如何判断交换机是否受到ARP攻击以及处理方式 如何检查交换机是否受到ARP攻击?
\u5982\u4f55\u5224\u65ad\u4ea4\u6362\u673a\u662f\u5426\u53d7\u5230ARP\u653b\u51fb\u4ee5\u53ca\u5904\u7406\u65b9\u5f0f\u5982\u4f55\u5224\u65ad\u4ea4\u6362\u673a\u662f\u5426\u53d7\u5230ARP\u653b\u51fb\u4ee5\u53ca\u5904\u7406\u65b9\u5f0f
\u4e00\u3001\u5982\u679c\u7f51\u7edc\u53d7\u5230\u4e86ARP\u653b\u51fb\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u5982\u4e0b\u73b0\u8c61\uff1a
1\u3001\u7528\u6237\u6389\u7ebf\u3001\u9891\u7e41\u65ad\u7f51\u3001\u4e0a\u7f51\u6162\u3001\u4e1a\u52a1\u4e2d\u65ad\u6216\u65e0\u6cd5\u4e0a\u7f51\u3002
2\u3001\u8bbe\u5907CPU\u5360\u7528\u7387\u8f83\u9ad8\u3001\u8bbe\u5907\u6258\u7ba1\u3001\u4e0b\u6302\u8bbe\u5907\u6389\u7ebf\u3001\u8bbe\u5907\u4e3b\u5907\u72b6\u6001\u9707\u8361\u3001\u8bbe\u5907\u7aef\u53e3\u6307\u793a\u706f\u7ea2\u8272\u5feb\u95ea\u3002
3\u3001Ping\u6709\u65f6\u5ef6\u3001\u4e22\u5305\u6216\u4e0d\u901a\u3002
\u5b9a\u4f4dARP\u653b\u51fb\u65f6\uff0c\u8bf7\u5148\u6392\u9664\u94fe\u8def\u3001\u73af\u8def\u6216\u8def\u7531\u95ee\u9898\uff0c\u6392\u9664\u540e\u518d\u6267\u884c\u4e0b\u9762\u7684\u6b65\u9aa4\u3002\u6267\u884c\u8fc7\u7a0b\u4e2d\u8bf7\u4fdd\u5b58\u4ee5\u4e0b\u6b65\u9aa4\u7684\u6267\u884c\u7ed3\u679c\uff0c\u4ee5\u4fbf\u5728\u6545\u969c\u65e0\u6cd5\u89e3\u51b3\u65f6\u5feb\u901f\u6536\u96c6\u548c\u53cd\u9988\u4fe1\u606f\u3002
1\u3001\u5728\u7f51\u5173\u4e0a\u6267\u884c\u547d\u4ee4display cpu-defend statistics all\uff0c\u67e5\u770bARP Request\u3001ARP Reply\u6216ARP Miss\u62a5\u6587\u7684\u201cDrop\u201d\u8ba1\u6570\u662f\u5426\u589e\u957f\u3002
\u5982\u679c\u8ba1\u6570\u4e3a0\uff0c\u8bbe\u5907\u6ca1\u6709\u4e22\u5f03ARP\u62a5\u6587\u3002
\u5982\u679c\u6709\u8ba1\u6570\uff0c\u8868\u793a\u8bbe\u5907\u6536\u5230\u7684ARP\u62a5\u6587\u7531\u4e8e\u8d85\u8fc7\u4e86CPCAR\u7684\u901f\u7387\u9650\u5236\u800c\u88ab\u4e22\u5f03\u3002
\u5982\u679c\u662fARP Miss\u62a5\u6587\u4e22\u5f03\u5f88\u591a\uff0c\u8bbe\u5907\u5f88\u53ef\u80fd\u53d7\u5230\u4e86ARP Miss\u653b\u51fb\u3002
\u5982\u679c\u662fARP Request\u6216ARP Reply\u62a5\u6587\u4e22\u5f03\u5f88\u591a\uff0c\u8bbe\u5907\u5f88\u53ef\u80fd\u53d7\u5230\u4e86ARP Request\u6216ARP Reply\u62a5\u6587\u653b\u51fb\u3002
