{"id":29971,"date":"2026-04-02T10:00:00","date_gmt":"2026-04-02T02:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=29971"},"modified":"2026-04-08T12:58:31","modified_gmt":"2026-04-08T04:58:31","slug":"us-vps-high-latency-troubleshooting-tcp-optimization","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/guides\/us-vps-high-latency-troubleshooting-tcp-optimization\/","title":{"rendered":"\u7f8e\u56fd VPS \u5ef6\u8fdf\u9ad8\u600e\u4e48\u529e\uff1a\u56de\u7a0b\u7ebf\u8def\u8bca\u65ad\u4e0e TCP \u4f18\u5316\u5b8c\u6574\u6307\u5357"},"content":{"rendered":"<p><img decoding=\"async\" alt=\"\u7f8e\u56fd VPS \u670d\u52a1\u5668\u5ef6\u8fdf\u8bca\u65ad\u4e0e\u4f18\u5316\u5c01\u9762\u56fe\uff0c\u5c55\u793a\u6570\u636e\u4e2d\u5fc3\u670d\u52a1\u5668\u4e0e\u8de8\u6d0b\u7f51\u7edc\u8def\u7ebf\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/04\/us-vps-high-latency-troubleshooting-tcp-optimization-cover.webp\" \/><\/p>\n<p><em>\u56fe\u89e3\u7f8e\u56fd <a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS<\/a> \u56de\u7a0b\u7ebf\u8def\u8bca\u65ad\u4e0e TCP \u53c2\u6570\u4f18\u5316\u7684\u6838\u5fc3\u6982\u5ff5<\/em><\/p>\n<h2>\u95ee\u9898\u573a\u666f\uff1a\u4e3a\u4ec0\u4e48\u7f8e\u56fd VPS \u8bbf\u95ee\u901f\u5ea6\u6162<\/h2>\n<p>\u5982\u679c\u4f60\u8fd0\u8425\u9762\u5411\u56fd\u5185\u7528\u6237\u7684\u7f51\u7ad9\u6216\u5e94\u7528\uff0c\u9009\u62e9\u7f8e\u56fd VPS\uff08<a href=\"https:\/\/cn.hostease.com\/vps\/\">\u865a\u62df\u4e13\u7528\u670d\u52a1\u5668<\/a>\uff09\u65f6\u7ecf\u5e38\u4f1a\u9047\u5230 ping \u503c\u4e0d\u9ad8\u4f46\u5b9e\u9645\u8bbf\u95ee\u901f\u5ea6\u5f88\u6162\u7684\u95ee\u9898\u3002\u8fd9\u79cd\u73b0\u8c61\u7684\u6838\u5fc3\u539f\u56e0\u5f80\u5f80\u4e0d\u662f\u53bb\u7a0b\u7ebf\u8def\uff0c\u800c\u662f<strong>\u56de\u7a0b\u7ebf\u8def\u8d28\u91cf<\/strong>\u548c<strong>TCP \u53c2\u6570\u914d\u7f6e<\/strong>\u3002<\/p>\n<p>\u672c\u6587\u6559\u4f60\u5982\u4f55\u8bca\u65ad\u56de\u7a0b\u7ebf\u8def\u95ee\u9898\uff0c\u5e76\u901a\u8fc7 TCP \u53c2\u6570\u4f18\u5316\u6765\u6539\u5584\u8bbf\u95ee\u901f\u5ea6\u3002<\/p>\n<h2>\u7406\u89e3\u7f51\u7edc\u5ef6\u8fdf\u7684\u6784\u6210<\/h2>\n<h3>\u53bb\u7a0b\u4e0e\u56de\u7a0b\u7684\u5dee\u5f02<\/h3>\n<p>\u5f53\u4f60\u4ece\u56fd\u5185\u8bbf\u95ee\u7f8e\u56fd VPS \u65f6\uff0c\u6570\u636e\u5305\u9700\u8981\u5b8c\u6210\u4e00\u4e2a\u5f80\u8fd4\u65c5\u7a0b\uff1a\u53bb\u7a0b\u662f\u56fd\u5185\u5ba2\u6237\u7aef\u5230\u7f8e\u56fd VPS\uff0c\u56de\u7a0b\u662f\u7f8e\u56fd VPS \u5230\u56fd\u5185\u5ba2\u6237\u7aef\u3002<\/p>\n<p>\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u53bb\u7a0b\u7ebf\u8def\u7ecf\u8fc7\u4f18\u5316\uff08\u5982 CN2 GIA\u3001CUVIP \u7b49\uff09\uff0cping \u503c\u53ef\u4ee5\u63a7\u5236\u5728 120-150ms\u3002\u4f46\u56de\u7a0b\u7ebf\u8def\u5f80\u5f80\u8d70\u516c\u5171\u4e92\u8054\u7f51\uff0c\u53ef\u80fd\u7ed5\u9053\u6b27\u6d32\u6216\u4e1c\u5357\u4e9a\uff0c\u5bfc\u81f4\u5b9e\u9645\u5ef6\u8fdf\u8fbe\u5230 200-300ms \u751a\u81f3\u66f4\u9ad8\u3002<\/p>\n<h3>\u5ef6\u8fdf\u7684\u7ec4\u6210\u8981\u7d20<\/h3>\n<p>\u603b\u5ef6\u8fdf = \u7269\u7406\u4f20\u64ad\u5ef6\u8fdf + \u8def\u7531\u8df3\u6570\u5ef6\u8fdf + \u62e5\u585e\u6392\u961f\u5ef6\u8fdf + TCP \u63e1\u624b\u5ef6\u8fdf<\/p>\n<ul>\n<li><strong>\u7269\u7406\u4f20\u64ad\u5ef6\u8fdf<\/strong>\uff1a\u5149\u5728\u5149\u7ea4\u4e2d\u7684\u4f20\u64ad\u901f\u5ea6\u51b3\u5b9a\uff0c\u65e0\u6cd5\u4f18\u5316<\/li>\n<li><strong>\u8def\u7531\u8df3\u6570\u5ef6\u8fdf<\/strong>\uff1a\u7ecf\u8fc7\u7684\u8def\u7531\u5668\u6570\u91cf\uff0c\u6bcf\u8df3\u589e\u52a0 1-5ms<\/li>\n<li><strong>\u62e5\u585e\u6392\u961f\u5ef6\u8fdf<\/strong>\uff1a\u94fe\u8def\u62e5\u585e\u65f6\u6570\u636e\u5305\u6392\u961f\u7b49\u5f85\uff0c\u6ce2\u52a8\u6700\u5927<\/li>\n<li><strong>TCP \u63e1\u624b\u5ef6\u8fdf<\/strong>\uff1a\u5efa\u7acb\u8fde\u63a5\u6240\u9700\u7684\u4e09\u6b21\u63e1\u624b\u65f6\u95f4<\/li>\n<\/ul>\n<p>\u6211\u4eec\u5efa\u8bae\u7684\u505a\u6cd5\u662f\uff1a\u5148\u6d4b\u91cf\u5404\u73af\u8282\u5ef6\u8fdf\uff0c\u518d\u9488\u5bf9\u6027\u4f18\u5316\u3002<\/p>\n<p><img decoding=\"async\" alt=\"\u53bb\u7a0b\u4e0e\u56de\u7a0b\u7f51\u7edc\u8def\u5f84\u5bf9\u6bd4\u56fe\uff0c\u5de6\u4fa7\u663e\u793a\u76f4\u63a5\u8def\u5f84 120ms\uff0c\u53f3\u4fa7\u663e\u793a\u7ed5\u9053\u8def\u5f84 280ms\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/04\/us-vps-high-latency-troubleshooting-tcp-optimization-network-path.webp\" \/><\/p>\n<p><em>\u53bb\u7a0b\u7ebf\u8def\u4f18\u5316\u4f46\u56de\u7a0b\u7ed5\u9053\u5bfc\u81f4\u5b9e\u9645\u5ef6\u8fdf\u589e\u52a0<\/em><\/p>\n<h2>\u7b2c\u4e00\u6b65\uff1a\u8bca\u65ad\u56de\u7a0b\u7ebf\u8def\u8d28\u91cf<\/h2>\n<h3>\u4f7f\u7528 