{"id":208832,"date":"2025-09-29T22:34:29","date_gmt":"2025-09-29T14:34:29","guid":{"rendered":"https:\/\/www.server.hk\/blog\/208832\/"},"modified":"2025-09-29T22:34:30","modified_gmt":"2025-09-29T14:34:30","slug":"vps-121","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208832\/","title":{"rendered":"\u9999\u6e2fVPS\u8fde\u63a5\u6162\uff1f7\u4e2a\u5b9e\u7528\u6392\u67e5\u4e0e\u63d0\u901f\u6280\u5de7"},"content":{"rendered":"<p>\u5728\u9999\u6e2f\u90e8\u7f72VPS\u56e0\u5176\u5730\u7406\u4f4d\u7f6e\u4f18\u8d8a\u3001\u5230\u4e2d\u56fd\u5927\u9646\u548c\u4e1c\u5357\u4e9a\u7684\u7f51\u7edc\u5ef6\u8fdf\u8f83\u4f4e\uff0c\u5e38\u88ab\u7ad9\u957f\u548c\u4f01\u4e1a\u9009\u7528\u3002\u7136\u800c\u5b9e\u9645\u4f7f\u7528\u8fc7\u7a0b\u4e2d\uff0c\u8bb8\u591a\u7528\u6237\u4f1a\u9047\u5230\u201c\u8fde\u63a5\u6162\u3001\u4e22\u5305\u9ad8\u3001\u4e0b\u8f7d\/\u4e0a\u4f20\u901f\u7387\u8fbe\u4e0d\u5230\u6807\u79f0\u5e26\u5bbd\u201d\u7b49\u95ee\u9898\u3002\u672c\u6587\u4ece\u7f51\u7edc\u539f\u7406\u3001\u6392\u67e5\u5de5\u5177\u4e0e\u5b9e\u64cd\u6280\u5de7\u5165\u624b\uff0c\u7ed9\u51fa\u7cfb\u7edf\u5316\u76847\u4e2a\u6392\u67e5\u4e0e\u63d0\u901f\u65b9\u6cd5\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u548c\u8fd0\u7ef4\u5feb\u901f\u5b9a\u4f4d\u74f6\u9888\u5e76\u6062\u590d\u7406\u60f3\u6027\u80fd\u3002<\/p>\n<h2>\u4e3a\u4f55\u4f1a\u51fa\u73b0\u201c\u8fde\u63a5\u6162\u201d\u2014\u2014\u7f51\u7edc\u6027\u80fd\u7684\u5173\u952e\u56e0\u7d20<\/h2>\n<p>\u7406\u89e3\u95ee\u9898\u9996\u5148\u8981\u628a\u7f51\u7edc\u62c6\u89e3\u4e3a\u51e0\u5c42\uff1a\u7269\u7406\u94fe\u8def\uff08\u8fd0\u8425\u5546\u9aa8\u5e72\u4e0e\u672c\u5730\u63a5\u5165\uff09\u3001\u8def\u7531\u8f6c\u53d1\uff08BGP\u3001AS\u8def\u7531\u7b56\u7565\uff09\u3001\u94fe\u8def\u8d28\u91cf\uff08\u4e22\u5305\u3001\u6296\u52a8\u3001MTU\uff09\u3001\u4e3b\u673a\u914d\u7f6e\uff08TCP\u6808\u3001\u961f\u5217\u8c03\u5ea6\u3001\u9a71\u52a8\uff09\u4ee5\u53ca\u5e94\u7528\u5c42\uff08\u5e76\u53d1\u8fde\u63a5\u3001TLS\u63e1\u624b\u3001DNS\u89e3\u6790\uff09\u3002\u4efb\u4e00\u5c42\u51fa\u73b0\u95ee\u9898\u90fd\u4f1a\u5bf9\u6700\u7ec8\u4f53\u9a8c\u4ea7\u751f\u660e\u663e\u5f71\u54cd\u3002<\/p>\n<h3>\u5e38\u89c1\u7684\u6280\u672f\u6210\u56e0<\/h3>\n<ul>\n<li>\u8de8\u5883\u94fe\u8def\u4e22\u5305\u6216ISP\u7b56\u7565\u9650\u901f\uff0c\u5bfc\u81f4RTT\u589e\u5927\u4e0eTCP\u541e\u5410\u4e0b\u964d\u3002<\/li>\n<li>\u8def\u5f84MTU\u4e0