{"id":33224,"date":"2026-09-23T10:00:00","date_gmt":"2026-09-23T02:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=33224"},"modified":"2026-09-28T22:28:20","modified_gmt":"2026-09-28T14:28:20","slug":"ssh-server","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/guides\/ssh-server\/","title":{"rendered":"SSH \u7aef\u53e3\u6572\u95e8\u914d\u7f6e\uff1a\u628a\u7ba1\u7406\u7aef\u53e3\u85cf\u8d77\u6765\u7684\u670d\u52a1\u5668\u52a0\u56fa\u6280\u5de7"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/09\/ssh-server-cover.webp\" alt=\"SSH \u7aef\u53e3\u6572\u95e8\u914d\u7f6e\u5c01\u9762\u914d\u56fe\" loading=\"lazy\" \/><\/p>\n<p>\u53ea\u8981\u670d\u52a1\u5668\u8fde\u63a5\u516c\u7f51\uff0c\u9ed8\u8ba4\u7684 SSH \u7aef\u53e3\u6bcf\u5929\u90fd\u4f1a\u906d\u9047\u6210\u5343\u4e0a\u4e07\u6b21\u6076\u610f\u626b\u63cf\u4e0e\u5bc6\u7801\u66b4\u529b\u7834\u89e3\u3002\u54ea\u6015\u4f60\u628a\u9ed8\u8ba4\u7684 22 \u7aef\u53e3\u6539\u6210\u4e94\u4f4d\u6570\u7684\u9ad8\u4f4d\u7aef\u53e3\uff0c\u4f7f\u7528\u5168\u7f51\u626b\u63cf\u5de5\u5177\u7684\u653b\u51fb\u8005\u4e5f\u80fd\u5728\u6570\u5206\u949f\u5185\u63a2\u77e5\u5176\u5f00\u653e\u72b6\u6001\u3002\u8fd9\u7bc7\u6587\u7ae0\u5c06\u4e3a\u4f60\u63d0\u4f9b\u4e00\u4efd\u6e05\u6670\u5b9e\u7528\u7684 SSH \u7aef\u53e3\u6572\u95e8\uff08Port Knocking\uff09\u914d\u7f6e\u6307\u5357\uff0c\u5e2e\u52a9\u4f60\u901a\u8fc7 knockd \u5b88\u62a4\u8fdb\u7a0b\u5c06 SSH \u7ba1\u7406\u7aef\u53e3\u5f7b\u5e95\u9690\u85cf\u5728\u9632\u706b\u5899\u4e4b\u540e\uff0c\u53ea\u5bf9\u638c\u63e1\u6b63\u786e\u6572\u95e8\u6697\u53f7\u7684\u7ec8\u7aef\u52a8\u6001\u653e\u884c\uff0c\u4ece\u6e90\u5934\u4e0a\u89e3\u51b3\u7ba1\u7406\u7aef\u53e3\u66b4\u9732\u4e0e\u626b\u63cf\u9a9a\u6270\u96be\u9898\u3002<\/p>\n<h2>\u7aef\u53e3\u6572\u95e8\u7684\u5e95\u5c42\u903b\u8f91\uff1a\u4ece\u88ab\u52a8\u66b4\u9732\u5230\u52a8\u6001\u5f00\u95e8<\/h2>\n<p>\u5728\u4f20\u7edf\u7684 Linux \u670d\u52a1\u5668\u5b89\u5168\u52a0\u56fa\u4e2d\uff0c\u5e38\u89c1\u505a\u6cd5\u662f\u4fee\u6539 SSH \u7aef\u53e3\u6216\u90e8\u7f72\u9632\u7206\u7834\u5de5\u5177\u3002\u4f46\u65e0\u8bba\u5c06\u7aef\u53e3\u6539\u4e3a\u4ec0\u4e48\uff0c\u53ea\u8981\u9632\u706b\u5899\u5bf9\u5916\u5904\u4e8e\u653e\u884c\u72b6\u6001\uff0c\u653b\u51fb\u8005\u4f7f\u7528 Masscan \u6216 Zmap \u7b49\u5168\u7f51\u626b\u63cf\u5668\u5c31\u80fd\u5728\u6781\u77ed\u65f6\u95f4\u5185\u626b\u51fa\u5f00\u653e\u7aef\u53e3\u3002\u53ea\u8981\u6536\u5230 SYN-ACK \u56de\u5305\uff0cSSH \u670d\u52a1\u5c31\u5df2\u5728\u516c\u7f51\u4e0a\u663e\u9732\u3002<\/p>\n<p>\u7aef\u53e3\u6572\u95e8\uff08Port