{"id":576,"date":"2021-11-20T10:35:15","date_gmt":"2021-11-20T02:35:15","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=576"},"modified":"2021-11-21T00:34:44","modified_gmt":"2021-11-20T16:34:44","slug":"arp%e5%8d%8f%e8%ae%ae","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=576","title":{"rendered":"ARP\u534f\u8bae"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-right counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69e0ad5e5e1e6\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69e0ad5e5e1e6\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E6%A6%82%E8%BF%B0\" >\u6982\u8ff0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E6%8A%A5%E6%96%87%E6%A0%BC%E5%BC%8F\" >\u62a5\u6587\u683c\u5f0f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#arp%E5%91%BD%E4%BB%A4%E7%9A%84%E4%BD%BF%E7%94%A8\" >arp\u547d\u4ee4\u7684\u4f7f\u7528<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E6%9F%A5%E7%9C%8Barp%E7%BC%93%E5%AD%98\" >\u67e5\u770barp\u7f13\u5b58<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E4%BB%A3%E7%90%86ARP\" >\u4ee3\u7406ARP<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E5%88%A0%E9%99%A4arp%E7%BC%93%E5%AD%98\" >\u5220\u9664arp\u7f13\u5b58<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E5%A2%9E%E5%8A%A0arp%E7%BC%93%E5%AD%98\" >\u589e\u52a0arp\u7f13\u5b58<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E8%AE%BE%E7%BD%AE%E7%BD%91%E5%8D%A1%E7%9A%84mac%E5%9C%B0%E5%9D%80\" >\u8bbe\u7f6e\u7f51\u5361\u7684mac\u5730\u5740<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#arp%E5%91%BD%E4%BB%A4%E9%80%89%E9%A1%B9\" >arp\u547d\u4ee4\u9009\u9879<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#arp%E5%91%BD%E4%BB%A4%E7%A4%BA%E4%BE%8B\" >arp\u547d\u4ee4\u793a\u4f8b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E6%A6%82%E5%BF%B5%E8%BE%A8%E6%9E%90\" >\u6982\u5ff5\u8fa8\u6790<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=576\/#%E7%BD%91%E5%85%B3\" >\u7f51\u5173<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A6%82%E8%BF%B0\"><\/span>\u6982\u8ff0<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>Address Resolution Protocol\uff0cRFC 826.<\/p>\n\n\n\n<p>ARP\u534f\u8bae\u80fd\u591f\u5b9e\u73b0\u4efb\u610f\u7f51\u7edc\u5c42\u5730\u5740\u5230\u4efb\u610f\u7269\u7406\u5730\u5740\u7684\u8f6c\u6362\uff0c\u4f46\u662f\u6211\u4eec\u53ea\u5173\u6ce8\u4eceIP\u5730\u5740\u5230\u4ee5\u592a\u7f51\u5730\u5740(MAC\u5730\u5740)\u7684\u8f6c\u6362\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%8A%A5%E6%96%87%E6%A0%BC%E5%BC%8F\"><\/span>\u62a5\u6587\u683c\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code> 0               1              \n 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n|         Hardware Type         |\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n|         Protocol Type         |\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n| Hard Addr len |Proto Addr len |\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n|           Operation           |\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n|                               |\n+                               +\n|    Sender Hardware Address    |\n+                               +\n|                               |\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n|                               |\n+    Sender Protocol Address    +\n|                               |\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n|                               |\n+                               +\n|    Target Hardware Address    |\n+                               +\n|                               |\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n|                               |\n+    Target Protocol Address    +\n|                               |\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n<\/code><\/pre>\n\n\n\n<p>\u62a5\u6587\u5b57\u6bb5<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td><strong>\u5b57\u6bb5\u540d<\/strong><\/td><td><strong>\u957f\u5ea6<\/strong><\/td><td><strong>\u542b\u4e49<\/strong><\/td><\/tr><tr><td>\u786c\u4ef6\u7c7b\u578b<\/td><td>2\u5b57\u8282<\/td><td>\u5b9a\u4e49\u7269\u7406\u5730\u5740\u7684\u7c7b\u578b\uff0c\u503c\u4e3a1\u65f6\u8868\u793aMAC\u5730\u5740\uff1b<\/td><\/tr><tr><td>\u534f\u8bae\u7c7b\u578b<\/td><td>2\u5b57\u8282<\/td><td>\u5b9a\u4e49\u8981\u6620\u5c04\u7684\u7f51\u7edc\u5c42\u5730\u5740\u7c7b\u578b\uff0c\u503c\u4e3a0x800\u65f6\u8868\u793aIP\u5730\u5740\uff1b<\/td><\/tr><tr><td>\u786c\u4ef6\u5730\u5740\u957f\u5ea6<\/td><td>1\u5b57\u8282<\/td><td>\u8868\u793a\u7269\u7406\u5730\u5740\u7684\u957f\u5ea6\uff0c\u5bf9MAC\u5730\u5740\u6765\u8bf4\u957f\u5ea6\u4e3a6\uff1b<\/td><\/tr><tr><td>\u534f\u8bae\u5730\u5740\u957f\u5ea6<\/td><td>1\u5b57\u8282<\/td><td>\u8868\u793a\u7f51\u7edc\u534f\u8bae\u5730\u5740\u7684\u957f\u5ea6\uff0c\u5bf9IP\u5730\u5740\u6765\u8bf4\uff0c\u5176\u957f\u5ea6\u4e3a4\uff1b<\/td><\/tr><tr><td>\u64cd\u4f5c\u5b57\u6bb5<\/td><td>2\u5b57\u8282<\/td><td>\u5bf9\u4e8e\u4ee5\u592a\u7f51\u67094\u79cd\u64cd\u4f5c\u7c7b\u578b\uff0cARP\u8bf7\u6c42(\u503c\u4e3a1)\uff0cARP\u5e94\u7b54(\u503c\u4e3a2),RARP\u8bf7\u6c42(\u503c\u4e3a3)\uff0cRARP\u8bf7\u6c42(\u503c\u4e3a4)\uff1b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6700\u540e\u8fd94\u4e2a\u5b57\u6bb5\u6307\u5b9a\u901a\u4fe1\u65f6\u53cc\u65b9\u7684\u4ee5\u592a\u7f51\u5730\u5740\u548cIP\u5730\u5740\u3002\u53d1\u9001ARP\u8bf7\u6c42\u7684\u4f1a\u7a7a\u7740Target Hardware Address\u4e0d\u586b(\u8c8c\u4f3c\u586b\u7684\u662f-1\uff1f)\uff0c\u53ea\u586b\u5176\u4f593\u4e2a\u5730\u5740\uff0c\u56e0\u4e3a\u53d1\u9001\u65b9\u4e0d\u77e5\u9053Target