709\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u5f00\u542f\u65f6\u95f4\u6233\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u4f1a\u51fa\u73b0\u80fdping\u901a\u4e0d\u80fd\u5efa\u7acbtcp\u4e09\u6b21\u63e1\u624b\u7684\u60c5\u51b5<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u4f7f\u7528 iptables \u505a nat \u65f6\uff0c\u53d1\u73b0\u5185\u7f51\u673a\u5668 ping \u67d0\u4e2a\u57df\u540d ping \u7684\u901a\uff0c\u800c\u4f7f\u7528 curl \u6d4b\u8bd5\u4e0d\u901a \u539f\u6765\u662f net.ipv4.tcp_timestamps \u8bbe\u7f6e\u4e86\u4e3a 1 \uff0c\u5373\u542f\u7528\u65f6\u95f4\u6233 cat \/proc\/sys\/net\/ipv4\/tcp_timestamps \u8fd9\u65f6\u5c06\u5176\u5173\u95ed \u4fee\u6539 \/etc\/sysctl.conf \u4e2d net.ipv4.tcp_timestamps = 0 sysctl -p \u751f\u6548 \u539f\u7406 \u95ee\u9898\u51fa\u5728\u4e86 tcp \u4e09\u6b21\u63e1\u624b\uff0cping \u7684\u901a icmp ok \uff0chttp ssh mysql \u90fd\u4e0d ok \u7ecf\u8fc7nat\u4e4b\u540e\uff0c\u5982\u679c\u524d\u9762\u76f8\u540c\u7684\u7aef\u53e3\u88ab\u4f7f\u7528\u8fc7\uff0c\u4e14\u65f6\u95f4\u6233\u5927\u4e8e\u8fd9\u4e2a\u94fe\u63a5\u53d1\u51fa\u7684syn\u4e2d\u7684\u65f6\u95f4\u6233\uff0c\u670d\u52a1\u5668\u4e0a\u5c31\u4f1a\u5ffd\u7565\u6389\u8fd9\u4e2asyn\uff0c\u4e0d\u8fd4\u4f1asyn-ack\u6d88\u606f\uff0c\u8868\u73b0\u4e3a\u7528\u6237\u65e0\u6cd5\u6b63\u5e38\u5b8c\u6210tcp3\u6b21\u63e1\u624b\uff0c\u4ece\u800c\u4e0d\u80fd\u6253\u5f00web\u9875\u9762\u3002\u5728\u4e1a\u52a1\u95f2\u65f6\uff0c\u5982\u679c\u7528\u6237nat\u7684\u7aef\u53e3\u6ca1\u6709\u88ab\u4f7f\u7528\u8fc7\u65f6\uff0c\u5c31\u53ef\u4ee5\u6b63\u5e38\u6253\u5f00\uff1b\u4e1a\u52a1\u5fd9\u65f6\uff0cnat\u7aef\u53e3\u91cd\u590d\u4f7f\u7528\u7684\u9891\u7387\u9ad8\uff0c\u5f88\u96be\u5206\u5230\u6ca1\u6709\u88ab\u4f7f\u7528\u7684\u7aef\u53e3\uff0c\u4ece\u800c\u4ea7\u751f\u8fd9\u79cd\u95ee\u9898\u3002 \u53ea\u6709\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u5f00\u542f\u65f6\u95f4\u6233\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u4f1a\u51fa\u73b0\u80fdping\u901a\u4e0d\u80fd\u5efa\u7acbtcp\u4e09\u6b21\u63e1\u624b\u7684\u60c5\u51b5  <\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-7371","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/7371","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7371"}],"version-history":[{"count":4,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/7371\/revisions"}],"predecessor-version":[{"id":8049,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/7371\/revisions\/8049"}],"wp:attachment":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}