2\u3001\u5728\u7f51\u5173\u4e0a\u6267\u884c\u547d\u4ee4display arp all\uff0c\u67e5\u770b\u7528\u6237\u7684ARP\u8868\u9879\u662f\u5426\u5b58\u5728\u3002
\u5982\u679cARP\u8868\u9879\u8fd8\u5728\uff0c\u8bf7\u518d\u67e5\u770b\u7528\u6237\u7684ARP\u8868\u9879\uff0c\u7136\u540e\u786e\u5b9a\u662f\u5426\u6709\u7528\u6237\u6216\u7f51\u5173\u7684ARP\u8868\u9879\u88ab\u6539\u53d8\u3002
\u5982\u679c\u662f\u7f51\u5173\u4e0a\u7528\u6237ARP\u8868\u9879\u88ab\u6539\u53d8\uff0c\u8bbe\u5907\u53d7\u5230\u4e86ARP\u6b3a\u9a97\u7f51\u5173\u653b\u51fb\u3002
\u5728\u8bbe\u5907\u4e0e\u7528\u6237\u8fde\u63a5\u7684\u63a5\u53e3\u4e0a\u83b7\u53d6\u62a5\u6587\u5934\uff0c\u5206\u6790ARP\u62a5\u6587\u7684\u6e90\u5730\u5740\uff0c\u627e\u51fa\u653b\u51fb\u8005\u3002
\u5efa\u8bae\u627e\u51fa\u653b\u51fb\u8005\u540e\u8fdb\u884c\u6740\u6bd2\u6216\u5378\u8f7d\u653b\u51fb\u5de5\u5177\u3002\u4e5f\u53ef\u4ee5\u5728\u7f51\u5173\u8bbe\u5907\u4e0a\u914d\u7f6e\u9632\u653b\u51fb\u529f\u80fd\uff0c\u8bf7\u6839\u636e\u60c5\u51b5\u9009\u62e9\u914d\u7f6e\u3002
3\u3001\u7cfb\u7edf\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4arp static\uff0c\u914d\u7f6e\u9759\u6001ARP\u8868\u9879\u3002
\u5982\u679c\u4e0b\u6302\u7528\u6237\u8f83\u5c11\uff0c\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e\u9759\u6001ARP\u8868\u9879\uff0c\u7ed1\u5b9aMAC\u5730\u5740\u548cIP\u5730\u5740\uff0c\u786e\u4fddIP\u5730\u5740\u4e0d\u4f1a\u88ab\u4f2a\u7528\u6237\u76d7\u7528\u3002
4\u3001\u7cfb\u7edf\u89c6\u56fe\u6216\u63a5\u53e3\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4arp anti-attack entry-check { fixed-mac | fixed-all | send-ack } enable\uff0c\u914d\u7f6eARP\u8868\u9879\u56fa\u5316\u529f\u80fd\u3002
fixed-mac\u65b9\u5f0f\u9002\u7528\u4e8e\u7528\u6237MAC\u5730\u5740\u56fa\u5b9a\uff0c\u4f46\u7528\u6237\u63a5\u5165\u4f4d\u7f6e\u9891\u7e41\u53d8\u52a8\u7684\u573a\u666f\u3002\u5f53\u7528\u6237\u4ece\u4e0d\u540c\u63a5\u53e3\u63a5\u5165\u8bbe\u5907\u65f6\uff0c\u8bbe\u5907\u4e0a\u8be5\u7528\u6237\u5bf9\u5e94\u7684ARP\u8868\u9879\u4e2d\u7684\u63a5\u53e3\u4fe1\u606f\u53ef\u4ee5\u53ca\u65f6\u66f4\u65b0\u3002