Knocking\uff09\u63d0\u4f9b\u4e86\u4e00\u79cd\u622a\u7136\u4e0d\u540c\u7684\u9632\u5fa1\u601d\u8def\uff1a\u8ba9\u7ba1\u7406\u7aef\u53e3\u5bf9\u5916\u8868\u73b0\u4e3a\u5f7b\u5e95\u7684\u4e22\u5f03\uff08DROP\uff09\u72b6\u6001\u3002\u5728\u672a\u6388\u6743\u7684\u63a2\u6d4b\u8005\u773c\u4e2d\uff0c\u670d\u52a1\u5668\u6ca1\u6709\u4efb\u4f55\u7ba1\u7406\u7aef\u53e3\u5bf9\u5916\u5f00\u653e\u3002\u53ea\u6709\u5f53\u5408\u6cd5\u8fd0\u7ef4\u4eba\u5458\u4f9d\u7167\u9884\u8bbe\u7684\u6697\u53f7\u987a\u5e8f\uff0c\u5411\u670d\u52a1\u5668\u53d1\u9001\u4e00\u7ec4\u7279\u5b9a\u7aef\u53e3\u7684\u5fae\u91cf\u6570\u636e\u5305\u540e\uff0c\u670d\u52a1\u5668\u5185\u90e8\u7684\u76d1\u542c\u7a0b\u5e8f\u624d\u4f1a\u8bc6\u522b\u51fa\u8be5\u5e8f\u5217\uff0c\u5e76\u5728\u5e95\u5c42\u9632\u706b\u5899\u4e2d\u4e34\u65f6\u4e3a\u8be5\u5ba2\u6237\u7aef IP \u6253\u5f00\u4e00\u6761\u653e\u884c\u901a\u9053\u3002<\/p>\n<p>\u8fd9\u5957\u673a\u5236\u5e76\u4e0d\u4f9d\u8d56 TCP \u63e1\u624b\u670d\u52a1\uff0c\u800c\u662f\u501f\u52a9 libpcap \u6293\u5305\u5e93\u5de5\u4f5c\u3002knockd \u5b88\u62a4\u8fdb\u7a0b\u4ee5\u9759\u9ed8\u6a21\u5f0f\u6302\u8f7d\u5728\u6307\u5b9a\u7f51\u7edc\u63a5\u53e3\u4e0a\uff0c\u65c1\u8def\u6355\u83b7\u6d41\u5165\u7f51\u5361\u7684\u539f\u59cb\u6570\u636e\u5305\u5934\u3002\u5373\u4f7f\u64cd\u4f5c\u7cfb\u7edf\u9632\u706b\u5899\u4e22\u5f03\u4e86\u53d1\u5f80\u5173\u95ed\u7aef\u53e3\u7684\u62a5\u6587\uff0cknockd \u4ecd\u80fd\u5728\u5e95\u5c42\u6355\u83b7\u8fd9\u4e9b SYN \u6216 UDP \u5305\u7684\u6e90 IP\u3001\u76ee\u7684\u7aef\u53e3\u4e0e\u65f6\u95f4\u6233\u3002\u5f53\u68c0\u6d4b\u5230\u67d0\u4e2a\u6765\u6e90 IP \u5728\u9650\u5b9a\u65f6\u95f4\u7a97\u53e3\u5185\u4f9d\u6b21\u547d\u4e2d\u9884\u5b9a\u5e8f\u5217\uff08\u5982\u5148\u8bbf\u95ee 7381\/TCP\uff0c\u518d\u8bbf\u95ee 8912\/UDP\uff0c\u6700\u540e\u8bbf\u95ee 9425\/TCP\uff09\uff0cknockd \u5c31\u4f1a\u6267\u884c\u9884\u8bbe\u7684\u9632\u706b\u5899\u547d\u4ee4\u52a8\u6001\u653e\u884c\u3002\u5173\u4e8e\u7f51\u7edc\u6570\u636e\u5305\u6d41\u52a8\u4e0e\u9632\u706b\u5899\u89c4\u5219\u94fe\u7684\u5e95\u5c42\u673a\u5236\uff0c\u4e5f\u53ef\u4ee5\u53c2\u8003\u6211\u4eec\u5728<a href=\"https:\/\/cn.hostease.com\/blog\/server\/\">\u670d\u52a1\u5668\u57fa\u7840\u680f\u76ee<\/a>\u4e2d\u7684\u76f8\u5173\u89e3\u6790\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/09\/ssh-server-mechanism.webp\" alt=\"\u7aef\u53e3\u6572\u95e8\u5e8f\u5217\u8bc6\u522b\u4e0e\u9632\u706b\u5899\u52a8\u6001\u653e\u884c\u6d41\u7a0b\u56fe\" loading=\"lazy\" \/><\/p>\n<h2>\u5b9e\u6218\u90e8\u7f72\uff1a\u670d\u52a1\u7aef knockd \u4e0e\u9632\u706b\u5899\u8054\u52a8\u914d\u7f6e<\/h2>\n<p>\u5c06\u7aef\u53e3\u6572\u95e8\u843d\u5730\u5230\u751f\u4ea7\u73af\u5883\uff0c\u4e3b\u8981\u7531\u7ba1\u7406\u901a\u9053\u4fdd\u969c\u3001knockd \u670d\u52a1\u7aef\u914d\u7f6e\u4e0e\u9632\u706b\u5899\u57fa\u7ebf\u6536\u7d27\u4e09\u4e2a\u9636\u6bb5\u6784\u6210\u3002<\/p>\n<h3>\u5173\u952e\u524d\u7f6e\u51c6\u5907\uff1a\u907f\u514d\u5c06\u81ea\u5df1\u9501\u5728\u95e8\u5916<\/h3>\n<p>\u5728\u8c03\u6574\u6d89\u53ca\u963b\u65ad SSH \u7684\u9632\u706b\u5899\u7b56\u7565\u524d\uff0c\u5197\u4f59\u901a\u9053\u662f\u5fc5\u987b\u505a\u597d\u7684\u5e95\u7ebf\u4fdd\u969c\u3002\u7531\u4e8e\u7aef\u53e3\u6572\u95e8\u4f9d\u8d56\u4e25\u683c\u7684\u9ed8\u8ba4\u4e22\u5f03\u7b56\u7565\uff0c\u4e00\u65e6\u914d\u7f6e\u8bed\u6cd5\u9519\u8bef\u3001\u5b88\u62a4\u8fdb\u7a0b\u672a\u968f\u7cfb\u7edf\u542f\u52a8\u6216\u89c4\u5219\u51b2\u7a81\uff0c\u4f60\u53ef\u80fd\u4f1a\u77ac\u95f4\u4e22\u5931\u8fdc\u7a0b\u8fde\u63a5\u3002<\/p>\n<p>\u56e0\u6b64\u5728\u52a8\u624b\u524d\uff0c\u52a1\u5fc5\u786e\u4fdd\u62e5\u6709\u53ef\u7528\u7684\u5e26\u5916\u7ba1\u7406\u901a\u9053\u3002\u4f8b\u5982\u5728 <a href=\"https:\/\/cn.hostease.com\/vps.html\">Hostease VPS \u4e91\u4e3b\u673a<\/a> \u6216\u7ba1\u7406\u9762\u677f\u4e2d\uff0c\u63d0\u524d\u9a8c\u8bc1\u5e76\u6253\u5f00\u7f51\u9875\u7aef VNC \u6216\u7d27\u6025\u63a7\u5236\u53f0\uff0c\u786e\u8ba4\u53ef\u901a\u8fc7\u63a7\u5236\u53f0\u767b\u5f55\u3002\u540c\u65f6\u5728\u672c\u5730\u4fdd\u6301\u4e00\u4e2a\u73b0\u5b58\u7684 SSH \u4f1a\u8bdd\u7a97\u53e3\u4e0d\u8981\u65ad\u5f00\uff0c\u4ee5\u4fbf\u5728\u6572\u95e8\u672a\u751f\u6548\u65f6\u5373\u65f6\u6392\u67e5\u3002<\/p>\n<h3>\u5b89\u88c5\u4e0e\u914d\u7f6e knockd \u5b88\u62a4\u8fdb\u7a0b<\/h3>\n<p>\u5728 Ubuntu \u6216 Debian \u7cfb\u7edf\u4e2d\u76f4\u63a5\u901a\u8fc7 APT \u5b89\u88c5\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\nsudo apt update && sudo apt install -y knockd\n<\/pre>\n<p>\u5728 AlmaLinux\u3001Rocky Linux \u6216 CentOS \u73af\u5883\u4e2d\uff0c\u5148\u542f\u7528 EPEL \u8f6f\u4ef6\u6e90\u518d\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\nsudo dnf install -y epel-release && sudo dnf install -y knock-server\n<\/pre>\n<p>\u5b89\u88c5\u5b8c\u6210\u540e\u7f16\u8f91 \/etc\/knockd.conf \u6587\u4ef6\u3002\u751f\u4ea7\u73af\u5883\u4e2d\u5efa\u8bae\u6311\u9009 3 \u5230 4 \u4e2a\u65e0\u56fa\u5b9a\u4e1a\u52a1\u5360\u7528\u7684\u975e\u8fde\u7eed\u9ad8\u4f4d\u7aef\u53e3\uff0c\u5e76\u6df7\u5408\u4f7f\u7528 TCP \u4e0e UDP \u534f\u8bae\uff0c\u4ee5\u9632\u5e38\u89c4\u7aef\u53e3\u626b\u63cf\u610f\u5916\u89e6\u53d1\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\n[options]\n    