MTR \u6d4b\u8bd5\u8def\u7531\u8def\u5f84<\/h3>\n<p>MTR\uff08My Traceroute\uff09\u7ed3\u5408\u4e86 ping \u548c traceroute \u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u663e\u793a\u6bcf\u4e00\u8df3\u7684\u5ef6\u8fdf\u548c\u4e22\u5305\u7387\u3002<\/p>\n<pre><code class=\"language-bash\">apt-get install mtr -y\nmtr -rwC 100 -c 100 \u76ee\u6807 IP\n<\/code><\/pre>\n<p><strong>\u8bc6\u522b\u95ee\u9898\u8282\u70b9\u7684\u65b9\u6cd5<\/strong>\uff1a<\/p>\n<ol>\n<li><strong>\u4e22\u5305\u7387\u7a81\u589e<\/strong>\uff1a\u67d0\u4e00\u8df3\u4e22\u5305\u8d85\u8fc7 5%\uff0c\u8bf4\u660e\u8be5\u8282\u70b9\u62e5\u585e<\/li>\n<li><strong>\u5ef6\u8fdf\u8df3\u53d8<\/strong>\uff1a\u76f8\u90bb\u4e24\u8df3\u5ef6\u8fdf\u589e\u52a0\u8d85\u8fc7 50ms\uff0c\u8bf4\u660e\u7ed5\u8def\u6216\u62e5\u585e<\/li>\n<li><strong>\u6301\u7eed\u9ad8\u5ef6\u8fdf<\/strong>\uff1a\u4ece\u67d0\u8df3\u5f00\u59cb\u540e\u7eed\u6240\u6709\u8282\u70b9\u5ef6\u8fdf\u90fd\u9ad8\uff0c\u8bf4\u660e\u8be5\u8df3\u662f\u74f6\u9888<\/li>\n<\/ol>\n<h3>\u4f7f\u7528 BestTrace \u8bc6\u522b\u7ebf\u8def\u7c7b\u578b<\/h3>\n<pre><code class=\"language-bash\">wget https:\/\/cdn.ipip.net\/17mon\/besttrace4linux.zip\nunzip besttrace4linux.zip\nchmod +x besttrace\n.\/besttrace \u76ee\u6807 IP\n<\/code><\/pre>\n<p><strong>\u7ebf\u8def\u7c7b\u578b\u5224\u65ad<\/strong>\uff1a<\/p>\n<ul>\n<li><strong>CN2 GIA<\/strong>\uff1a\u663e\u793a&#8221;\u7535\u4fe1 CN2&#8243;<\/li>\n<li><strong>169 \u7ebf\u8def<\/strong>\uff1a\u663e\u793a&#8221;Level3&#8243;\u3001&#8221;NTT&#8221;\u7b49\uff0c\u8d70\u516c\u5171\u4e92\u8054\u7f51<\/li>\n<li><strong>CUVIP<\/strong>\uff1a\u663e\u793a&#8221;\u8054\u901a CUII&#8221;<\/li>\n<\/ul>\n<p>\u5982\u679c\u56de\u7a0b\u8d70 169 \u7ebf\u8def\uff0c\u5ef6\u8fdf\u548c\u4e22\u5305\u90fd\u4f1a\u6bd4\u8f83\u660e\u663e\u3002<\/p>\n<h3>\u4f7f\u7528 TCPing \u6d4b\u8bd5\u5b9e\u9645\u8fde\u63a5\u5ef6\u8fdf<\/h3>\n<pre><code class=\"language-bash\">tcping -t \u76ee\u6807 IP 80\ntcping -t \u76ee\u6807 IP 443\n<\/code><\/pre>\n<p>\u5982\u679c ping \u5ef6\u8fdf 150ms\uff0cTCPing \u5ef6\u8fdf 200ms+\uff0c\u8bf4\u660e TCP \u63e1\u624b\u6216 TLS \u63e1\u624b\u6709\u989d\u5916\u5f00\u9500\u3002<\/p>\n<h2>\u7b2c\u4e8c\u6b65\uff1a\u4f18\u5316 TCP \u53c2\u6570<\/h2>\n<h3>\u4fee\u6539 TCP \u62e5\u585e\u63a7\u5236\u7b97\u6cd5<\/h3>\n<p><strong>\u67e5\u770b\u5f53\u524d\u7b97\u6cd5<\/strong>\uff1a<\/p>\n<pre><code class=\"language-bash\">sysctl net.ipv4.tcp_congestion_control\n<\/code><\/pre>\n<p><strong>\u5e38\u89c1\u7b97\u6cd5\u5bf9\u6bd4<\/strong>\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u7b97\u6cd5<\/th>\n<th>\u9002\u7528\u573a\u666f<\/th>\n<th>\u7279\u70b9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>cubic<\/td>\n<td>\u9ed8\u8ba4\u7b97\u6cd5<\/td>\n<td>\u9ad8\u901f\u7f51\u7edc\u8868\u73b0\u597d<\/td>\n<\/tr>\n<tr>\n<td>bbr<\/td>\n<td>\u63a8\u8350<\/td>\n<td>\u9002\u5408\u9ad8\u5ef6\u8fdf\u3001\u6709\u4e22\u5305\u7684\u94fe\u8def<\/td>\n<\/tr>\n<tr>\n<td>reno<\/td>\n<td>\u4f20\u7edf\u7b97\u6cd5<\/td>\n<td>\u4fdd\u5b88\uff0c\u9002\u5408\u7a33\u5b9a\u7f51\u7edc<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u542f\u7528 BBR \u7b97\u6cd5<\/strong>\uff08\u63a8\u8350\uff09\uff1a<\/p>\n<pre><code class=\"language-bash\">echo &quot;net.core.default_qdisc=fq&quot; &gt;&gt; \/etc\/sysctl.conf\necho &quot;net.ipv4.tcp_congestion_control=bbr&quot; &gt;&gt; \/etc\/sysctl.conf\nsysctl -p\n<\/code><\/pre>\n<p>BBR \u901a\u8fc7\u6301\u7eed\u6d4b\u91cf\u7f51\u7edc\u4f20\u8f93\u80fd\u529b\u548c\u5f80\u8fd4\u65f6\u95f4\u6765\u4f18\u5316\u53d1\u9001\u901f\u7387\uff0c\u7279\u522b\u9002\u5408\u8de8\u6d0b\u9ad8\u5ef6\u8fdf\u94fe\u8def\u3002\u5b9e\u9645\u6d4b\u8bd5\u4e2d\uff0cBBR \u53ef\u4ee5\u5c06\u541e\u5410\u91cf\u63d0\u5347 20-50%\u3002<\/p>\n<h3>\u8c03\u6574 TCP \u7f13\u51b2\u533a\u5927\u5c0f<\/h3>\n<pre><code class=\"language-bash\">net.ipv4.tcp_rmem = 4096 87380 67108864\nnet.ipv4.tcp_wmem = 4096 65536 67108864\nnet.core.rmem_max = 67108864\nnet.core.wmem_max = 67108864\nnet.ipv4.tcp_window_scaling = 1\nnet.ipv4.tcp_sack = 1\nsysctl -p\n<\/code><\/pre>\n<h3>\u4f18\u5316 TCP \u8fde\u63a5\u590d\u7528<\/h3>\n<p><strong>\u542f\u7528 TCP Fast Open<\/strong>\uff1a<\/p>\n<pre><code class=\"language-bash\">echo &quot;net.ipv4.tcp_fastopen = 3&quot; &gt;&gt; \/etc\/sysctl.conf\nsysctl -p\n<\/code><\/pre>\n<p>TCP Fast Open \u5141\u8bb8\u5728\u4e09\u6b21\u63e1\u624b\u671f\u95f4\u53d1\u9001\u6570\u636e\uff0c\u53ef\u4ee5\u51cf\u5c11\u4e00\u4e2a\u5f80\u8fd4\u65f6\u95f4\u7684\u5ef6\u8fdf\u3002<\/p>\n<h2>\u7b2c\u4e09\u6b65\uff1a\u5e94\u7528\u5c42\u4f18\u5316\u5efa\u8bae<\/h2>\n<h3>\u542f\u7528 