Protocol Address\u5bf9\u5e94\u7684\u673a\u5668\u662f\u54ea\u4e2a\uff0c\u4ed6\u5c31\u8fd9\u6837\u628a\u8fd9\u4e2a\u6d88\u606f\u5728\u5c40\u57df\u7f51\u5185\u5e7f\u64ad\u3002Target Protocol Address \u5bf9\u5e94\u7684\u673a\u5668\u5728\u6536\u5230\u8fd9\u6761\u6d88\u606f\u540e\uff0c\u4ed6\u5c31\u7ed9\u53d1\u9001\u65b9\u56de\u4e00\u6761ARP\u5e94\u7b54\uff0c\u7531\u4e8e\u53d1\u9001\u65b9\u5728ARP\u8bf7\u6c42\u91cc\u6709\u586b\u5199\u53d1\u9001\u65b9\u7684\u7f51\u7edc\u5730\u5740\u548c\u7269\u7406\u5730\u5740\uff0c\u5e94\u7b54\u7684\u673a\u5668\u5f53\u7136\u4e5f\u77e5\u9053\u81ea\u5df1\u7684\u7f51\u7edc\u5730\u5740\u548c\u7269\u7406\u5730\u5740\uff0c\u6240\u4ee5\u5e94\u7b54\u673a\u5668\u53d1\u51fa\u7684ARP\u5e94\u7b54\u6d88\u606f\u91cc\u5c31\u4f1a\u628a\u56db\u4e2a\u5730\u5740\u90fd\u7ed9\u586b\u4e0a\u3002\u53d1\u9001ARP\u8bf7\u6c42\u7684\u673a\u5668\u5728\u6536\u5230ARP\u5e94\u7b54\u540e\uff0c\u5c31\u6839\u636eARP\u5e94\u7b54\u6d88\u606f\u91cc\u7684\u6e90\u7269\u7406\u5730\u5740\u548c\u6e90\u7f51\u7edc\u5730\u5740\u5efa\u7acb\u4e86\u6620\u5c04\uff0c\u4e5f\u5c31\u77e5\u9053\u4e86\u4ed6\u5f53\u521d\u95ee\u7684\u7f51\u7edc\u5730\u5740\u5bf9\u5e94\u673a\u5668\u7684\u7269\u7406\u5730\u5740\u3002<\/p>\n\n\n\n<p><br>\u7531\u4e8e\u4ee5\u592a\u7f51\u5e27\u7684Payload\u81f3\u5c1146\u5b57\u8282\uff0c\u6240\u4ee5ARP\u8bf7\u6c42\/\u5e94\u7b54\u6d88\u606f\u4f1a\u589e\u52a0\u4e00\u4e9b\u586b\u5145\u5b57\u8282\uff0c\u8fd9\u6837\u4e00\u4e2a\u643a\u5e26ARP\u8bf7\u6c42\/\u5e94\u7b54\u7684\u4ee5\u592a\u7f51\u5e27\u5c31\u662f64\u5b57\u8282\u3002<\/p>\n\n\n\n<p>ARP\u8bf7\u6c42\u4e0d\u80fd\u7a7f\u8fc7\u8def\u7531\u5668\uff0c\u53ea\u80fd\u5728\u540c\u4e00\u4e2a\u7f51\u6bb5\u5185\u5e7f\u64ad\u3002\u5728\u8def\u7531\u5668\u542f\u7528\u4ee3\u7406ARP\u529f\u80fd\uff0c\u4e14\u4e3b\u673a\u6ca1\u6709\u8bbe\u7f6e\u9ed8\u8ba4gateway\u7684\u60c5\u51b5\u4e0b\uff0cARP\u8bf7\u6c42\u53ef\u4ee5\u5728\u8def\u7531\u5668\u8fde\u63a5\u7684\u4e0d\u540c\u7f51\u6bb5\u4e2d&#8221;\u7a7f\u900f&#8221;\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"arp%E5%91%BD%E4%BB%A4%E7%9A%84%E4%BD%BF%E7%94%A8\"><\/span>arp\u547d\u4ee4\u7684\u4f7f\u7528<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%9F%A5%E7%9C%8Barp%E7%BC%93%E5%AD%98\"><\/span>\u67e5\u770barp\u7f13\u5b58<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>arp<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"750\" height=\"92\" src=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/11\/arp_show_all_entries.png\" alt=\"\" class=\"wp-image-580\" srcset=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/11\/arp_show_all_entries.png 750w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/11\/arp_show_all_entries-300x37.png 