\u7570\u5e38\u9577\u7684 TTL \u503c\uff08\u4f8b\u5982 86400 \u79d2\uff09\u53ef\u80fd\u8868\u793a\u52ab\u6301\u3002\u4f7f\u7528 dig \u6307\u4ee4\uff1a<\/p>\n

\r\ndig @[DNS_IP] example.com\r\n<\/code><\/pre>\n
\u5982\u679c\u8fd4\u56de\u7684\u8cc7\u8a0a\u5305\u542b 86400\uff0c\u53ef\u80fd\u8868\u793a\u5b58\u5728\u5165\u4fb5\u3002<\/p>\n
3. \u6aa2\u67e5 NXDOMAIN \u56de\u61c9<\/h3>\n
\u88ab\u52ab\u6301\u7684 DNS \u4f3a\u670d\u5668\u53ef\u80fd\u8fd4\u56de\u5e36\u6709\u932f\u8aa4 SOA \u8a18\u9304\u7684 NXDOMAIN\u3002\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\u6e2c\u8a66\uff1a<\/p>\n
\r\ndig @[DNS_IP] test.ip.example.net\r\n<\/code><\/pre>\n
\u5982\u679c\u56de\u61c9\u5305\u542b SOA \u8a18\u9304\uff0c\u53ef\u80fd\u8868\u793a\u8def\u7531\u5668\u88ab\u5165\u4fb5\u3002<\/p>\n
4. \u9a57\u8b49 DNS \u4f3a\u670d\u5668\u7248\u672c<\/h3>\n
\u4e00\u4e9b\u88ab\u52ab\u6301\u7684\u4f3a\u670d\u5668\u986f\u793a\u7279\u5b9a\u7684\u7248\u672c\u8cc7\u8a0a\uff1a<\/p>\n
\r\ndig @[DNS_IP] version.bind chaos txt\r\n<\/code><\/pre>\n
\u5c0b\u627e\u5305\u542b “unbound 1.16.2″\u3001”sh-dsh-01” \u6216 “hz-ds-z11-10″ \u7684\u56de\u61c9\uff0c\u9019\u53ef\u80fd\u8868\u793a\u5b58\u5728\u5165\u4fb5\u3002<\/p>\n
[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”blog-detail-section”][vc_column][vc_column_text]<\/p>\n
\u9032\u968e\u4fdd\u8b77\u7b56\u7565<\/strong><\/h2>\n
\u5c0d\u65bc\u5c0b\u6c42\u91dd\u5c0d\u52ab\u6301\u7684\u5f37\u5927\u4fdd\u8b77\u7684\u4f3a\u670d\u5668\u79df\u7528\u63d0\u4f9b\u5546\uff0c\u5be6\u65bd\u4ee5\u4e0b\u5168\u9762\u6280\u8853\u4f86\u52a0\u5f37\u60a8\u7684 DNS \u57fa\u790e\u8a2d\u65bd\uff1a<\/p>\n
1. DNSSEC \u5be6\u65bd<\/h3>\n
DNSSEC \u70ba DNS \u8a18\u9304\u6dfb\u52a0\u52a0\u5bc6\u7c3d\u540d\uff0c\u9632\u6b62\u672a\u7d93\u6388\u6b0a\u7684\u66f4\u6539\u3002\u6309\u7167\u4ee5\u4e0b\u6b65\u9a5f\u64cd\u4f5c\uff1a<\/p>\n
\n
\u751f\u6210 DNSSEC \u91d1\u9470\uff1a\n
dnssec-keygen -a RSASHA256 -b 2048 -n ZONE example.com<\/code><\/pre>\n<\/li>\n
\u7c3d\u540d\u60a8\u7684\u5340\u57df\u6a94\u6848\uff1a\n
dnssec-signzone -A -3 $(head -c 1000 \/dev\/random | sha1sum | cut -b 1-16) -N INCREMENT -o example.com -t example.com.zone<\/code><\/pre>\n<\/li>\n
\u66f4\u65b0\u60a8\u7684\u540d\u7a31\u4f3a\u670d\u5668\u8a2d\u5b9a\u4ee5\u4f7f\u7528\u5df2\u7c3d\u540d\u7684\u5340\u57df\u6a94\u6848\u3002<\/li>\n
\u5c07 DS \u8a18\u9304\u6dfb\u52a0\u5230\u60a8\u7684\u7236\u5340\u57df\u3002<\/li>\n<\/ol>\n
2. \u5b89\u5168 DNS \u89e3\u6790\u5668<\/h3>\n
\u5be6\u65bd DNS-over-HTTPS (DoH) \u6216 DNS-over-TLS (DoT) \u4ee5\u52a0\u5bc6 DNS \u67e5\u8a62\u3002\u5c0d\u65bc DoH\uff0c\u4f7f\u7528\u6b64 Nginx \u8a2d\u5b9a\uff1a<\/p>\n
\r\nserver {\r\n    listen 443 ssl http2;\r\n    server_name dns.example.com;\r\n\r\n    ssl_certificate \/path\/to\/cert.pem;\r\n    ssl_certificate_key \/path\/to\/key.pem;\r\n\r\n    location \/ {\r\n        proxy_pass https:\/\/1.1.1.1;\r\n        proxy_set_header Host $host;\r\n        proxy_set_header X-Real-IP $remote_addr;\r\n    }\r\n}\r\n<\/code><\/pre>\n
3. DNS \u67e5\u8a62\u76e3\u63a7<\/h3>\n