HTTP\/2<\/h3>\n<p>HTTP\/2 \u7684\u591a\u8def\u590d\u7528\u7279\u6027\u53ef\u4ee5\u51cf\u5c11\u8fde\u63a5\u5efa\u7acb\u6b21\u6570\u3002<\/p>\n<pre><code class=\"language-nginx\">server {\n    listen 443 ssl http2;\n    server_name example.com;\n}\n<\/code><\/pre>\n<h3>\u914d\u7f6e CDN \u52a0\u901f<\/h3>\n<p>CDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u53ef\u4ee5\u5c06\u9759\u6001\u8d44\u6e90\u7f13\u5b58\u5230\u79bb\u7528\u6237\u66f4\u8fd1\u7684\u8282\u70b9\u3002\u66f4\u591a\u5173\u4e8e CDN \u4f18\u5316\u7684\u5185\u5bb9\uff0c\u53ef\u4ee5\u53c2\u8003\u6211\u4eec\u7684 <a href=\"https:\/\/cn.hostease.com\/blog\/guides\/cross-border-dns-optimization-authoritative-ttl-multi-line\/\">\u8de8\u5883\u4e1a\u52a1 DNS \u89e3\u6790\u6162\u4f18\u5316\uff1a\u6743\u5a01 DNS\u3001TTL \u4e0e\u591a\u7ebf\u8def\u670d\u52a1\u5668\u8c03\u5ea6<\/a>\u3002\u5982\u679c\u4f60\u7684 VPS \u8fd8\u5b58\u5728 CPU \u6216\u5185\u5b58\u7684\u6027\u80fd\u74f6\u9888\uff0c\u53ef\u4ee5\u53c2\u8003 <a href=\"https:\/\/cn.hostease.com\/blog\/guides\/ecommerce-server-cpu-spike-troubleshooting-guide\/\">\u7535\u5546\u7f51\u7ad9\u670d\u52a1\u5668 CPU \u6253\u6ee1\u6392\u67e5\uff1aNginx\u3001PHP-FPM \u4e0e MySQL \u8054\u8c03<\/a> \u505a\u7efc\u5408\u6392\u67e5\u3002<\/p>\n<p><strong>CDN \u9009\u578b\u5efa\u8bae<\/strong>\uff1aCloudflare\uff08\u514d\u8d39\u5957\u9910\uff0c\u5168\u7403\u8282\u70b9\u591a\uff09\u3001\u963f\u91cc\u4e91 CDN\uff08\u56fd\u5185\u8282\u70b9\u591a\uff09\u3002<\/p>\n<h3>\u4f18\u5316 SSL \u63e1\u624b<\/h3>\n<p>SSL\uff08\u5b89\u5168\u5957\u63a5\u5c42\uff09\u63e1\u624b\u662f HTTPS \u5ef6\u8fdf\u7684\u91cd\u8981\u6765\u6e90\u3002<\/p>\n<pre><code class=\"language-nginx\">ssl_protocols TLSv1.2 TLSv1.3;\nssl_session_cache shared:SSL:10m;\n<\/code><\/pre>\n<h2>\u7b2c\u56db\u6b65\uff1a\u6301\u7eed\u76d1\u63a7<\/h2>\n<p>\u4f18\u5316\u5b8c\u6210\u540e\uff0c\u5efa\u7acb\u76d1\u63a7\u57fa\u7ebf\u5e76\u8bbe\u7f6e\u544a\u8b66\u3002\u78c1\u76d8 IO \u7684\u6301\u7eed\u6296\u52a8\u540c\u6837\u4f1a\u52a0\u5267\u54cd\u5e94\u5ef6\u8fdf\uff0c\u5efa\u8bae\u540c\u6b65\u53c2\u8003 <a href=\"https:\/\/cn.hostease.com\/blog\/guides\/vps-disk-io-jitter-storage-baseline-performance\/\">VPS \u670d\u52a1\u5668\u78c1\u76d8 IO \u6296\u52a8\u5904\u7406\uff1a\u5b58\u50a8\u57fa\u7ebf\u6d4b\u8bd5\u4e0e\u4e3b\u673a\u6027\u80fd\u6cbb\u7406<\/a> \u5efa\u7acb\u5b8c\u6574\u7684\u6027\u80fd\u57fa\u7ebf\uff1a<\/p>\n<ul>\n<li><strong>\u5ef6\u8fdf\u544a\u8b66<\/strong>\uff1aping \u503c\u6301\u7eed\u8d85\u8fc7 200ms<\/li>\n<li><strong>\u4e22\u5305\u544a\u8b66<\/strong>\uff1a\u4e22\u5305\u7387\u8d85\u8fc7 5%<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u76d1\u63a7\u5de5\u5177\uff08\u5982 Uptime Robot\u3001Pingdom\uff09\u6301\u7eed\u8ffd\u8e2a\u5ef6\u8fdf\u3001\u4e22\u5305\u7387\u548c\u54cd\u5e94\u65f6\u95f4\u3002<\/p>\n<h2>\u5e38\u89c1\u95ee\u9898\u89e3\u7b54<\/h2>\n<h3>Q1\uff1a\u4f18\u5316\u540e\u5ef6\u8fdf\u6ca1\u6709\u660e\u663e\u6539\u5584\uff0c\u600e\u4e48\u529e\uff1f<\/h3>\n<p>\u53ef\u80fd\u539f\u56e0\uff1a\u7269\u7406\u8ddd\u79bb\u9650\u5236\uff08\u4e2d\u7f8e\u7ea6 120-140ms\uff09\u3001\u8fd0\u8425\u5546\u4e92\u8054\u62e5\u585e\u3001VPS \u6027\u80fd\u4e0d\u8db3\u3002<\/p>\n<p><strong>\u5efa\u8bae<\/strong>\uff1a\u8003\u8651\u66f4\u6362\u5230\u9999\u6e2f\u3001\u65e5\u672c\u3001\u65b0\u52a0\u5761\u7b49\u66f4\u8fd1\u5730\u533a\u3002<\/p>\n<h3>Q2\uff1aBBR \u7b97\u6cd5\u6709\u4ec0\u4e48\u526f\u4f5c\u7528\u5417\uff1f<\/h3>\n<p>BBR \u53ef\u80fd\u5728\u62e5\u585e\u65f6\u5360\u7528\u8fc7\u591a\u7f51\u7edc\u8d44\u6e90\uff0c\u4e14\u9700\u8981 Linux 4.9+ \u5185\u6838\u3002\u5efa\u8bae\u5148\u5728\u6d4b\u8bd5\u73af\u5883\u9a8c\u8bc1\u3002<\/p>\n<h3>Q3\uff1a\u5982\u4f55\u5224\u65ad\u662f\u5426\u9700\u8981\u66f4\u6362 VPS \u670d\u52a1\u5546\uff1f<\/h3>\n<p>\u5982\u679c\u51fa\u73b0\u4ee5\u4e0b\u60c5\u51b5\uff0c\u5efa\u8bae\u8003\u8651\u66f4\u6362\uff1a\u56de\u7a0b\u6301\u7eed\u8d70 169 \u7ebf\u8def\u3001\u9ad8\u5cf0\u671f\u4e22\u5305\u7387\u8d85\u8fc7 10%\u3001\u5ef6\u8fdf\u6301\u7eed\u8d85\u8fc7 300ms\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u9009\u62e9\u63d0\u4f9b CN2 GIA\u3001CUVIP \u7b49\u4f18\u5316\u7ebf\u8def\u7684\u670d\u52a1\u5546\u3002\u66f4\u591a\u5173\u4e8e VPS \u914d\u7f6e\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u67e5\u770b\u6211\u4eec\u7684 <a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS \u4e3b\u673a\u9875\u9762<\/a>\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u7f8e\u56fd VPS \u5ef6\u8fdf\u9ad8\u7684\u6838\u5fc3\u539f\u56e0\u662f\u56de\u7a0b\u7ebf\u8def\u8d28\u91cf\u548c TCP 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