UseSyslog\n    Interface = eth0\n\n[opencloseSSH]\n    sequence      = 7381:tcp,8912:udp,9425:tcp\n    seq_timeout   = 15\n    tcpflags      = syn\n    start_command = \/usr\/sbin\/iptables -I INPUT -s %IP% -p tcp --dport 22 -j ACCEPT\n    cmd_timeout   = 25\n    stop_command  = \/usr\/sbin\/iptables -D INPUT -s %IP% -p tcp --dport 22 -j ACCEPT\n<\/pre>\n<p>\u4e0a\u8ff0\u914d\u7f6e\u4e2d\u5404\u5173\u952e\u53c2\u6570\u7684\u542b\u4e49\u5982\u4e0b\uff1a<br \/>\n&#8211; Interface\uff1a\u6307\u5b9a\u76d1\u542c\u7684\u7f51\u5361\u540d\u79f0\uff08\u5982 eth0\uff0c\u53ef\u7528 ip addr \u786e\u8ba4\uff09\u3002<br \/>\n&#8211; sequence\uff1a\u6572\u95e8\u7aef\u53e3\u53ca\u534f\u8bae\u5e8f\u5217\u3002<br \/>\n&#8211; seq_timeout\uff1a\u5b8c\u6210\u5168\u5957\u6572\u95e8\u64cd\u4f5c\u7684\u6709\u6548\u65f6\u95f4\u7a97\u53e3\uff0c\u6b64\u5904\u8bbe\u4e3a 15 \u79d2\u3002<br \/>\n&#8211; start_command\uff1a\u9a8c\u8bc1\u6210\u529f\u540e\u6267\u884c\u7684\u547d\u4ee4\uff0c%IP% \u4f1a\u81ea\u52a8\u66ff\u6362\u4e3a\u6572\u95e8\u6765\u6e90\u4e3b\u673a\u7684\u516c\u7f51 IP\u3002<br \/>\n&#8211; cmd_timeout \u4e0e stop_command\uff1a\u5f00\u95e8\u540e\u7684\u4fdd\u6d3b\u65f6\u957f\u3002\u6b64\u5904\u8bbe\u4e3a 25 \u79d2\uff0c\u4ee3\u8868\u6572\u95e8\u6210\u529f\u540e\u4f60\u6709 25 \u79d2\u65f6\u95f4\u5efa\u7acb SSH \u8fde\u63a5\uff1b\u8d85\u65f6\u540e\u81ea\u52a8\u79fb\u9664\u89c4\u5219\u3002\u7531\u4e8e\u5185\u6838\u5177\u5907\u8fde\u63a5\u8ddf\u8e2a\u673a\u5236\uff0c\u5df2\u5efa\u7acb\u7684 SSH \u4f1a\u8bdd\u4e0d\u53d7\u5173\u95e8\u5f71\u54cd\u3002<\/p>\n<p>\u5728 Debian\/Ubuntu \u4e2d\uff0c\u8fd8\u9700\u7f16\u8f91 \/etc\/default\/knockd \u5c06 START_KNOCKD \u8bbe\u4e3a 1\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\nsudo sed -i 's\/START_KNOCKD=0\/START_KNOCKD=1\/' \/etc\/default\/knockd\nsudo systemctl enable --now knockd\nsudo systemctl status knockd\n<\/pre>\n<h3>\u521d\u59cb\u5316\u9632\u706b\u5899\u9ed8\u8ba4\u963b\u65ad\u7b56\u7565<\/h3>\n<p>\u5b88\u62a4\u8fdb\u7a0b\u542f\u52a8\u540e\uff0c\u5bf9\u9632\u706b\u5899 INPUT \u94fe\u65bd\u52a0\u9ed8\u8ba4\u9632\u5fa1\u7b56\u7565\u3002\u5fc5\u987b\u4e25\u683c\u9075\u5faa\u201c\u5148\u4fdd\u969c\u5df2\u5efa\u7acb\u8fde\u63a5\uff0c\u518d\u963b\u65ad\u9ed8\u8ba4 SSH\u201d\u7684\u539f\u5219\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\nsudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT\nsudo iptables -A INPUT -p tcp --dport 22 -j DROP\nsudo iptables -L INPUT -v -n\n<\/pre>\n<p>\u6b64\u65f6\u5728\u53e6\u4e00\u53f0\u672a\u6572\u95e8\u7684\u5916\u90e8\u673a\u5668\u4e0a\u7528 nmap \u626b\u63cf\u8be5\u670d\u52a1\u5668\u7684 22 \u7aef\u53e3\uff0c\u72b6\u6001\u5e94\u663e\u793a\u4e3a filtered\uff0c\u8bf4\u660e\u7aef\u53e3\u9690\u85cf\u5df2\u7ecf\u751f\u6548\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/09\/ssh-server-config-flow.webp\" alt=\"\u670d\u52a1\u7aef knockd \u8fd0\u884c\u72b6\u6001\u4e0e\u914d\u7f6e\u6267\u884c\u6d41\u7a0b\u56fe\" loading=\"lazy\" \/><\/p>\n<h2>\u5ba2\u6237\u7aef\u8fde\u63a5\u4e0e\u6392\u9519\uff1a\u6572\u95e8\u59ff\u52bf\u4e0e\u4e22\u5305\u81ea\u6551<\/h2>\n<p>\u670d\u52a1\u7aef\u90e8\u7f72\u5b8c\u6210\u540e\uff0c\u5ba2\u6237\u7aef\u65e2\u53ef\u4ee5\u4f7f\u7528\u4e13\u7528\u5de5\u5177\uff0c\u4e5f\u53ef\u4ee5\u5229\u7528\u539f\u751f\u547d\u4ee4\u6784\u5efa\u8f7b\u91cf\u5316\u6572\u95e8\u65b9\u6848\u3002<\/p>\n<h3>\u5ba2\u6237\u7aef\u53d1\u8d77\u6572\u95e8\u7684\u5e38\u7528\u65b9\u5f0f<\/h3>\n<p>\u6700\u76f4\u63a5\u7684\u65b9\u5f0f\u662f\u5728\u672c\u5730\u5ba2\u6237\u7aef\u5b89\u88c5 knock \u5de5\u5177\u5e76\u53d1\u9001\u6572\u95e8\u5e8f\u5217\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\nknock 198.51.100.1 7381:tcp 8912:udp 9425:tcp\nssh user@198.51.100.1\n<\/pre>\n<p>\u82e5\u5728\u65e0\u5b89\u88c5\u6743\u9650\u7684\u7ec8\u7aef\u4e0a\uff0c\u53ef\u5229\u7528 Linux \u6216 macOS \u539f\u751f\u81ea\u5e26\u7684 nc\uff08Netcat\uff09\u5355\u884c\u547d\u4ee4\u5b8c\u6210\u6572\u95e8\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\nnc -z -w 1 198.51.100.1 7381 && nc -u -z -w 1 198.51.100.1 8912 && nc -z -w 1 198.51.100.1 9425 && ssh user@198.51.100.1\n<\/pre>\n<p>\u4e3a\u4e86\u65e5\u5e38\u8fd0\u7ef4\u66f4\u9ad8\u6548\uff0c\u53ef\u4ee5\u5728\u672c\u5730 ~\/.ssh\/config \u4e2d\u5229\u7528 ProxyCommand \u81ea\u52a8\u6267\u884c\u6572\u95e8\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\nHost my-secure-server\n    HostName 198.51.100.1\n    User admin\n    Port 22\n    ProxyCommand bash -c 'knock %h 7381:tcp 8912:udp 9425:tcp && sleep 1 && nc %h %p'\n<\/pre>\n<p>\u4fdd\u5b58\u540e\u76f4\u63a5\u8f93\u5165 ssh my-secure-server \u5373\u53ef\u81ea\u52a8\u6572\u95e8\u5e76\u5efa\u7acb\u8fde\u63a5\u3002<\/p>\n<h3>\u7f51\u7edc\u6296\u52a8\u4e0e\u4e22\u5305\u6392\u9519<\/h3>\n<p>\u5728\u5b9e\u9645\u8de8\u7f51\u6bb5\u8fde\u63a5\u4e2d\uff0c\u7aef\u53e3\u6572\u95e8\u53ef\u80fd\u9047\u5230\u4e24\u7c7b\u5178\u578b\u6311\u6218\uff1a<\/p>\n<ul>\n<li>\u8de8\u7f51\u4f20\u8f93\u4e22\u5305\u5bfc\u81f4\u65f6\u5e8f\u7d0a\u4e71\uff1a\u7aef\u53e3\u6572\u95e8\u5bf9\u6570\u636e\u5305\u7684\u63a5\u6536\u987a\u5e8f\u8981\u6c42\u4e25\u82db\u3002\u82e5\u79fb\u52a8\u7f51\u7edc\u6216\u8de8\u57df\u94fe\u8def\u51fa\u73b0\u4e22\u5305\u4e0e\u91cd\u4f20\u4e71\u5e8f\uff0cknockd \u65e0\u6cd5\u62fc\u88c5\u51fa\u5b8c\u6574\u5e8f\u5217\u3002\u6392\u67e5\u65f6\u53ef\u5728\u670d\u52a1\u7aef\u5b9e\u65f6\u67e5\u770b\u65e5\u5fd7\uff1a<\/li>\n<\/ul>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-linenumbers=\"false\">\nsudo journalctl -u knockd -f\n<\/pre>\n<p>\u82e5\u65e5\u5fd7\u663e\u793a\u4ec5\u6355\u83b7\u4e86\u90e8\u5206\u6572\u95e8\u8bb0\u5f55\uff0c\u53ef\u9002\u5f53\u5c06 knockd.conf \u4e2d\u7684 seq_timeout \u653e\u5bbd\u81f3 30 \u79d2\u3002<\/p>\n<ul>\n<li>\u591a\u8bbe\u5907\u5171\u4eab\u516c\u7f51\u51fa\u53e3 NAT\uff1a\u5728\u5c40\u57df\u7f51\u4e2d\u6240\u6709\u5185\u7f51\u4e3b\u673a\u4f1a\u5171\u7528\u540c\u4e00\u4e2a\u516c\u7f51 IP \u51fa\u53e3\u3002\u82e5 knockd \u653e\u884c\u4e86\u8be5 %IP%\uff0c\u610f\u5473\u7740\u540c\u4e00\u51fa\u53e3\u4e0b\u7684\u5176\u4ed6\u8bbe\u5907\u5728\u5173\u95e8\u524d\u4e5f\u80fd\u5c1d\u8bd5\u53d1\u8d77 SSH \u8fde\u63a5\u3002\u8fd9\u8868\u660e\u7aef\u53e3\u6572\u95e8\u53ea\u8d1f\u8d23\u9690\u85cf\u5165\u53e3\uff0c\u4e0d\u80fd\u4f5c\u4e3a\u8eab\u4efd\u6838\u9a8c\u7684\u552f\u4e00\u51ed\u8bc1\u3002\u5bf9\u4e8e\u7ba1\u7406\u591a\u4e1a\u52a1\u7ad9\u70b9\u7684\u7ad9\u957f\uff08\u5982\u6211\u4eec\u5728 <a href=\"https:\/\/cn.hostease.com\/blog\/wordpress\/\">WordPress \u8fd0\u7ef4\u680f\u76ee<\/a> \u4e2d\u63a2\u8ba8\u7684\u5efa\u7ad9\u73af\u5883\uff09\uff0c\u5165\u53e3\u9690\u853d\u5fc5\u987b\u4e0e\u5e95\u5c42\u5f3a\u8ba4\u8bc1\u6df1\u5ea6\u914d\u5408\u3002<\/li>\n<\/ul>\n<h2>\u9632\u5fa1\u7eb5\u6df1\uff1a\u4e3a\u4ec0\u4e48\u6572\u95e8\u4e0d\u80fd\u66ff\u4ee3\u5bc6\u94a5\u8ba4\u8bc1\u4e0e Fail2ban<\/h2>\n<p>\u5728\u7f51\u7edc\u5b89\u5168\u4e2d\uff0c\u7aef\u53e3\u6572\u95e8\u5c5e\u4e8e\u5178\u578b\u7684\u201c\u6df7\u6dc6\u9632\u5fa1\u201d\uff08Security through Obscurity\uff09\u3002\u5b83\u7684\u6838\u5fc3\u4ef7\u503c\u5728\u4e8e\u5927\u5e45\u6d88\u9664\u516c\u7f51\u626b\u63cf\u566a\u58f0\uff0c\u4f46\u5176\u672c\u8eab\u5e76\u4e0d\u5177\u5907\u5bc6\u7801\u5b66\u610f\u4e49\u4e0a\u7684\u8eab\u4efd\u9274\u6743\u80fd\u529b\u3002<\/p>\n<p>\u9996\u5148\uff0c\u6572\u95e8\u6570\u636e\u5305\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u4e3a\u660e\u6587\u62a5\u6587\u3002\u5982\u679c\u7f51\u7edc\u94fe\u8def\u4e2d\u95f4\u8282\u70b9\u5b58\u5728\u55c5\u63a2\uff0c\u653b\u51fb\u8005\u7406\u8bba\u4e0a\u53ef\u4ee5\u901a\u8fc7\u6d41\u91cf\u5206\u6790\u8fd8\u539f\u6572\u95e8\u5e8f\u5217\u3002\u5176\u6b21\uff0c\u7531\u4e8e\u9632\u706b\u5899\u57fa\u4e8e\u6765\u6e90 