为什么在接口下配置了arp-proxy enable命令，arp代理功能不能生效 怎样看arp代理是否开启
\u4ee3\u7406ARP\u7684\u5b9e\u4f8b\u914d\u7f6e\u4ee3\u7406ARP \uff08proxy ARP\uff09\uff0c\u53c8\u53eb\u6742\u9519ARP\uff08promiscuous ARP\uff09\uff0c\u5b83\u662f\u4e00\u79cdIP\u7f51\u7edc\u5730\u5740\u590d\u7528\u6280\u672f\u3002\u5728\u4f01\u4e1a\u7f51\u4e2d\u6709\u4e9b\u7528\u6237\u4f1a\u7528\u5230\u6b64\u6280\u672f\u3002\u4ee3\u7406ARP\u7684\u539f\u7406\u5982\u56fe1\uff1a\u4e3b\u7f51\u7edc\u3002\u8fd0\u884cARP\u9690\u85cf\u7f51\u7edc\u3002\u9690\u85cf\u4e3b\u673a\u56fe\u4e2d\u7684\u4e3b\u7f51\u7edc\u548c\u9690\u85cf\u7f51\u7edc\u5171\u4eab\u4e00\u4e2a\u7f51\u7edc\u5730\u5740\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e3b\u7f51\u7edc\u548c\u9690\u85cf\u7f51\u7edc\u5728\u4e00\u4e2a\u5730\u5740\u6bb5\u4e0a\u3002\u4ee3\u7406ARP\u8981\u6c42\u5728\u4e3b\u7f51\u7edc\u91c7\u7528ARP\u534f\u8bae\u8fdb\u884cIP\u5730\u5740\u00e0\u7269\u7406\u5730\u5740\u6620\u5c04\uff0c\u5f53\u4e3b\u7f51\u7edc\u4e0a\u5404\u53f0\u4e3b\u673a\u8c03\u7528ARP\u89e3\u6790\u9690\u85cf\u7f51\u7edc\u4e0a\u4e3b\u673a\u7684\u7269\u7406\u5730\u5740\u65f6\uff0c\u7f51\u5173G\u4ee3\u66ff\u4e3b\u673a\u54cd\u5e94\uff0c\u7ed9\u51fa\u7684\u7269\u7406\u5730\u5740\u662fG\u672c\u8eab\u7684\u7269\u7406\u5730\u5740\uff0c\u7531G\u6765\u5e94\u7b54\u3002\u800c\u7f51\u5173G\u8981\u6c42\u5bf9\u9690\u85cf\u7f51\u7edc\u7684\u5404\u4e3b\u673a\u4e86\u5982\u6307\u638c\uff0c\u8fd9\u6837\u6240\u6709\u8fdb\u5165\u9690\u85cf\u7f51\u7edc\u7684\u6570\u636e\u62a5\u6587\u90fd\u5148\u9001\u5230\u7f51\u5173G\uff0c\u7f51\u5173G\u5728\u5c06\u62a5\u6587\u9001\u5f80\u5e94\u8be5\u5230\u8fbe\u7684\u4e3b\u673a\uff0c\u540c\u6837\u7f51\u5173G\u4e5f\u638c\u63e1\u4e3b\u7f51\u7edc\u4e0a\u7684\u4e3b\u673a\uff0c\u4ee5\u4fbf\u5bf9\u5916\u51fa\u7684\u6570\u636e\u8fdb\u884c\u5408\u9002\u7684\u64cd\u4f5c\u3002\u4ee3\u7406ARP\u6280\u672f\u6d89\u53ca\u5230IP \u5730\u5740\u548c\u7269\u7406\u5730\u5740\u4e24\u4e2a\u65b9\u9762\uff0c\u4e00\u65b9\u9762\u4ee3\u7406ARP\u8981\u7528IP\u5bfb\u5f84\uff0c\u56e0\u4e3a\u5b83\u8981\u5224\u65ad\u5bf9\u90a3\u4e9bARP\u8bf7\u6c42\u4f5c\u51fa\u54cd\u5e94\uff1b\u53e6\u4e00\u65b9\u9762\u4ee3\u7406ARP\u53c8\u8981\u5728\u7f51\u5173G\u5efa\u7acb\u4e00\u5f20IP-\u7269\u7406\u5730\u5740\u6620\u5c04\u8868\uff0c\u5b83\u662f\u76f4\u63a5\u53c2\u4e0e\u7269\u7406\u4f20\u8f93\u7684\u3002\u8bf4\u5b83\u662f\u4e00\u79cd\u7f51\u7edc\u5730\u5740\u590d\u7528\u6280\u672f\uff0c\u662f\u56e0\u4e3a\u5728\u4ee3\u7406ARP\u6280\u672f\u4e2d\uff0c\u4e00\u4e2a\u7269\u7406\u5730\u5740\u5bf9\u5e94\u4e8e\u82e5\u5e72\u4e2aIP\u5730\u5740\uff0c\u4e8c\u8005\u4e0d\u662f\u4e00\u4e00\u5bf9\u5e94\u7684\uff0c\u8fd9\u5728\u534f\u8bae\u4e0a\u6765\u8bf4\u662f\u4e0d\u5408\u6cd5\u7684 \uff0c\u56e0\u4e3a\u8fd9\u6837\u4f1a\u5f15\u8d77\u5b89\u5168\u95ee\u9898\uff0c\u5982\u679c\u67d0\u8ba1\u7b97\u673a\u58f0\u79f0\u81ea\u5df1\u662f\u53e6\u5916\u4e00\u53f0\u8ba1\u7b97\u673a\uff0c\u5c31\u662f\u5bf9\u4e0d\u5c5e\u4e8e\u81ea\u5df1\u7684ARP\u8bf7\u6c42\u56de\u7b54\u81ea\u5df1\u7684\u7269\u7406\u5730\u5740\uff0c\u7136\u540e\u975e\u6cd5\u63a5\u53d7\u5206\u7ec4\uff0c\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u4e0d\u5b89\u5168\u7684\u56e0\u7d20\uff0c\u6709\u4e9bARP\u5b9e\u73b0\u5f15\u5165\u4e86\u4e13\u95e8\u7684\u5e94\u4ed8\u673a\u5236\uff0c\u4e00\u65e6\u53d1\u73b0\u4e24\u4e2aIP\u5730\u5740\u6620\u5c04\u5230\u540c\u4e00\u7269\u7406\u5730\u5740\uff0c\u7acb\u5373\u53d1\u51fa\u8b66\u544a\uff0c\u63d0\u9192\u7ba1\u7406\u5458\u91c7\u53d6\u63aa\u65bd\u3002\u5728\u4ee3\u7406ARP\u6280\u672f\u4e2d\uff0c\u5b83\u4e0d\u5141\u8bb8\u4ea7\u751f\u8b66\u544a\uff0c\u5426\u5219\u8b66\u544a\u62a5\u6587\u592a\u591a\uff0c\u5f15\u8d77\u4e0d\u5fc5\u8981\u7684\u9ebb\u70e6\u3002\u5728\u4ee3\u7406ARP\u6280\u672f\u4e2d\u4e00\u4e2a\u91cd\u8981\u7684\u6982\u5ff5\u662f\u201c\u4fe1\u7528\u201d\uff08trust\uff09\uff0c\u5b83\u7684\u57fa\u672c\u601d\u60f3\u5c31\u662f\uff1a\u6240\u6709\u53c2\u4e0eARP\u7684\u673a\u5668\u8981\u4e92\u76f8\u534f\u4f5c\uff0c\u4e0d\u80fd\u6709\u6b3a\u9a97\u884c\u4e3a\uff0c\u56e0\u6b64\u6240\u6709ARP\u54cd\u5e94\u90fd\u662f\u5408\u6cd5\u7684\u3002\u8fd9\u79cd\u6280\u672f\u5e7f\u6cdb\u5e94\u7528\u5728\u8def\u7531\u5668\u4e0a\uff0c\u5728\u4e2d\u5fc3\u5c40\u57df\u7f51\u8def\u7531\u5668\u7684\u5c40\u57df\u