300w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/11\/arp_show_all_entries-670x82.png 670w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/figure>\n\n\n\n<p>\u5176\u4e2d<strong>\u6807\u5fd7<\/strong>\u4e00\u5217\u7684\u542b\u4e49\uff1a<\/p>\n\n\n\n<p>C\u4ee3\u8868Cached entry\uff1b<\/p>\n\n\n\n<p>M\u4ee3\u8868Permanent entry\uff1b<\/p>\n\n\n\n<p>P\u4ee3\u8868Published entry\uff1b\u5728\u8bbe\u7f6earp proxy\u65f6\u4f1a\u9700\u8981Published entry\uff0c\u5e76\u4e14\u4f1a\u548cnetmask(\u5373\u4e0a\u56fe\u4e2d\u7684Mask)\u7ed3\u5408\u4f7f\u7528\uff0c\u5c06\u6574\u4e2a\u5b50\u7f51\u7684arp\u8bf7\u6c42\u8f6c\u53d1\u5230\u5bf9\u5e94\u7684\u7269\u7406\u5730\u5740\u3002\u65b0\u5185\u6838\u5df2\u7ecf\u4e0d\u652f\u6301\u901a\u8fc7\u8bbe\u7f6enetmask\u6765 proxy\u6574\u4e2a\u5b50\u7f51\u7684arp\u8bf7\u6c42\uff0c\u800c\u662f\u901a\u8fc7\u8def\u7531\u5b9e\u73b0\u4e86\u8fd9\u4e2a\u529f\u80fd\u3002<\/p>\n\n\n\n<p>arp\u7f13\u5b58\u8868\u80fd\u591f\u4fdd\u5b58\u7684\u6761\u76ee\u662f\u6709\u9650\u7684\uff0c\u56e0\u6b64\u6709\u4e00\u4e2a\u5783\u573e\u56de\u6536\u7684\u7b97\u6cd5\u4e0d\u65ad\u5730\u56de\u6536\u7f13\u5b58\u8868\u4e2d\u8001\u65e7\u7684\u548c\u4e0d\u5e38\u4f7f\u7528\u7684\u6761\u76ee\uff0c\u800c\u88ab\u6807\u8bb0\u4e3apermanent\u7684\u6761\u76ee\u5219\u6c38\u8fdc\u4e0d\u4f1a\u88ab\u56de\u6536\u3002\u4e00\u822c\u4e00\u4e2aarp\u6761\u76ee20\u5206\u949f\u4e0d\u7528\u5c31\u7b97\u8d85\u65f6\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u4e00\u4e2aCached arp\u6761\u76ee\u8d85\u8fc7\u4e00\u6bb5\u65f6\u95f4\u6ca1\u6709\u6536\u5230\u6b63\u53cd\u9988\uff0c\u90a3\u4e48\u8fd9\u4e2aarp\u6761\u76ee\u5c31\u4f1a\u88ab\u8ba4\u4e3a\u5931\u6548\u3002\u83b7\u53d6\u6b63\u53cd\u9988\u7684\u65b9\u5f0f\u6765\u81ea\u4e8e\u4e0a\u5c42\u534f\u8bae\u7684signal\uff0c\u6bd4\u5982\u6210\u529f\u6536\u5230TCP ACK\uff0c\u6216\u8005\u662fsendmsg\u8bbe\u7f6e\u4e86MSG_CONFIRM\u6807\u5fd7\u3002<\/p>\n\n\n\n<p>\u5f53\u4e00\u4e2aCached arp\u6761\u76ee\u5931\u6548\u540e\uff0c\u4f1a\u5148\u4ecelocal arp daemon\u66f4\u65b0\u6574\u4e2aarp\u7f13\u5b58\uff0c\u5982\u679c\u6ca1\u80fd\u6210\u529f\u66f4\u65b0\uff0c\u4f1a\u518d\u5411local arp daemon\u53d1\u8bf7\u6c42\u5355\u72ec\u66f4\u65b0\u8fd9\u4e2a\u5730\u5740\u7684mac\u5730\u5740\uff0c\u5982\u679c\u518d\u5931\u8d25\u624d\u53d1\u5e7f\u64ad\u8bf7\u6c42\u8fd9\u4e2a\u5730\u5740\u7684mac\u5730\u5740\u3002\u53ea\u6709\u6709\u6570\u636e\u9700\u8981\u53d1\u9001\u65f6\u624d\u9700\u8981\u66f4\u65b0\u5bf9\u5e94\u7684arp\u6761\u76ee\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>arp -a<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"641\" height=\"75\" src=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/11\/arp-a_show_all_entries.png\" alt=\"\" class=\"wp-image-581\" srcset=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/11\/arp-a_show_all_entries.png 