d\u5339\u914d\u5bfc\u81f4\u5206\u7247\u6216PMTU\u53d1\u73b0\u5931\u8d25\uff0c\u5f71\u54cd\u5927\u5305\u4f20\u8f93\u6548\u7387\u3002<\/li>\n<li>\u9ed8\u8ba4TCP\u62e5\u585e\u63a7\u5236\u4e0e\u7a97\u53e3\u8bbe\u7f6e\u672a\u4f18\u5316\uff0c\u77ed\u94fe\u63a5\u4e0e\u9ad8\u5ef6\u8fdf\u573a\u666f\u4e0b\u9891\u7e41\u89e6\u53d1\u6162\u542f\u52a8\u3002<\/li>\n<li>VPS\u5bbf\u4e3b\u673a\u6216\u865a\u62df\u5316\u7f51\u7edc\uff08vSwitch\u3001SR-IOV \u672a\u914d\u7f6e\uff09\u9020\u6210\u7684IO\u74f6\u9888\u3002<\/li>\n<li>\u9632\u706b\u5899\u6216QoS\u7b56\u7565\u5bf9\u7279\u5b9a\u7aef\u53e3\/\u534f\u8bae\uff08\u5982P2P\u3001VPN\uff09\u6709\u9650\u5236\u3002<\/li>\n<li>DNS\u89e3\u6790\u6162\u6216\u88ab\u52ab\u6301\uff0c\u9996\u6b21\u8fde\u63a5\u65f6\u5ef6\u663e\u8457\u589e\u52a0\u3002<\/li>\n<\/ul>\n<h2>7\u4e2a\u5b9e\u7528\u6392\u67e5\u4e0e\u63d0\u901f\u6280\u5de7\uff08\u542b\u547d\u4ee4\u4e0e\u53c2\u6570\u7ea7\u5efa\u8bae\uff09<\/h2>\n<h3>1. \u4f7f\u7528\u7f51\u7edc\u8bca\u65ad\u5de5\u5177\u5b9a\u4f4d\u74f6\u9888<\/h3>\n<p>\u5148\u7528\u6700\u57fa\u7840\u7684\u5de5\u5177\u786e\u8ba4\u5ef6\u8fdf\u4e0e\u4e22\u5305\uff1a<\/p>\n<ul>\n<li>ping -c 50 x.x.x.x\uff1a\u89c2\u5bdfRTT\u5206\u5e03\u4e0e\u4e22\u5305\u3002<\/li>\n<li>mtr -c 100 x.x.x.x\uff1a\u540c\u65f6\u83b7\u5f97\u8def\u5f84\u4e0a\u6bcf\u4e00\u8df3\u7684\u5ef6\u8fdf\u4e0e\u4e22\u5305\uff0c\u5b9a\u4f4d\u662f\u54ea\u4e00\u6bb5\u94fe\u8def\u51fa\u73b0\u95ee\u9898\u3002<\/li>\n<li>traceroute -T\/-U\uff1aTCP\/UDP \u8def\u7531\u8ffd\u8e2a\uff0c\u6709\u52a9\u5224\u65ad\u9632\u706b\u5899\u5728\u4f55\u5904\u4e22\u5305\u3002<\/li>\n<li>iperf3 -c server -P 4\uff1a\u6d4b\u91cf\u5e26\u5bbd\u4e0a\u884c\/\u4e0b\u884c\u5e76\u53d1\u541e\u5410\uff0c\u6ce8\u610f\u4f7f\u7528\u591a\u6d41(-P)\u8bc4\u4f30TCP\u5e76\u53d1\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p>\u6839\u636e\u8fd9\u4e9b\u7ed3\u679c\u53ef\u4ee5\u5224\u65ad\u662f\u94fe\u8def\u95ee\u9898\u8fd8\u662f\u4e3b\u673a\u7aef\u74f6\u9888\u3002<\/p>\n<h3>2. \u68c0\u67e5MTU\u4e0e\u5206\u7247\u95ee\u9898<\/h3>\n<p>\u8de8\u5883\u94fe\u8def\u901a\u5e38\u4f1a\u89e6\u53caPMTU\u95ee\u9898\u3002\u5efa\u8bae\u5728VPS\u4e0a\u6d4b\u8bd5\u6700\u5927\u53ef\u7528MTU\uff1a<\/p>\n<ul>\n<li>ping -M do -s 1472 target\uff08Linux\uff09\uff1a\u9010\u6b65\u51cf\u5c0fpayload\uff0c\u627e\u5230\u4e0d\u5206\u7247\u7684\u6700\u5927\u503c\u3002<\/li>\n<li>\u5982\u53d1\u73b0PMTU\u5c0f\u4e8e1500\uff0c\u8003\u8651\u5728VPS\u7f51\u7edc\u63a5\u53e3\u8bbe\u7f6e\u5408\u9002\u7684MTU\uff1aip