IP \u8fdb\u884c\u52a8\u6001\u653e\u884c\uff0c\u540c\u4e00 NAT \u5c40\u57df\u7f51\u4e0b\u7684\u5176\u4ed6\u6076\u610f\u7ec8\u7aef\u4e5f\u53ef\u80fd\u5728\u5f00\u95e8\u7a97\u53e3\u671f\u5185\u4e58\u865a\u800c\u5165\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u751f\u4ea7\u73af\u5883\u5fc5\u987b\u575a\u6301\u591a\u5c42\u7eb5\u6df1\u9632\u5fa1\u539f\u5219\uff1a<\/p>\n<ul>\n<li>\u7b2c\u4e00\u5c42\uff1a\u6df7\u6dc6\u4e0e\u964d\u566a\uff08\u7aef\u53e3\u6572\u95e8\uff09\u3002\u5229\u7528 knockd \u5c06\u7aef\u53e3\u5b8c\u5168\u85cf\u4e8e\u9632\u706b\u5899\u540e\uff0c\u4f7f\u6279\u91cf\u626b\u63cf\u5de5\u5177\u65e0\u6cd5\u611f\u77e5 SSH \u670d\u52a1\u7684\u5b58\u5728\uff0c\u5c06\u65e0\u4f11\u6b62\u7684\u7206\u7834\u5c1d\u8bd5\u76f4\u63a5\u62e6\u622a\u5728\u7f51\u7edc\u5c42\u5916\u3002<\/li>\n<li>\u7b2c\u4e8c\u5c42\uff1a\u5bc6\u7801\u5b66\u5f3a\u8ba4\u8bc1\uff08SSH \u5bc6\u94a5\u5bf9\uff09\u3002\u5f7b\u5e95\u7981\u7528\u5bc6\u7801\u8ba4\u8bc1\uff08PasswordAuthentication no\uff09\uff0c\u5e76\u91c7\u7528 Ed25519 \u7b97\u6cd5\u7684\u9ad8\u5f3a\u5ea6\u79c1\u94a5\u767b\u5f55\u3002\u5373\u4f7f\u6709\u4eba\u5076\u7136\u6572\u5f00\u7aef\u53e3\uff0c\u6ca1\u6709\u79c1\u94a5\u4f9d\u7136\u65e0\u6cd5\u8d8a\u96f7\u6c60\u4e00\u6b65\u3002<\/li>\n<li>\u7b2c\u4e09\u5c42\uff1a\u5f02\u5e38\u5ba1\u8ba1\u4e0e\u515c\u5e95\u5c01\u9501\uff08Fail2ban \u4e0e\u5ba1\u8ba1\u65e5\u5fd7\uff09\u3002\u4fdd\u7559 Fail2ban \u4e0e\u7cfb\u7edf\u65e5\u5fd7\u5ba1\u8ba1\u3002\u4e00\u65e6\u6709\u5f02\u5e38\u6d41\u91cf\u5728\u653e\u884c\u7a97\u53e3\u5185\u5c1d\u8bd5\u9519\u8bef\u767b\u5f55\uff0c\u7cfb\u7edf\u4ecd\u4f1a\u81ea\u52a8\u5c06\u5176 IP \u5217\u5165\u5168\u5c40\u963b\u65ad\u9ed1\u540d\u5355\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/09\/ssh-server-layered-defense.webp\" alt=\"\u7aef\u53e3\u6572\u95e8\u3001\u5bc6\u94a5\u767b\u5f55\u4e0e\u5165\u4fb5\u9632\u62a4\u7684\u5206\u5c42\u7eb5\u6df1\u9632\u5fa1\u4f53\u7cfb\u56fe\" loading=\"lazy\" \/><\/p>\n<h2>\u603b\u7ed3\u4e0e\u884c\u52a8\u5efa\u8bae<\/h2>\n<p>SSH \u7aef\u53e3\u6572\u95e8\u662f\u4e00\u9879\u6295\u5165\u4ea7\u51fa\u6bd4\u6781\u9ad8\u7684\u670d\u52a1\u5668\u52a0\u56fa\u65b9\u6848\u3002\u5b83\u4e0d\u6539\u53d8\u73b0\u6709\u7684\u670d\u52a1\u67b6\u6784\uff0c\u5374\u80fd\u4ee5\u6781\u4f4e\u7684\u7cfb\u7edf\u5f00\u9500\u8ba9\u7ba1\u7406\u7aef\u53e3\u8fdb\u5165\u9690\u5f62\u72b6\u6001\uff0c\u89c4\u907f\u7edd\u5927\u591a\u6570\u81ea\u52a8\u5316\u63a2\u6d4b\u4e0e\u66b4\u529b\u7834\u89e3\u98ce\u9669\u3002<\/p>\n<p>\u5982\u679c\u4f60\u9700\u8981\u7ba1\u7406\u627f\u8f7d\u6838\u5fc3\u4e1a\u52a1\u7684\u751f\u4ea7\u4e3b\u673a\uff0c\u5efa\u8bae\u5728\u9009\u7528\u6027\u80fd\u7a33\u5b9a\u3001\u7f51\u7edc\u7eaf\u51c0\u7684 <a href=\"https:\/\/cn.hostease.com\/dedicated-servers.html\">Hostease \u72ec\u7acb\u670d\u52a1\u5668<\/a> \u6216 <a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS<\/a> \u65b9\u6848\u65f6\uff0c\u628a\u7aef\u53e3\u6572\u95e8\u3001SSH \u5bc6\u94a5\u8ba4\u8bc1\u4e0e\u5e26\u5916 VNC \u6551\u63f4\u673a\u5236\u4e00\u540c\u7eb3\u5165\u5b89\u5168\u57fa\u7ebf\u914d\u7f6e\u3002\u53ef\u4ee5\u8003\u8651\u5148\u5728\u6d4b\u8bd5\u5b9e\u4f8b\u4e2d\u9a8c\u8bc1\u6572\u95e8\u89c4\u5219\u4e0e\u7f51\u7edc\u5ef6\u8fdf\u8868\u73b0\uff0c\u786e\u8ba4\u6572\u95e8\u6d41\u7a0b\u7a33\u5b9a\u540e\u518d\u5168\u9762\u90e8\u7f72\uff0c\u8ba9\u670d\u52a1\u5668\u5728\u516c\u7f51\u73af\u5883\u4e2d\u65e2\u575a\u56fa\u53c8\u4f4e\u8c03\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u4e3a\u4f60\u8be6\u89e3 SSH \u7aef\u53e3\u6572\u95e8\uff08Port Knocking\uff09\u7684\u52a0\u56fa\u6307\u5357\uff1a\u5982\u4f55\u901a\u8fc7 knockd \u670d\u52a1\u5c06 SSH \u7aef\u53e3\u5b8c\u5168\u9690\u85cf\u4e8e\u9632\u706b\u5899\u540e\u3001\u914d\u7f6e\u591a\u7aef\u53e3\u6572\u95e8\u5e8f\u5217\u4e0e\u5ba2\u6237\u7aef\u81ea\u52a8\u89e6\u53d1\uff0c\u5e76\u7ed3\u5408 SSH \u5bc6\u94a5\u5b9e\u73b0\u591a\u5c42\u9632\u5fa1\u4e0e\u4e22\u5305\u5e94\u6025\u6392\u9519\uff0c\u5e2e\u52a9\u4f60\u5f7b\u5e95\u8fdc\u79bb\u66b4\u529b\u7834\u89e3\u4e0e\u7aef\u53e3\u626b\u63cf\u3002<\/p>\n","protected":false},"author":2,"featured_media":33220,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3822],"tags":[5098,2754,157,5097,5099],"class_list":["post-33224","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides","tag-knockd","tag-ssh","tag-157","tag-5097","tag-5099"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/09\/ssh-server-cover.webp","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33224","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/comments?post=33224"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33224\/revisions"}],"predecessor-version":[{"id":33382,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33224\/revisions\/33382"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/media\/33220"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/media?parent=33224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/categories?post=33224"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/tags?post=33224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}