\u8a2d\u7f6e\u76e3\u63a7\u7cfb\u7d71\u4ee5\u5075\u6e2c DNS \u67e5\u8a62\u4e2d\u7684\u7570\u5e38\u6a21\u5f0f\u3002\u4f7f\u7528\u8af8\u5982 dnstap \u7b49\u5de5\u5177\u548c\u81ea\u8a02\u8173\u672c\u4f86\u5206\u6790\u67e5\u8a62\u65e5\u8a8c\uff1a<\/p>\n
\r\n#!\/bin\/bash\r\ndnstap-read \/var\/log\/named\/dnstap.log | \\\r\nawk '{print $8}' | \\\r\nsort | uniq -c | sort -rn | \\\r\nhead -n 10 > \/var\/log\/dns_query_summary.txt\r\n<\/code><\/pre>\n
4. DNS \u9632\u706b\u7246<\/h3>\n
\u5be6\u65bd\u56b4\u683c\u7684\u9632\u706b\u7246\u898f\u5247\u4ee5\u63a7\u5236\u6d41\u91cf\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 iptables \u7684\u7bc4\u4f8b\uff1a<\/p>\n
\r\n# \u50c5\u5141\u8a31\u5c0d\u53ef\u4fe1\u4f3a\u670d\u5668\u9032\u884c DNS \u67e5\u8a62\r\niptables -A OUTPUT -p udp --dport 53 -d 8.8.8.8 -j ACCEPT\r\niptables -A OUTPUT -p udp --dport 53 -d 1.1.1.1 -j ACCEPT\r\n\r\n# \u963b\u6b62\u6240\u6709\u5176\u4ed6\u51fa\u7ad9 DNS \u67e5\u8a62\r\niptables -A OUTPUT -p udp --dport 53 -j DROP\r\n<\/code><\/pre>\n
5. \u5b9a\u671f\u5b89\u5168\u7a3d\u6838<\/h3>\n
\u4f7f\u7528\u8173\u672c\u5be6\u65bd\u81ea\u52d5\u6bcf\u65e5\u6aa2\u67e5\uff1a<\/p>\n
\r\n#!\/bin\/bash\r\n# \u6aa2\u67e5\u56de\u61c9\r\ndig @your_dns_server example.com | grep -q \"ANSWER: 0\" && echo \"\u7591\u4f3c DNS \u52ab\u6301\uff01\" || echo \"DNS \u4f3c\u4e4e\u6b63\u5e38\u3002\"\r\n\r\n# \u6aa2\u67e5 TTL \u503c\r\ndig @your_dns_server example.com | grep -q \"86400\" && echo \"\u5075\u6e2c\u5230\u53ef\u7591 TTL\uff01\" || echo \"TTL \u4f3c\u4e4e\u6b63\u5e38\u3002\"\r\n\r\n# \u6aa2\u67e5 DNS \u7248\u672c\r\ndig @your_dns_server version.bind chaos txt | grep -q \"unbound 1.16.2\" && echo \"\u5075\u6e2c\u5230\u53ef\u7591 DNS \u7248\u672c\uff01\" || echo \"DNS \u7248\u672c\u4f3c\u4e4e\u6b63\u5e38\u3002\"\r\n<\/code><\/pre>\n
6. \u5ba2\u6236\u6559\u80b2\u8a08\u756b<\/h3>\n
\u5236\u5b9a\u5168\u9762\u7684\u5ba2\u6236\u6559\u80b2\u8a08\u756b\uff1a<\/p>\n
\n
\u5efa\u7acb\u95dc\u65bc\u4fdd\u8b77\u5bb6\u7528\u8def\u7531\u5668\u7684\u5f71\u7247\u6559\u5b78<\/li>\n
\u63d0\u4f9b\u8b58\u5225 DNS \u52ab\u6301\u8de1\u8c61\u7684\u6e05\u55ae<\/li>\n
\u5b9a\u671f\u8209\u8fa6\u7db2\u8def\u5b89\u5168\u6700\u4f73\u5be6\u8e10\u7db2\u8def\u7814\u8a0e\u6703<\/li>\n
\u5be6\u65bd\u5b89\u5168\u66f4\u65b0\u548c\u8b66\u5831\u7684\u901a\u77e5\u7cfb\u7d71<\/li>\n<\/ul>\n
\u901a\u904e\u5be6\u65bd\u9019\u4e9b\u9032\u968e\u7b56\u7565\uff0c\u4f3a\u670d\u5668\u79df\u7528\u63d0\u4f9b\u5546\u53ef\u4ee5\u986f\u8457\u589e\u5f37\u5c0d DNS \u52ab\u6301\u5617\u8a66\u7684\u4fdd\u8b77\uff0c\u4e26\u78ba\u4fdd\u5176 DNS \u57fa\u790e\u8a2d\u65bd\u7684\u5b8c\u6574\u6027\u3002<\/p>\n
[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"
[vc_row el_class=”blog-detail-section”][vc_ […]<\/p>\n
Read More…<\/a><\/p>\n","protected":false},"author":2,"featured_media":14985,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[61],"tags":[3173,3170,1892,578],"class_list":["post-14990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hong-kong-dedicated-server-tc","tag--tc","tag-dns-hijacking-tc","tag-server-hosting-tc","tag-network-security-tc"],"acf":[],"yoast_head":"\n