{"id":255,"date":"2023-06-27T15:33:50","date_gmt":"2023-06-27T07:33:50","guid":{"rendered":"https:\/\/www.hoongdou.com\/?p=255"},"modified":"2024-08-27T00:22:50","modified_gmt":"2024-08-26T16:22:50","slug":"icmp%e6%a0%a1%e9%aa%8c%e5%92%8c","status":"publish","type":"post","link":"https:\/\/www.hoongdou.com\/index.php\/2023\/06\/27\/icmp%e6%a0%a1%e9%aa%8c%e5%92%8c\/","title":{"rendered":"ICMP\u6821\u9a8c\u548c"},"content":{"rendered":"\n<div class=\"has-toc have-toc\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u524d\u8a00<\/h2>\n\n\n\n<p>\u8fd9\u662f\u51e0\u5e74\u524d\u5199\u7684\u4e00\u4efdtxt\uff0c\u5927\u6982\u5185\u5bb9\u5fd8\u4e86\uff0c\u5e94\u8be5\u662f\u6c42\u8bc1icmp\u7684\u6821\u9a8c\u548c<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6587\u5b57\u90e8\u5206(\u6d41\u7a0b)<\/h2>\n\n\n\n<p>\u53d1\u9001\u7aef<br>1\uff09\u5c06\u53d1\u9001\u7684IP\u5934\u90e8\u4e2d\u7684\u68c0\u9a8c\u548c\u5b57\u6bb5\u8bbe\u7f6e\u4e3a0\uff0c\u7136\u540e\u4ee516\u4f4d\u4e3a\u4e00\u4e2a\u95f4\u9694\uff0c\u5c06IP\u5934\u90e8\u5206\u6210\u8bb8\u591a\u4e2a16\u4f4d\u7684\u5b57\u6bb5<br>2\uff09\u5c06\u7b2c1\u6b65\u83b7\u5f97\u7684\u6240\u6709\u5b57\u6bb5\u8fdb\u884c\u4e8c\u8fdb\u5236\u76f8\u52a0\u6c42\u548c<br>3\uff09\u628a\u6700\u7ec8\u7ed3\u679c\u53d6\u53cd\uff0c\u4e5f\u5c31\u662f0\u7f6e\u4f4d1,1\u7f6e\u4f4d0\uff0c\u5c31\u5f97\u5230\u68c0\u9a8c\u548c\uff0c\u518d\u5c06\u8be5\u503c\u586b\u5145\u5230IP\u5934\u90e8\u3002<\/p>\n\n\n\n<p>\u63a5\u6536\u7aef<br>\u628a\u63a5\u6536\u5230\u7684IP\u5934\u90e8\u5206\u621016\u4f4d\u7684\u95f4\u9694<br>\u6240\u6709\u5b57\u6bb5\u8fdb\u884c\u4e8c\u8fdb\u5236\u76f8\u52a0\u6c42\u548c<br>\u7ed3\u679c\u53d6\u53cd<br>\u5982\u679c\u7ed3\u679c\u4e3a0\uff0c\u8bf4\u660e\u6821\u9a8c\u6b63\u786e<\/p>\n\n\n\n<p>\u63a5\u6536\u65b9\u8fdb\u884c\u6821\u9a8c\u65f6\uff0c\u4e5f\u662f\u5bf9\u6bcf16\u4f4d\u8fdb\u884c\u4e8c\u8fdb\u5236\u53cd\u7801\u6c42\u548c\u3002<br>\u63a5\u6536\u65b9\u8ba1\u7b97\u6821\u9a8c\u548c\u65f6\u7684\u9996\u90e8\u4e0e\u53d1\u9001\u65b9\u8ba1\u7b97\u6821\u9a8c\u548c\u65f6\u7684\u9996\u90e8\u76f8\u6bd4\uff0c\u591a\u4e86\u4e00\u4e2a\u53d1\u9001\u65b9\u8ba1\u7b97\u51fa\u6765\u7684\u6821\u9a8c\u548c\u3002<br>\u56e0\u6b64\uff0c\u5982\u679c\u9996\u90e8\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u6ca1\u6709\u53d1\u751f\u5dee\u9519\uff0c\u90a3\u4e48\u63a5\u6536\u65b9\u8ba1\u7b97\u7684\u7ed3\u679c\u5e94\u8be5\u4e3a\u5168\u4e00\uff0c\u56e0\u4e3a\u63a5\u6536\u65b9\u8ba1\u7b97\u9664\u6821\u9a8c\u548c\u4ee5\u5916\u7684\u90e8\u5206\u5f97\u5230\u503c\u662f\u6821\u9a8c\u548c\u7684\u53cd\u7801\uff0c\u518d\u52a0\u591a\u51fa\u6765\u7684\u6821\u9a8c\u548c\u5f53\u7136\u662f\u5168\u4e00\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee3\u7801\u90e8\u5206<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>unsigned short checksum(unsigned short *buffer, int size)\n{\n    unsigned long cksum=0;\n    while(size &gt;1) {\n        cksum+=*buffer++;\n        size-=sizeof(unsigned short);\n    }\n    if(size) cksum+=*(unsigned short*)buffer;\n    cksum=(cksum &gt;&gt; 16)+(cksum&amp;0xffff);\n    cksum+=(cksum &gt;&gt;16);\n    return (unsigned