link set dev eth0 mtu 1400\uff0c\u5e76\u5728\u5e94\u7528\u5c42\u8c03\u6574TCP MSS\uff1aiptables &#8211;clamp-mss-to-pmtu\u3002<\/li>\n<\/ul>\n<h3>3. \u4f18\u5316Linux TCP\u6808\u4e0e\u62e5\u585e\u63a7\u5236<\/h3>\n<p>\u5bf9\u9ad8\u5ef6\u8fdf\u94fe\u8def\uff08\u5982\u5230\u7f8e\u56fdVPS\u6216\u8de8\u592a\u5e73\u6d0b\u94fe\u8def\uff09\u53ef\u901a\u8fc7\u8c03\u4f18\u63d0\u9ad8\u541e\u5410\uff1a<\/p>\n<ul>\n<li>\u542f\u7528BBR\u62e5\u585e\u63a7\u5236\uff08Linux &gt;=4.9\uff09\uff1asysctl -w net.ipv4.tcp_congestion_control=bbr\uff1b\u67e5\u770b\uff1asysctl net.ipv4.tcp_available_congestion_control\u3002<\/li>\n<li>\u589e\u5927TCP\u7a97\u53e3\u4e0e\u7f13\u51b2\u533a\uff1anet.core.rmem_max\u3001net.core.wmem_max\u3001net.ipv4.tcp_rmem\u3001net.ipv4.tcp_wmem\u3002<\/li>\n<li>\u5f00\u542fTCP Fast Open\u548c\u7a97\u53e3\u7f29\u653e\uff1anet.ipv4.tcp_fastopen\u3001net.ipv4.tcp_window_scaling\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u8c03\u4f18\u5bf9\u5927\u6587\u4ef6\u4f20\u8f93\u6216\u9ad8\u5ef6\u8fdf\u591a\u5e26\u5bbd\u573a\u666f\u7279\u522b\u6709\u6548\u3002<\/p>\n<h3>4. \u6392\u67e5\u865a\u62df\u5316\/\u5bbf\u4e3b\u673a\u4e0e\u7f51\u5361\u9a71\u52a8\u95ee\u9898<\/h3>\n<p>VPS\u7684\u7f51\u7edc\u6027\u80fd\u53ef\u80fd\u53d7\u5bbf\u4e3b\u673aNIC\u914d\u7f6e\u4e0e\u865a\u62df\u5316\u7f51\u7edc\u6a21\u578b\u5f71\u54cd\uff1a<\/p>\n<ul>\n<li>\u786e\u8ba4\u662f\u5426\u4f7f\u7528SR-IOV\u6216PCI\u76f4\u901a\uff08\u53ef\u663e\u8457\u964d\u4f4e\u5ef6\u8fdf\u4e0e\u4e2d\u65ad\u5f00\u9500\uff09\u3002<\/li>\n<li>\u5728VPS\u4e0a\u67e5\u770b\u7f51\u5361\u7edf\u8ba1\uff1aethtool -S eth0\u3001ethtool -k eth0\uff0c\u4e86\u89e3offload\u662f\u5426\u5f00\u542f\uff08GRO\/LRO\/TSO\uff09\u3002<\/li>\n<li>\u82e5\u51fa\u73b0\u5927\u91cftx\/rx\u9519\u8bef\u6216drops\uff0c\u8054\u7cfb\u670d\u52a1\u5546\u68c0\u67e5\u5bbf\u4e3b\u673a\u94fe\u8def\u6216\u66f4\u6362\u865a\u62df\u5316\u5b9e\u4f8b\u3002<\/li>\n<\/ul>\n<h3>5. \u6df1\u5165\u6293\u5305\u5206\u6790\u5e94\u7528\u5c42\u5ef6\u8fdf<\/h3>\n<p>\u4f7f\u7528tcpdump\u4e0eWireshark\u5b9a\u4f4d\u63e1\u624b\u4e0e\u91cd\u4f20\uff1a<\/p>\n<ul>\n<li>tcpdump -i eth0 port 443 -w