7f51\u7aef\u53e3\u8bbe\u7f6e\u4ee3\u7406ARP\uff0c\u4e00\u4e9b\u62e8\u53f7\u7528\u6237\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e2d\u5fc3\u5c40\u57df\u7f51\u7f51\u6bb5\u6765\u548c\u4e2d\u5fc3\u901a\u4fe1\uff0c\u5982\u679c\u8def\u7531\u5668\u8fd8\u652f\u6301\u52a8\u6001IP\u5730\u5740\u6c60\uff0c\u90a3\u4e48\u6574\u4e2a\u7f51\u7edc\u914d\u7f6e\u5c31\u76f8\u5f53\u7b80\u5355\u4e86\u3002\u4e0a\u6d77\u535a\u8fbe\u6570\u636e\u901a\u4fe1\u6709\u9650\u516c\u53f8\u751f\u4ea7\u7684BDCOM3000\u7cfb\u5217\u8def\u7531\u5668\u5c31\u652f\u6301\u8fd9\u79cd\u7528\u6cd5\uff0c\u5178\u578b\u7684\u5e94\u7528\u5982\u4e0b\uff1a\u5728\u8fd9\u4e2a\u7f51\u7edc\u4e2d\uff0c\u8def\u7531\u5668\u4f5c\u4e3a\u62e8\u53f7\u8bbf\u95ee\u670d\u52a1\u5668\u4f7f\u7528\uff0c\u4e3b\u8981\u7684\u914d\u7f6e\u5de5\u4f5c\u96c6\u4e2d\u5230\u4e2d\u5fc3\u8def\u7531\u5668BDC0M3161\u4e0a\u9762\uff0c\u5728E0\u7aef\u53e3\u4f7f\u7528\u4ee3\u7406ARP\u6280\u672f\uff0c\u8def\u7531\u5668\u4e0a\u914d\u7f6e\u52a8\u6001IP\u5730\u5740\u6c60\uff0c\u8fd9\u6837\u8fdc\u7a0b\u62e8\u53f7\u8ba1\u7b97\u673a\u53ea\u9700\u8981\u914d\u7f6e\u62e8\u53f7\u7f51\u7edc\u4e2d\u7684\u7535\u8bdd\u53f7\u7801\u5c31\u80fd\u548c\u4e2d\u5fc3\u901a\u4fe1\u4e86\u3002BDCOM3161\u76f8\u5f53\u4e8e cisco\u76842511\uff0c\u5177\u670916\u4e2a\u5f02\u6b65\u7aef\u53e3\uff0c\u8fd8\u67093\u4e2a\u540c\u6b65\u7aef\u53e3\uff0c\u6bcf\u4e2a\u7aef\u53e3\u6700\u9ad8\u901f\u7387\uff08\u540c\u6b65\uff09\u90fd\u662f2M\uff0c\u8fd93\u4e2a\u7aef\u53e3\u4e5f\u652f\u6301\u5f02\u6b65\uff08\u6839\u636e\u9700\u8981\u5728\u8def\u7531\u5668\u7aef\u53e3\u914d\u7f6e\u540c\u6b65/\u5f02\u6b65\uff09\u3002\u5982\u679c\u5168\u7528\u6210\u5f02\u6b65\uff0c\u53ef\u4ee5\u63d0\u4f9b19\u4e2a\u5f02\u6b65\u53e3\u3002\u5728\u9752\u6d77\u7701\u67d0\u94f6\u884c\u5c31\u6709\u8fd9\u79cd\u7528\u6cd5\u3002\u8def\u7531\u5668\u914d\u7f6e\u5982\u4e0b\uff1anodename BDCOM3161 \u8bbe\u7f6e\u8def\u7531\u5668\u540d\u5b57ippool add remoteip 192.168.1.100 16 \u8bbe\u7f6eIP\u5730\u5740\u6c60\uff0c\u540d\u5b57\u4e3aremoteip \u4ece 192.168.1.100 \u5f00\u59cb\u5206\u914d\uff0c\u5171\u670916\u4e2a\u5730\u5740\u53ef\u4f9b\u5206\u914de0 \u8fdb\u5165\u4ee5\u592a\u7f51\u7aef\u53e3arpproxy-arp enable \u5c06ARP\u4ee3\u7406\u6253\u5f00ip add 192.168.1.254 255.255.255.0 \u8bbe\u7f6e\u4ee5\u592a\u7f51IP\u5730\u5740quit \u9000\u51faE0\u7aef\u53e3a0 \u8fdb\u5165A0\u7aef\u53e3encapsulate ppp \u5c06A0\u7aef\u53e3\u5c01\u88c5\u6210PPP\u534f\u8baeip add 192.168.1.254 255.255.255.0 \u8bbe\u7f6eIP\u5730\u5740 \uff08\u6b64IP\u5730\u5740\u548cE0\u7aef\u53e3\u5730\u5740\u76f8\u540c\uff09line dial \u5c06\u6b64\u7aef\u53e3\u6539\u6210\u62e8\u53f7\u7ebfidletime 300 \u8bbe\u7f6e\u6302\u673a\u65f6\u95f4\uff08\u5f53300\u79d2\u6ca1\u6709 \u4e1a\u52a1\u6d41\u91cf\u65f6\u8def\u7531\u5668\u5c06MODEM\u6302\u65ad\uff09ppp auth pap \u5728\u6b64\u7aef\u53e3\u8fdb\u884cPAP\u8ba4\u8bc1\u7ed9\u8fdc\u7a0b\u8ba1\u7b97\u673a\u5206\u914d\u5730\u5740quit \u9000\u51faA0\u7aef\u53e3a1encapsulate pppip add 192.168.1.254 255.255.255.0line dialidletime 300ppp auth papppp ipcp pool remoteip \u6307\u5b9a\u6b64\u7aef\u53e3\u4f7f\u7528\u5730\u5740\u6c60remoteip \u7ed9\u8fdc\u7a0b\u8ba1\u7b97\u673a\u5206\u914d\u5730\u5740quita2encapsulate pppip add 192.168.1.254 255.255.255.0line dialidletime 300ppp auth papppp ipcp pool remoteipquita3encapsulate pppip add 192.168.1.254 255.255.255.0line dialidletime 300ppp auth papppp ipcp pool remoteipquit\u2026\u2026a15encapsulate pppip add 192.168.1.254 255.255.255.0line dialidletime 300ppp auth papppp ipcp pool remoteipquituser add bdcom abcd \u4e3aPAP\u8ba4\u8bc1\u52a0\u7528\u6237\u5e10\u53f7\uff08bdcom\uff09\u548c\u53e3\u4ee4\uff08abcd)user add bdcom1 dcba \u540c\u4e0a\u6b64\u5e10\u53f7\u53ef\u4ee5\u6839\u636e\u9700\u8981\u6dfb\u52a0\u591a\u4e2aicmp redirect disable \u5c06internet\u63a7\u5236\u62a5\u6587\u534f\u8bae\u7684\u91cd\u5b9a\u5411\u4fe1\u606f\u7981\u6b62 \u8fdc\u7a0b\u62e8\u53f7\u8ba1\u7b97\u673a\u53ea\u9700\u914d\u7f6e\u62e8\u53f7\u7f51\u7edc\u7684\u7535\u8bdd\u53f7\u7801\uff0c\u4ece\u7ba1\u7406\u5458\u5904\u5f97\u5230\u5e10\u53f7\u548c\u5bc6\u7801\uff0cIP\u5730\u5740\u7531\u8def\u7531\u5668\u81ea\u52a8\u5206\u914d\u5373\u53ef\u3002\u5b9e\u4f8b\u914d\u7f6e\uff1a\u5982\u56fe\uff0c\u4ea4\u6362\u673a\u8fde\u63a5\u4e24\u53f0PC\uff08A\u548cB\uff09\uff0c\u6700\u521d\u7684\u65f6\u5019\u4ed6\u4eec\u90fd\u5728\u4e00\u4e2avlan1\u5185\uff0c\u5206\u522b\u914d\u7f6eIP\u5730\u5740 