short)(~cksum);\n}\n\n\nunsigned short checksum(unsigned short *buffer, int size)\n{\n    unsigned long cksum=0;                          \/\/\u521d\u59cb\u5316\u8981\u6821\u9a8c\u7684\u6821\u9a8c\u548c\n    while(size &gt;1) {                                \/\/\u5c06IP\u9996\u90e8\u7684\u5185\u5bb9\u4ee516\u4f4d\u4e3a\u5355\u4f4d\u76f8\u52a0\n        cksum+=*buffer++; \n        size-=sizeof(unsigned short);\n    }\n    if(size) cksum+=*(unsigned short*)buffer;      \n    cksum=(cksum &gt;&gt; 16)+(cksum&amp;0xffff);            \/\/\u9ad816\u4f4d\u79fb\u4f4d\u5230\u4f4e16\u4f4d,\u4f4e16\u4f4d\u76f8\u52a0\n    cksum+=(cksum &gt;&gt;16);                           \/\/\u518d\u6b21\u79fb\u4f4d\u76f8\u52a0\u907f\u514d\u8fdb\u4f4d\n    return (unsigned short)(~cksum);               \/\/\u8fd4\u56de\u53d6\u53cd\u503c\n}\n\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u6d4b\u8bd5<\/h2>\n\n\n\n<p>\u7b2c\u4e00\u6bb5ICMP\u5305\u768416\u8fdb\u5236\u6570\u503c\u4e3a\u4ee5\u4e0b\u7684\u503c\uff0c\u5176\u4e2d00B8\u4e3a\u6821\u9a8c\u548c\u3002<\/p>\n\n\n\n<p>4500 003C A5D0 0000 8001 0000<br>C0A8 0009 C0A8 00B8<\/p>\n\n\n\n<p>\u7b2c\u4e8c\u6bb5ICMP\u5305\u768416\u8fdb\u5236\u6570\u503c\u4e3a\u4ee5\u4e0b\u7684\u503c\uff0c\u5176\u4e2d00B8\u4e3a\u6821\u9a8c\u548c\u3002<\/p>\n\n\n\n<p>4500 003C A5D0 0000 8001 12DF<br>C0A8 0009 C0A8 00B8<\/p>\n\n\n\n<p><br><\/p>\n\n\n\n<p>\u8ba1\u7b97\u8fc7\u7a0b\u5982\u4e0b<\/p>\n\n\n\n<p>4500+003C+A5D0+0000+8001+0000+C0A8+0009+C0A8+00B8=2 ED1E<br>0002+ED1E<br>0002+ED1E=ED20 = 1110 1101 0010 0000<br>~ED20 = 0001 0010 1101 1111 =12DF<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>4500+003C+A5D0+0000+8001+12DF+C0A8+0009+C0A8+00B8=2 FFFD<br>0002+FFFD<br>0002+FFFD=FFFF =1111 1111 1111 1111<br>~FFFF = 0000 0000 0000 0000<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u8fd9\u662f\u51e0\u5e74\u524d\u5199\u7684\u4e00\u4efdtxt\uff0c\u5927\u6982\u5185\u5bb9\u5fd8\u4e86\uff0c\u5e94\u8be5\u662f\u6c42\u8bc1icmp\u7684\u6821\u9a8c\u548c \u6587\u5b57\u90e8\u5206(\u6d41\u7a0b) \u53d1\u9001\u7aef1\uff09\u5c06\u53d1\u9001\u7684IP\u5934\u90e8\u4e2d\u7684\u68c0\u9a8c\u548c\u5b57\u6bb5\u8bbe\u7f6e\u4e3a0\uff0c\u7136\u540e\u4ee516\u4f4d","protected":false},"author":1,"featured_media":316,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[7],"class_list":["post-255","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-study","tag-study"],"_links":{"self":[{"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/posts\/255","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/comments?post=255"}],"version-history":[{"count":2,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/posts\/255\/revisions"}],"predecessor-version":[{"id":257,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/posts\/255\/revisions\/257"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/media\/316"}],"wp:attachment":[{"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/media?parent=255"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/categories?post=255"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/tags?post=255"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}