641w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/11\/arp-a_show_all_entries-300x35.png 300w\" sizes=\"auto, (max-width: 641px) 100vw, 641px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BB%A3%E7%90%86ARP\"><\/span>\u4ee3\u7406ARP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u4e0a\u9762\u8bb2\u5230\u4e86\u4ee3\u7406ARP(proxy ARP)\uff1a\u5f53\u4e00\u4e2a\u8def\u7531\u5668\u8fde\u63a5\u4e862\u4e2a\u5b50\u7f51A\u548cB\u65f6\uff0c\u5b50\u7f51A\u91cc\u7684host1\u6ca1\u6709\u8bbe\u7f6e\u7f51\u5173\uff0c\u4e14host1\u60f3\u8981\u53d1\u5305\u7ed9\u5b50\u7f51B\u91cc\u7684host2\uff0c\u4e8e\u662fhost1\u9700\u8981\u77e5\u9053\u5b50\u7f51B\u91cc\u7684host2\u7684MAC\u5730\u5740\uff0chost1\u53d1\u7684\u5e7f\u64adARP\u8bf7\u6c42\u5230\u4e86\u8def\u7531\u5668\uff0c\u8def\u7531\u5668\u5c31\u4f1a\u56de\u590d\u81ea\u5df1\u7684MAC\u5730\u5740\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u4ee3\u7406ARP\u529f\u80fd\u53ea\u6709\u5728\u6ca1\u6709\u8bbe\u7f6e\u7f51\u5173\u7684\u65f6\u5019\u624d\u9700\u8981\uff0c\u5728\u6709\u7f51\u5173\u65f6\uff0c\u7535\u8111host1\u53ea\u9700\u8981\u6309\u7167\u8def\u7531\u8868\u5c06\u6570\u636e\u5305\u6254\u7ed9\u7f51\u5173\uff0c\u7531\u7f51\u5173\u518d\u5c06\u6570\u636e\u5305\u8f6c\u53d1\u7ed9host2\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0bhost1\u5c31\u4e0d\u518d\u9700\u8981\u53d1ARP\u8bf7\u6c42\u8be2\u95eehost2\u7684MAC\u5730\u5740\u4e86\uff0c\u800c\u662f\u53d1ARP\u8bf7\u6c42\u8be2\u95ee\u7f51\u5173\u7684\u5730\u5740\u5373\u53ef\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/28929126\">\u8fd9\u7bc7\u77e5\u4e4e\u6587\u7ae0<\/a>\u8bb2\u7684\u5f88\u6e05\u695a\u3002<\/p>\n\n\n\n<p>\u5728Linux\u4e0a\u53ef\u4ee5\u901a\u8fc7\u4e0b\u9762\u7684\u547d\u4ee4\u6765\u5f00\u542fauto-proxy ARP\u7279\u6027\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>echo 1 > \/proc\/sys\/net\/ipv4\/conf\/&lt;device-name>\/proxy_arp<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%88%A0%E9%99%A4arp%E7%BC%93%E5%AD%98\"><\/span>\u5220\u9664arp\u7f13\u5b58<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>arp -d &lt;ip\/hostname&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%A2%9E%E5%8A%A0arp%E7%BC%93%E5%AD%98\"><\/span>\u589e\u52a0arp\u7f13\u5b58<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>arp -s &lt;ip\/hostname&gt; &lt;hw_addr&gt;<\/code><\/pre>\n\n\n\n<p>\u786c\u4ef6\u5730\u5740\u683c\u5f0f\u4e3a\u5192\u53f7\u5206\u9694\u768416\u8fdb\u5236mac\u5730\u5740\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AE%BE%E7%BD%AE%E7%BD%91%E5%8D%A1%E7%9A%84mac%E5%9C%B0%E5%9D%80\"><\/span>\u8bbe\u7f6e\u7f51\u5361\u7684mac\u5730\u5740<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>arp -Ds &lt;ip\/hostname&gt; &lt;ifname&gt;<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528\u8fd9\u4e2a\u547d\u4ee4\u65f6\uff0c\u786c\u4ef6\u5730\u5740\u4f1a\u81ea\u52a8\u8bbe\u7f6e\u4e3a\u7f51\u5361ifname\u7684mac\u5730\u5740\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"arp%E5%91%BD%E4%BB%A4%E9%80%89%E9%A1%B9\"><\/span>arp\u547d\u4ee4\u9009\u9879<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u9009\u9879<\/td><td>\u542b\u4e49<\/td><\/tr><tr><td>-i &lt;IF&gt;<\/td><td>\u6307\u5b9a\u7f51\u5361<\/td><\/tr><tr><td>-n, &#8211;numeric<\/td><td>\u663e\u793a\u6570\u5b57\u683c\u5f0f\u7684\u5730\u5740<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"arp%E5%91%BD%E4%BB%A4%E7%A4%BA%E4%BE%8B\"><\/span>arp\u547d\u4ee4\u793a\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>arp -i eth0 -Ds 10.0.0.2 eth1 pub<\/code><\/pre>\n\n\n\n<p>\u5bf9\u6765\u81eaeth0\u7684arp\u8bf7\u6c42\uff0c\u7528eth1\u7684mac\u5730\u5740\u54cd\u5e94<\/p>\n\n\n\n<p><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>arp -i eth1 -d 10.0.0.1<\/code><\/pre>\n\n\n\n<p>\u5220\u9664eth1\u7f51\u5361\u4e0a\u768410.0.0.1\u8fd9\u4e2a\u5730\u5740\u5bf9\u5e94\u7684arp Proxy\u6216\u8005Permanent\u6761\u76ee\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A6%82%E5%BF%B5%E8%BE%A8%E6%9E%90\"><\/span>\u6982\u5ff5\u8fa8\u6790<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%BD%91%E5%85%B3\"><\/span><a href=\"https:\/\/www.ibm.com\/docs\/en\/aix\/7.1?topic=routing-tcpip-gateways\" data-type=\"URL\" data-id=\"https:\/\/www.ibm.com\/docs\/en\/aix\/7.1?topic=routing-tcpip-gateways\">\u7f51\u5173<\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5728\u7f51\u7edc\u5c42\u4ea4\u6362\u4e24\u4e2a\u7f51\u7edc\u6570\u636e\u7684\u8bbe\u5907\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8ff0 Address Resolution Protocol\uff0cRFC 826. ARP\u534f\u8bae\u80fd\u591f\u5b9e\u73b0\u4efb\u610f\u7f51\u7edc\u5c42\u5730\u5740\u5230\u4efb\u610f\u7269\u7406\u5730\u5740\u7684\u8f6c\u6362\uff0c\u4f46\u662f\u6211\u4eec\u53ea\u5173\u6ce8\u4eceIP\u5730\u5740\u5230\u4ee5\u592a\u7f51\u5730\u5740(MAC\u5730\u5740)\u7684\u8f6c\u6362\u3002 \u62a5\u6587\u683c&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[58,57,56],"class_list":["post-576","post","type-post","status-publish","format-standard","hentry","category-10","tag-arp","tag-linux","tag-tcp-ip"],"_links":{"self":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/576","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=576"}],"version-history":[{"count":14,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/576\/revisions"}],"predecessor-version":[{"id":641,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/576\/revisions\/641"}],"wp:attachment":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}