{"id":208862,"date":"2025-09-29T23:34:56","date_gmt":"2025-09-29T15:34:56","guid":{"rendered":"https:\/\/www.server.hk\/blog\/208862\/"},"modified":"2025-09-29T23:35:01","modified_gmt":"2025-09-29T15:35:01","slug":"vps-ping","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208862\/","title":{"rendered":"\u9999\u6e2fVPS\u6e38\u620f\u670d\u52a1\u5668PING\u8fc7\u9ad8\uff1f6\u6b65\u5b9e\u6218\u4f18\u5316\u63d0\u5347\u54cd\u5e94\u4e0e\u7a33\u5b9a\u6027"},"content":{"rendered":"<p>\u9488\u5bf9\u5728\u9999\u6e2f\u90e8\u7f72\u7684\u6e38\u620f\u670d\u52a1\u5668\uff0c\u5c24\u5176\u662f\u4f7f\u7528\u9999\u6e2fVPS\u65f6\u5e38\u89c1\u7684\u9ad8PING\u95ee\u9898\uff0c\u5f88\u591a\u7ad9\u957f\u548c\u8fd0\u7ef4\u56e2\u961f\u90fd\u4f1a\u611f\u5230\u5934\u75bc\u3002PING\u503c\u9ad8\u4e0d\u4ec5\u5f71\u54cd\u73a9\u5bb6\u4f53\u9a8c\uff0c\u8fd8\u53ef\u80fd\u5bfc\u81f4\u6389\u7ebf\u3001\u5361\u987f\u548c\u7ade\u6280\u4e0d\u516c\u5e73\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u548c\u5f00\u53d1\u8005\uff0c\u63d0\u4f9b\u4e00\u5957\u5b9e\u6218\u6027\u7684\u201c6\u6b65\u201d\u4f18\u5316\u6d41\u7a0b\uff0c\u6df1\u5165\u89e3\u91ca\u5e95\u5c42\u539f\u7406\u4e0e\u914d\u7f6e\u6280\u5de7\uff0c\u5e2e\u52a9\u4f60\u63d0\u5347\u54cd\u5e94\u901f\u5ea6\u4e0e\u7a33\u5b9a\u6027\u3002<\/p>\n<h2>\u4e3a\u4f55PING\u4f1a\u8fc7\u9ad8\uff1a\u7f51\u7edc\u4e0e\u7cfb\u7edf\u5c42\u9762\u7684\u539f\u7406<\/h2>\n<p>\u5728\u7740\u624b\u4f18\u5316\u4e4b\u524d\uff0c\u5fc5\u987b\u7406\u89e3\u5bfc\u81f4\u9ad8PING\u7684\u51e0\u4e2a\u5173\u952e\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li><strong>\u5730\u7406\u4e0e\u94fe\u8def\u5ef6\u8fdf\uff1a<\/strong>\u7269\u7406\u8ddd\u79bb\u51b3\u5b9a\u4e86\u5149\u7ea4\u4f20\u64ad\u65f6\u5ef6\uff0c\u9999\u6e2f\u670d\u52a1\u5668\u76f8\u5bf9\u4e2d\u56fd\u5927\u9646\u3001\u4e1c\u5357\u4e9a\u5ef6\u8fdf\u8f83\u4f4e\uff0c\u4f46\u4e0e\u5317\u7f8e\u76f8\u6bd4\u81ea\u7136\u66f4\u4f18\u6216\u66f4\u5dee\u53d6\u51b3\u4e8e\u76ee\u6807\u7528\u6237\u5206\u5e03\uff08\u4f8b\u5982\u7f8e\u56fdVPS\u9002\u5408\u5317\u7f8e\u73a9\u5bb6\uff09\u3002<\/li>\n<li><strong>\u8def\u7531\u4e0e\u7f51\u7edc\