fixed-all\u65b9\u5f0f\u9002\u7528\u4e8e\u7528\u6237MAC\u5730\u5740\u56fa\u5b9a\uff0c\u5e76\u4e14\u7528\u6237\u63a5\u5165\u4f4d\u7f6e\u76f8\u5bf9\u56fa\u5b9a\u7684\u573a\u666f\u3002
send-ack\u65b9\u5f0f\u9002\u7528\u4e8e\u7528\u6237\u7684MAC\u5730\u5740\u548c\u63a5\u5165\u4f4d\u7f6e\u5747\u9891\u7e41\u53d8\u52a8\u7684\u573a\u666f\u3002
\u4e8c\u3001\u5904\u7406\u65b9\u5f0f\uff1a
1\u3001\u914d\u7f6e\u9ed1\u540d\u5355\u6216\u9ed1\u6d1eMAC\u5bf9\u653b\u51fb\u6e90\u7684\u62a5\u6587\u8fdb\u884c\u4e22\u5f03\u5904\u7406\u3002
\u5982\u679c\u662f\u7528\u6237\u7684\u7f51\u5173ARP\u8868\u9879\u88ab\u6539\u53d8\uff0c\u8bbe\u5907\u53d7\u5230\u4e86ARP\u4eff\u5192\u7f51\u5173\u653b\u51fb\u3002
\u5728\u8bbe\u5907\u4e0e\u7528\u6237\u8fde\u63a5\u7684\u63a5\u53e3\u4e0a\u83b7\u53d6\u62a5\u6587\u5934\uff0c\u5206\u6790ARP\u62a5\u6587\u7684\u6e90\u5730\u5740\uff0c\u627e\u51fa\u653b\u51fb\u8005\u3002
\u5efa\u8bae\u627e\u51fa\u653b\u51fb\u8005\u540e\u8fdb\u884c\u6740\u6bd2\u6216\u5378\u8f7d\u653b\u51fb\u5de5\u5177\u3002\u4e5f\u53ef\u4ee5\u5728\u7f51\u5173\u8bbe\u5907\u4e0a\u914d\u7f6e\u9632\u653b\u51fb\u529f\u80fd\uff0c\u8bf7\u6839\u636e\u60c5\u51b5\u9009\u62e9\u914d\u7f6e\u3002
2\u3001\u5728\u7f51\u5173\u7684\u4e0b\u884c\u63a5\u53e3\u914d\u7f6e\u7aef\u53e3\u9694\u79bb\uff0c\u9632\u6b62\u540c\u4e00VLAN\u7684\u7528\u6237\u6536\u5230\u653b\u51fb\u7684ARP\u3002
\u7cfb\u7edf\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4arp anti-attack gateway-duplicate enable\uff0c\u4f7f\u80fdARP\u9632\u7f51\u5173\u51b2\u7a81\u653b\u51fb\u529f\u80fd\u3002
3\u3001\u5728\u63a5\u53e3\u6216VLAN\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4arp anti-attack check user-bind enable\uff0c\u4f7f\u80fd\u52a8\u6001ARP\u68c0\u6d4b\u529f\u80fd\uff08\u5373\u5bf9ARP\u62a5\u6587\u8fdb\u884c\u7ed1\u5b9a\u8868\u5339\u914d\u68c0\u67e5\u529f\u80fd\uff09\u3002
\u52a8\u6001ARP\u68c0\u6d4b\u529f\u80fd\u4e3b\u8981\u7528\u4e8e\u9632\u5fa1\u4e2d\u95f4\u4eba\u653b\u51fb\u7684\u573a\u666f\uff0c\u907f\u514d\u5408\u6cd5\u7528\u6237\u7684\u6570\u636e\u88ab\u4e2d\u95f4\u4eba\u7a83\u53d6\u3002