172.16.1.2/16\u548c172.16.2.2/16 \uff0c\u5747\u672a\u914d\u7f6e\u7f51\u5173\uff0c\u6b64\u65f6\u53ef\u4ee5Ping\u540c\u5bf9\u65b9\u3002\u5c06A\u52a0\u5165vlan1 \uff0cvlanif\u914dIP\uff1a172.16.1.1/24\u5c06B\u52a0\u5165vlan2 \uff0cvlanif\u914dIP\uff1a172.16.2.1/24\u6b64\u65f6ApingB\u662fping\u4e0d\u901a\u7684\u3002\u539f\u56e0\u731c\u60f3\uff1a\u6ca1\u6709\u914d\u7f6e\u7f51\u5173\u4e5f\u6ca1\u6709\u914d\u7f6e\u4ee3\u7406ARP\uff0c\u6240\u4ee5ping\u4e0d\u901a\u5f53\u6211\u914d\u7f6e\u4e0a\u4e24\u4e2a\u7aef\u53e3\u7684\u4ee3\u7406ARP\uff0c\u6b64\u65f6\u53d1\u73b0\u8fd8\u662fPing\u4e0d\u540c\u3002\u6b64\u65f6\u67e5\u770b\u4e86A\u7684ARP\u8868\uff0c\u53d1\u73b0\u8868\u4e2d\u8bb0\u5f55172.16.2.2\u7684MAC\u5730\u5740\u662fB\u7684\u5730\u5740\u3002\u6b64\u65f6A\u53d1\u51fa\u53bb\u7684\u5305\u4e2d\u5c01\u88c5\u7684MAC\u5730\u5740\u662fB\u7684\uff0c\u5f53vlanif\u6536\u5230\u8be5\u5e27\u65f6\uff0c\u4f1a\u4e22\u5f03\u8be5\u62a5\u6587\u5c06A\u7684ARP\u8868\u6e05\u7a7a\uff08arp \u2013d\uff09\uff0c\u6b64\u65f6\u518dpingB\uff0c\u53d1\u73b0\u53ef\u4ee5Ping\u901a\u4e86\uff0cA\u4e2d\u8bb0\u5f55\u7684\u5173\u4e8e172.16.2.2\u7684MAC\u5730\u5740\u5df2\u7ecf\u662fvlanif1 \u7684MAC\u4e86\u3002
\u4ea4\u6362\u673a\u8fde\u63a5\u4e24\u53f0PC\uff08A\u548cB\uff09\uff0c\u6700\u521d\u7684\u65f6\u5019\u4ed6\u4eec\u90fd\u5728\u4e00\u4e2avlan1\u5185\uff0c\u5206\u522b\u914d\u7f6eIP\u5730\u5740 172.16.1.2/16\u548c172.16.2.2/16 \uff0c\u5747\u672a\u914d\u7f6e\u7f51\u5173\uff0c\u6b64\u65f6\u53ef\u4ee5Ping\u540c\u5bf9\u65b9\u3002
\u5c06A\u52a0\u5165vlan1 \uff0cvlanif\u914dIP\uff1a172.16.1.1/24\u3002
\u5c06B\u52a0\u5165vlan2 \uff0cvlanif\u914dIP\uff1a172.16.2.1/24\uff0c\u6b64\u65f6ApingB\u662fping\u4e0d\u901a\u7684\u3002
\u6ca1\u6709\u914d\u7f6e\u7f51\u5173\u4e5f\u6ca1\u6709\u914d\u7f6e\u4ee3\u7406ARP\uff0c\u6240\u4ee5ping\u4e0d\u901a\u3002
\u5f53\u914d\u7f6e\u4e0a\u4e24\u4e2a\u7aef\u53e3\u7684\u4ee3\u7406ARP\uff0c\u6b64\u65f6\u53d1\u73b0\u8fd8\u662fPing\u4e0d\u540c\u3002