u62e5\u585e\uff1a<\/strong>\u4e2d\u95f4\u81ea\u6cbb\u7cfb\u7edf\uff08AS\uff09\u8def\u5f84\u3001BGP\u7b56\u7565\u3001\u62e5\u585e\u70b9\u53ca\u8de8\u5883\u94fe\u8def\u8d28\u91cf\u90fd\u4f1a\u9020\u6210\u989d\u5916\u5ef6\u8fdf\u4e0e\u4e22\u5305\u3002<\/li>\n<li><strong>\u4e22\u5305\u4e0e\u91cd\u4f20\uff1a<\/strong>\u4e22\u5305\u4f1a\u89e6\u53d1TCP\/UDP\u91cd\u4f20\u6216\u5e94\u7528\u5c42\u7684\u91cd\u8bd5\u673a\u5236\uff0c\u4f7f\u5f97\u6709\u6548\u5ef6\u8fdf\u663e\u8457\u4e0a\u5347\u3002<\/li>\n<li><strong>\u4e3b\u673a\u8d44\u6e90\u4e0e\u865a\u62df\u5316\u5f00\u9500\uff1a<\/strong>CPU\u3001\u7f51\u7edc\u4e2d\u65ad\uff08IRQ\uff09\u5904\u7406\u3001\u865a\u62df\u5316\u6280\u672f\uff08KVM\u3001OpenVZ\u3001Hyper-V\uff09\u7684\u6027\u80fd\u5dee\u5f02\u4e5f\u4f1a\u5f71\u54cd\u7f51\u7edc\u5ef6\u8fdf\u3002<\/li>\n<li><strong>\u5185\u6838\u4e0eTCP\u6808\u914d\u7f6e\uff1a<\/strong>\u9ed8\u8ba4\u5185\u6838\u53c2\u6570\u5e76\u975e\u9488\u5bf9\u9ad8\u5e76\u53d1\u6e38\u620f\u573a\u666f\u4f18\u5316\uff0c\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u3001\u7f13\u51b2\u533a\u5c3a\u5bf8\u3001TIME-WAIT\u5904\u7406\u7b49\u90fd\u4f1a\u5de6\u53f3\u5ef6\u8fdf\u8868\u73b0\u3002<\/li>\n<\/ul>\n<h2>\u5e94\u7528\u573a\u666f\u5206\u6790\uff1a\u9999\u6e2fVPS\u9002\u5408\u54ea\u4e9b\u73a9\u5bb6\u4e0e\u670d\u52a1<\/h2>\n<p>\u5728\u51b3\u5b9a\u662f\u5426\u5728\u9999\u6e2f\u90e8\u7f72\u6e38\u620f\u670d\u52a1\u5668\u65f6\uff0c\u5e94\u8003\u8651\u76ee\u6807\u73a9\u5bb6\u7684\u5730\u7406\u5206\u5e03\u4e0e\u4e1a\u52a1\u9700\u6c42\uff1a<\/p>\n<ul>\n<li>\u9762\u5411\u4e2d\u56fd\u5927\u9646\u3001\u9999\u6e2f\u3001\u53f0\u6e7e\u548c\u4e1c\u5357\u4e9a\u73a9\u5bb6\u7684\u5b9e\u65f6\u7ade\u4e89\u7c7b\u6e38\u620f\uff0c\u9009\u62e9\u9999\u6e2f\u670d\u52a1\u5668\u53ef\u4ee5\u83b7\u5f97\u8f83\u4f4e\u7684\u8de8\u5883\u65f6\u5ef6\u3002<\/li>\n<li>\u82e5\u7528\u6237\u4ee5\u5317\u7f8e\u4e3a\u4e3b\uff0c\u5efa\u8bae\u8003\u8651\u7f8e\u56fdVPS\u6216\u7f8e\u56fd\u670d\u52a1\u5668\uff0c\u4ee5\u51cf\u5c11\u8de8\u592a\u5e73\u6d0b\u65f6\u5ef6\u3002<\/li>\n<li>\u5bf9\u5168\u7403\u73a9\u5bb6\u7684MMO\u6216\u5927\u578bPvE\u7c7b\u6e38