capture.pcap\uff1a\u6293\u53d6TLS\u8fde\u63a5\u5168\u8fc7\u7a0b\u3002<\/li>\n<li>\u5728\u6293\u5305\u4e2d\u67e5\u770bSYN\/ACK\u5ef6\u8fdf\u3001\u91cd\u4f20\u6b21\u6570\u4e0eRTO\uff0c\u5224\u65ad\u662f\u5426\u4e3a\u7f51\u7edc\u4e22\u5305\u5bfc\u81f4\u7684\u5ef6\u8fdf\u653e\u5927\u3002<\/li>\n<li>\u5e94\u7528\u5c42\uff08\u5982HTTP\/HTTPS\uff09\u89c2\u5bdfTLS\u63e1\u624b\u65f6\u95f4\u3001\u8bc1\u4e66\u94fe\u4e0b\u8f7d\u3001OCSP\/CRL\u5ef6\u8fdf\u7b49\u3002<\/li>\n<\/ul>\n<h3>6. \u4f18\u5316DNS\u4e0e\u8fde\u63a5\u5efa\u7acb\u7b56\u7565<\/h3>\n<p>\u6162\u89e3\u6790\u4f1a\u653e\u5927\u9996\u5305\u5ef6\u8fdf\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u53ef\u9760\u7684DNS\u89e3\u6790\uff08\u6bd4\u5982\u90e8\u7f72\u672c\u5730\u7f13\u5b58dnsmasq\uff0c\u6216\u4f7f\u7528CDN\/Anycast DNS\uff09\u3002<\/li>\n<li>\u5bf9\u591a\u57df\u540d\u8d44\u6e90\u5f00\u542f\u5e76\u53d1DNS\u67e5\u8be2\u4e0e\u8fde\u63a5\u590d\u7528\uff08HTTP\/2\u6216HTTP\/3\uff09\u3002<\/li>\n<li>\u5bf9\u9700\u8981\u8de8\u533a\u57df\u8bbf\u95ee\u7684\u670d\u52a1\uff0c\u8003\u8651\u5728\u9999\u6e2f\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\u4e0a\u90e8\u7f72\u8fb9\u7f18\u5b9e\u4f8b\uff0c\u5e76\u4f7f\u7528\u667a\u80fdDNS\u6216GeoDNS\u505a\u6d41\u91cf\u5206\u53d1\u3002<\/li>\n<\/ul>\n<h3>7. \u8003\u8651\u4f7f\u7528\u52a0\u901f\/\u4e2d\u7ee7\u6216\u8c03\u6574\u90e8\u7f72\u7b56\u7565<\/h3>\n<p>\u5728\u4e00\u4e9b\u573a\u666f\u4e0b\uff0c\u7f51\u7edc\u5c42\u9762\u65e0\u6cd5\u5b8c\u5168\u89e3\u51b3\u95ee\u9898\uff0c\u9700\u4f7f\u7528\u67b6\u6784\u624b\u6bb5\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528TCP\/UDP\u52a0\u901f\u5668\u6216\u4e13\u7ebf\uff08SD-WAN\u3001MPLS\uff09\u6539\u5584\u8de8\u5883\u94fe\u8def\u8d28\u91cf\u3002<\/li>\n<li>\u82e5\u4e3b\u8981\u7528\u6237\u5728\u4e2d\u56fd\u5927\u9646\u6216\u4e1c\u5357\u4e9a\uff0c\u4f18\u5148\u8003\u8651\u9999\u6e2fVPS\u6216\u9999\u6e2f\u670d\u52a1\u5668\u4ee5\u51cf\u5c11\u7269\u7406\u5ef6\u8fdf\uff1b\u82e5\u4e3b\u8981\u7528\u6237\u5728\u7f8e\u6d32\u5219\u9009\u62e9\u7f8e\u56fdVPS\u6216\u7f8e\u56fd\u670d\u52a1\u5668\u66f4\u5408\u9002\u3002<\/li>\n<li>\u5bf9\u4e8e\u9759\u6001\u8d44\u6e90\u5efa\u8bae\u90e8\u7f72CDN\uff0c\u52a8\u6001\u4e1a\u52a1\u8003\u8651\u667a\u80fd\u8def\u7531\u6216\u591a\u6d3b\u90e8\u7f72\u4ee5\u964d\u4f4e\u5355\u70b9\u7f51\u7edc\u6ce2\u52a8\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<h2>\u5e94\u7528\u573a\u666f\u4e0e\u4f18\u52bf\u5bf9\u6bd4\uff1a\u9999\u6e2fVPS \u4e0e 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vs 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