\u6b64\u65f6\u67e5\u770b\u4e86A\u7684ARP\u8868\uff0c\u53d1\u73b0\u8868\u4e2d\u8bb0\u5f55172.16.2.2\u7684MAC\u5730\u5740\u662fB\u7684\u5730\u5740\u3002A\u53d1\u51fa\u53bb\u7684\u5305\u4e2d\u5c01\u88c5\u7684MAC\u5730\u5740\u662fB\u7684\uff0c\u5f53vlanif\u6536\u5230\u8be5\u5e27\u65f6\uff0c\u4f1a\u4e22\u5f03\u8be5\u62a5\u6587\u3002
\u5c06A\u7684ARP\u8868\u6e05\u7a7a\uff08arp \u2013d\uff09\uff0c\u6b64\u65f6\u518dpingB\uff0c\u53d1\u73b0\u53ef\u4ee5Ping\u901a\u4e86\uff0cA\u4e2d\u8bb0\u5f55\u7684\u5173\u4e8e172.16.2.2\u7684MAC\u5730\u5740\u5df2\u7ecf\u662fvlanif1 \u7684MAC\u4e86\u3002\u5373\u4e3aarp\u4ee3\u7406\u5f00\u542f\u3002
\u3000\u3000\u4ee3\u7406ARP\u662fARP\u534f\u8bae\u7684\u4e00\u4e2a\u53d8\u79cd\u3002 \u5bf9\u4e8e\u6ca1\u6709\u914d\u7f6e\u7f3a\u7701\u7f51\u5173\u7684\u8ba1\u7b97\u673a\u8981\u548c\u5176\u4ed6\u7f51\u7edc\u4e2d\u7684\u8ba1\u7b97\u673a\u5b9e\u73b0\u901a\u4fe1\uff0c\u7f51\u5173\u6536\u5230\u6e90\u8ba1\u7b97\u673a\u7684 ARP \u8bf7\u6c42\u4f1a\u4f7f\u7528\u81ea\u5df1\u7684 MAC \u5730\u5740\u4e0e\u76ee\u6807\u8ba1\u7b97\u673a\u7684 IP\u5730\u5740\u5bf9\u6e90\u8ba1\u7b97\u673a\u8fdb\u884c\u5e94\u7b54\u3002\u4ee3\u7406ARP\u5c31\u662f\u5c06\u4e00\u4e2a\u4e3b\u673a\u4f5c\u4e3a\u5bf9\u53e6\u4e00\u4e2a\u4e3b\u673aARP\u8fdb\u884c\u5e94\u7b54\u3002\u5b83\u80fd\u4f7f\u5f97\u5728\u4e0d\u5f71\u54cd\u8def\u7531\u8868\u7684\u60c5\u51b5\u4e0b\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684Router\uff0c\u4f7f\u5f97\u5b50\u7f51\u5bf9\u8be5\u4e3b\u673a\u6765\u8bf4\u53d8\u5f97\u66f4\u900f\u660e\u5316\u3002
l 路由式Proxy ARP
设备接收arp请求报文，目的ip地址和入接口配置的ip地址不在同一个网段，但是设备上存在到这个ip地址的路由，路由出接口和入接口不是同一个接口，这种情况下接口配置的路由式arp代理功能生效，设备将用自己的MAC地址作为源，回复arp应答报文。
l VLAN内Proxy ARP
设备接收arp请求报文，目的ip地址和入接口配置的IP地址在同一个网段，此时接口配置的vlan内arp代理功能起作用。
l VLAN间Proxy ARP
和vlan内的arp代理功能类似，应用在super-vlan下才有意义，实现跨vlan的代理。设备接收arp请求报文，目的ip地址和入接口配置的IP地址在同一个网段，此时接口配置的vlan间代理功能起作用，但是如果目的端本来和源端就是在同一个vlan内，不做代理。
无论哪种代理，都要求arp请求报文的源IP和接口地址在同一个网段。
通常使用的arp代理功能是vlan内的代理，因此，应该配置命令arp-proxy inner-sub-vlan-proxy enable，而不是arp-proxy enable命令。
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