4\u3001\u5728\u7cfb\u7edf\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4arp anti-attack packet-check { ip | dst-mac | sender-mac }*\uff0c\u4f7f\u80fdARP\u62a5\u6587\u5408\u6cd5\u6027\u68c0\u67e5\u529f\u80fd\uff0c\u5e76\u6307\u5b9aARP\u62a5\u6587\u5408\u6cd5\u6027\u68c0\u67e5\u9879\u3002
\u914d\u7f6e\u540e\uff0c\u8fd8\u9700\u5e94\u7528\u8be5\u9632\u653b\u51fb\u7b56\u7565\u624d\u80fd\u751f\u6548\u3002
\u7528\u6237\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4display arp anti-attack configuration arp-speed-limit\uff0c\u67e5\u770b\u662f\u5426\u914d\u7f6e\u4e86ARP\u62a5\u6587\u9650\u901f\u3002
\u7cfb\u7edf\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4arp speed-limit source-ip [ ip-address ] maximum maximum\uff0c\u8c03\u6574\u6839\u636e\u6e90IP\u5730\u5740\u8fdb\u884cARP\u62a5\u6587\u9650\u901f\u7684\u9650\u901f\u503c\u3002
\u7cfb\u7edf\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4arp speed-limit source-mac [ mac-address ] maximum maximum\uff0c\u8c03\u6574\u6839\u636e\u6e90MAC\u5730\u5740\u8fdb\u884cARP\u9650\u901f\u7684\u9650\u901f\u503c\u3002
\u7cfb\u7edf\u89c6\u56fe\u3001VLAN\u89c6\u56fe\u6216\u63a5\u53e3\u89c6\u56fe\u4e0b\u6267\u884c\u547d\u4ee4arp anti-attack rate-limit packet packet-number\uff0c\u8c03\u6574ARP\u62a5\u6587\u7684\u9650\u901f\u503c\u3002
\u53ef\u4ee5\u901a\u8fc7\u67e5\u770bARP\u62a5\u6587\u7684CPCAR\u7edf\u8ba1\u60c5\u51b5\u786e\u8ba4\u8bbe\u5907\u662f\u5426\u53d7\u5230\u653b\u51fb\u3002
display cpu-defend arp-request statistics all
display cpu-defend arp-reply statistics all
\u901a\u8fc7\u4e0a\u8ff0\u547d\u4ee4\u53c2\u770bARP\u62a5\u6587\u7684\u7edf\u8ba1\u4fe1\u606f\uff0c\u5982\u679cDrop\u6570\u503c\u5f88\u591a\uff0c\u5e76\u4e14\u6301\u7eed\u589e\u957f\uff0c\u589e\u957f\u8f83\u5feb\uff0c\u57fa\u672c\u53ef\u4ee5\u786e\u8ba4\u8bbe\u5907\u53d7\u5230ARP\u653b\u51fb\u4e86\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4ee5arp-request\u62a5\u6587\u7684\u653b\u51fb\u5c45\u591a\u3002
\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4ee5arp-request\u62a5\u6587\u7684\u653b\u51fb\u5c45\u591a\u3002