\u620f\uff0c\u53ef\u4ee5\u8003\u8651\u591a\u533a\u57df\u90e8\u7f72\u5e76\u7ed3\u5408CDN\/\u667a\u80fd\u8c03\u5ea6\u3002<\/li>\n<\/ul>\n<h2>6\u6b65\u5b9e\u6218\u4f18\u5316\u6d41\u7a0b\uff08\u8be6\u7ec6\u914d\u7f6e\u4e0e\u5de5\u5177\uff09<\/h2>\n<p>\u4e0b\u9762\u7ed9\u51fa\u53ef\u64cd\u4f5c\u76846\u6b65\u6d41\u7a0b\uff0c\u6bcf\u4e00\u6b65\u90fd\u5305\u542b\u5177\u4f53\u547d\u4ee4\u3001\u914d\u7f6e\u601d\u8def\u548c\u9a8c\u8bc1\u65b9\u6cd5\u3002<\/p>\n<h3>\u6b65\u9aa41\uff1a\u7cbe\u786e\u8bca\u65ad \u2014 \u4f7f\u7528Traceroute\u3001MTR\u548ctcpdump<\/h3>\n<p>\u5148\u4e0d\u8981\u76f2\u76ee\u8c03\u6574\uff0c\u5148\u8bca\u65ad\u7f51\u7edc\u8def\u5f84\u4e0e\u4e22\u5305\u70b9\u3002<\/p>\n<ul>\n<li>mtr -rwzbc100 target_ip\uff1a\u6301\u7eed\u89c2\u5bdf\u6bcf\u8df3\u5ef6\u8fdf\u4e0e\u4e22\u5305\u7387\uff0c\u5b9a\u4f4d\u74f6\u9888\u8df3\u70b9\u3002<\/li>\n<li>traceroute -n target_ip\uff08\u6216traceroute -I \u4f7f\u7528ICMP\uff09\uff1a\u5bf9\u6bd4ICMP\u4e0eUDP\u8def\u7531\u5dee\u5f02\u3002<\/li>\n<li>tcpdump -i eth0 host target_ip and icmp\uff1a\u6293\u5305\u67e5\u770b\u662f\u5426\u5b58\u5728\u5947\u602a\u7684\u91cd\u4f20\u6216ICMP\u56de\u590d\u5f02\u5e38\u3002<\/li>\n<\/ul>\n<p>\u8bca\u65ad\u7ed3\u679c\u4f1a\u544a\u77e5\u95ee\u9898\u5728\u94fe\u8def\u4e2d\u95f4\uff08\u9700\u8054\u7cfb\u5e26\u5bbd\u63d0\u4f9b\u65b9\u6216\u4e0a\u6e38\uff09\u8fd8\u662f\u5728VPS\u4e3b\u673a\u7aef\uff08\u53ef\u901a\u8fc7\u4e0b\u9762\u6b65\u9aa4\u4f18\u5316\uff09\u3002<\/p>\n<h3>\u6b65\u9aa42\uff1a\u4f18\u5316\u5185\u6838\u7f51\u7edc\u53c2\u6570\u4e0e\u62e5\u585e\u63a7\u5236<\/h3>\n<p>\u9488\u5bf9Linux\u670d\u52a1\u5668\uff08\u591a\u6570VPS\uff09\uff0c\u8c03\u6574sysctl\u53c2\u6570\u4e0e\u91c7\u7528\u73b0\u4ee3\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\uff08\u5982BBR\uff09\u80fd\u663e\u8457\u51cf\u5c11\u5ef6\u8fdf\u548c\u4e22\u5305\uff1a<\/p>\n<ul>\n<li>\u542f\u7528BBR\uff08\u5982\u679c\u5185\u6838\u7248\u672c\u652f\u6301\uff09\uff1aecho &#8220;net.ipv4.tcp_congestion_control=bbr&#8221; &gt;&gt; \/etc\/sysctl.conf<\/li>\n<li>\u589e\u52a0socket\u7f13\u51b2\u533a\uff1anet.core.rmem_max\u3001net.core.wmem_max\u3001net.ipv4.tcp_rmem\u3001net.ipv4.tcp_wmem<\/li>\n<li>\u51cf\u5c11TIME_WAIT\u5806\u79ef\uff1anet.ipv4.tcp_tw_reuse=1\u3001net.ipv4.tcp_tw_recycle=0\uff08\u6ce8\u610f\u5b89\u5168\u6027\uff09<\/li>\n<li>\u5f00\u542fSACK\u3001Timestamps\u4ee5\u53ca\u8c03\u4f18RTO\/HZ\u503c\u4ee5\u63d0\u5347\u5c0f\u5305\u54cd\u5e94\uff1anet.ipv4.tcp_sack=1\u3001net.ipv4.tcp_timestamps=1<\/li>\n<\/ul>\n<p>\u5e94\u7528\u540e\u901a\u8fc7ss -s\u3001netstat -s\u548c\u89c2\u5bdf\u5e94\u7528\u5c42\u5ef6\u8fdf\u6765\u9a8c\u8bc1\u6548\u679c\u3002<\/p>\n<h3>\u6b65\u9aa43\uff1aMTU\u4e0e\u5206\u7247\u4f18\u5316<\/h3>\n<p>\u4e0d\u5408\u9002\u7684MTU\u4f1a\u5bfc\u81f4\u5206\u7247\u4e0e\u91cd\u7ec4\uff0c\u589e\u52a0\u5ef6\u8fdf\u5e76\u5f15\u53d1\u4e22\u5305\u3002\u5e38\u89c1\u505a\u6cd5\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528ping -M do -s  target_ip \u627e\u5230\u4e0d\u53d1\u751f\u5206\u7247\u7684\u6700\u5927MTU\u3002<\/li>\n<li>\u5728Linux\u4e0a\u8bbe\u7f6e\u5408\u9002\u7684MTU\uff1aip link set dev eth0 mtu 1500\uff08\u6216\u7ecf\u8fc7\u6d4b\u8bd5\u7684\u6700\u4f73\u503c\uff09\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a\u5f53\u4f7f\u7528GRE\u3001IPsec\u6216\u67d0\u4e9b\u96a7\u9053\u6280\u672f\u65f6\uff0c\u9700\u8981\u51cf\u5c0fMTU\u4ee5\u907f\u514d\u5206\u7247\u3002<\/p>\n<h3>\u6b65\u9aa44\uff1a\u7f51\u5361\u4e0e\u4e2d\u65ad\u4eb2\u548c\uff08IRQ affinity\uff09\u4f18\u5316<\/h3>\n<p>\u5728\u591a\u6838\u865a\u62df\u673a\u6216\u88f8\u91d1\u5c5e\u4e0a\uff0c\u5408\u7406\u7ed1\u5b9a\u4e2d\u65ad\u4e0eCPU\u53ef\u4ee5\u964d\u4f4e\u4e2d\u65ad\u5ef6\u8fdf\uff1a<\/p>\n<ul>\n<li>\u67e5\u770b\u4e2d\u65ad\uff1acat \/proc\/interrupts<\/li>\n<li>\u8bbe\u7f6eirqbalance\u6216\u624b\u52a8\u901a\u8fc7echo\u8bbe\u7f6esmp_affinity_mask\u5c06\u9ad8\u6d41\u91cf\u7f51\u5361\u4e2d\u65ad\u5206\u914d\u5230\u9ad8\u901fCPU\u6838\u3002<\/li>\n<li>\u542f\u7528\u6216\u8c03\u4f18RSS\uff08Receive Side Scaling\uff09\u4e0eLRO\/GRO\uff1aethtool -K eth0 gro on lro off\uff08\u6839\u636e\u5e94\u7528\u6d4b\u8bd5\u5f00\u542f\u6216\u5173\u95edLRO\/Large Receive 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