\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u9002\u5f53\u8c03\u6574\u62a5\u6587\u7684CPCAR\u503c\uff0c\u4e00\u822c\u653e\u5927\u5230128Kbps\u5373\u53ef\uff0c\u8fd8\u9700\u8981\u6574\u4f53\u8003\u8651CPU\u7684\u5229\u7528\u7387\u60c5\u51b5\u3002CPCAR\u503c\u653e\u5927\u4e86\uff0c\u4e0a\u9001CPU\u7684\u62a5\u6587\u5c31\u53ef\u591a\u4e86\uff0c\u80af\u5b9a\u4f1a\u589e\u52a0CPU\u7684\u8d1f\u62c5\u3002
\u5728\u53d7\u5230\u653b\u51fb\u7684\u60c5\u51b5\u4e0b\uff0c\u5173\u952e\u8fd8\u662f\u8981\u786e\u8ba4\u653b\u51fb\u6e90\u3002\u53ef\u4ee5\u901a\u8fc7\u6293\u5305\u6216\u6253\u5f00\u8c03\u8bd5\u5f00\u5173\u67e5\u770b\u653b\u51fb\u6e90\uff0c\u7136\u540e\u914d\u7f6e\u9ed1\u540d\u5355\u5c06\u653b\u51fb\u6e90\u5c4f\u853d\u3002
\u8c03\u8bd5\u624b\u6bb5\uff1a
\u6253\u5f00ARP\u7684\u8c03\u8bd5\u5f00\u5173\uff0cdebugging arp packet\uff0c\u4e00\u6bb5\u65f6\u95f4\u540e\u5173\u95ed\uff0c\u5982\u679c\u8c03\u8bd5\u4fe1\u606f\u592a\u591a\uff0c\u53ef\u4ee5\u6253\u5f0010\u79d2\u5de6\u53f3\u5173\u95ed\uff0c\u6700\u957f30\u79d2\u5373\u53ef\u3002
\u4ece\u8c03\u8bd5\u4fe1\u606f\u6216\u6293\u5305\u4e2d\u786e\u8ba4\uff0c\u90a3\u4e2a\u6e90MAC\u5730\u5740\u53d1\u9001\u7684ARP\u62a5\u6587\u8fc7\u591a\uff0c\u8be5MAC\u5730\u5740\u662f\u5426\u662f\u6b63\u5e38\u7528\u6237\u3002\u5982\u679c\u4e0d\u662f\uff0c\u53ef\u4ee5\u914d\u7f6e\u9ed1\u540d\u5355\u5c06\u8be5MAC\u5730\u5740\u8fc7\u6ee4\u3002
绛旓細鍙互閫氳繃鏌ョ湅ARP鎶ユ枃鐨凜PCAR缁熻鎯呭喌纭璁惧鏄惁鍙楀埌鏀诲嚮銆俤isplay cpu-defend arp-request statistics all display cpu-defend arp-reply statistics all 閫氳繃涓婅堪鍛戒护鍙傜湅ARP鎶ユ枃鐨勭粺璁′俊鎭紝濡傛灉Drop鏁板煎緢澶氾紝骞朵笖鎸佺画澧為暱锛屽闀胯緝蹇紝鍩烘湰鍙互纭璁惧鍙楀埌ARP鏀诲嚮浜嗐傞氬父鎯呭喌涓嬶紝浠rp-request鎶ユ枃鐨勬敾鍑诲眳澶...
绛旓細1銆佸湪缃戝叧涓婃墽琛屽懡浠isplay cpu-defend statistics all锛屾煡鐪婣RP Request銆丄RP Reply鎴朅RP Miss鎶ユ枃鐨勨淒rop鈥濊鏁版槸鍚﹀闀銆傚鏋滆鏁颁负0锛岃澶囨病鏈変涪寮傾RP鎶ユ枃銆傚鏋滄湁璁℃暟锛岃〃绀鸿澶囨敹鍒扮殑ARP鎶ユ枃鐢变簬瓒呰繃浜咰PCAR鐨勯熺巼闄愬埗鑰岃涓㈠純銆傚鏋滄槸ARP Miss鎶ユ枃涓㈠純寰堝锛岃澶囧緢鍙兘鍙楀埌浜咥RP Miss鏀诲嚮銆傚鏋滄槸ARP...
绛旓細1銆佺湅涓嬩氦鎹㈡満鐨勬寚绀虹伅鏄笉鏄媯闂 2銆佹湁鍙兘鏄氦鎹㈡満鎺ユ垚浜嗙幆璺紝涔熶細瀵艰嚧棰戠箒鏂綉锛堟鏌ヤ笅A浜ゆ崲鏈哄拰B浜ゆ崲鏈轰箣闂寸殑缃戠嚎杩炴帴鎯呭喌锛孉鐨勭綉绾挎帴鍦˙涓婏紝鐒跺悗B鐨勭綉绾挎帴鍦ˋ涓婏紝浼氬嚭鐜扮幆璺級3銆佹姄鍖呭伐鍏穡ireshark ,鍙互鐪嬪埌鎵鏈変俊鎭兘鍚戞煇涓涓紙鎴栧嚑涓級鍥哄畾IP鍙戦佷俊鎭紝杩欏嚑涓浐瀹欼P鐨勪富鏈哄氨鏈夊彲鑳戒腑...
绛旓細绗竴瑙傚療浣犵殑缃戠粶鐜鏄惁涓嶇ǔ瀹氾紝绗簩鏌ョ湅浜ゆ崲鏈鏃ュ織锛岀涓夋煡鐪嬩氦鎹㈡満绔彛鏁版嵁鍖呮祦閲
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