netstat\u547d\u4ee4\u662f\u4e00\u4e2a\u76d1\u63a7TCP\/IP\u7f51\u7edc\u7684\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u663e\u793a\u8def\u7531\u8868\u3001\u5b9e\u9645\u7684\u7f51\u7edc\u8fde\u63a5\u4ee5\u53ca\u6bcf\u4e00\u4e2a\u7f51\u7edc\u63a5\u53e3\u8bbe\u5907\u7684\u72b6\u6001\u4fe1\u606f\uff0c\u5728\u6211\u7684\u8ba1\u7b97\u673a\u4e0a\u6267\u884cnetstat\u540e\uff0c\u5176\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a
\nActive Internet connections (w\/o servers)
\nProto Recv-Q Send-Q Local Address Foreign Address State
\ntcp 0 2 210.34.6.89:telnet 210.34.6.96:2873 ESTABLISHED
\ntcp 296 0 210.34.6.89:1165 210.34.6.84:netbios-ssn ESTABLISHED
\ntcp 0 0 localhost.localdom:9001 localhost.localdom:1162 ESTABLISHED
\ntcp 0 0 localhost.localdom:1162 localhost.localdom:9001 ESTABLISHED
\ntcp 0 80 210.34.6.89:1161 210.34.6.10:netbios-ssn CLOSE
\nActive UNIX domain sockets (w\/o servers)
\nProto RefCnt Flags Type State I-Node Path
\nunix 1 [ ] STREAM CONNECTED 16178 @000000dd
\nunix 1 [ ] STREAM CONNECTED 16176 @000000dc
\nunix 9 [ ] DGRAM 5292 \/dev\/log
\nunix 1 [ ] STREAM CONNECTED 16182 @000000df
\n\u4ece\u6574\u4f53\u4e0a\u770b\uff0cnetstat\u7684\u8f93\u51fa\u7ed3\u679c\u53ef\u4ee5\u5206\u4e3a\u4e24\u4e2a\u90e8\u5206\uff0c\u4e00\u4e2a\u662fActive Internet connections\uff0c\u79f0\u4e3a\u6709\u6e90TCP\u8fde\u63a5\uff0c\u53e6\u4e00\u4e2a\u662fActive UNIX domain sockets\uff0c\u79f0\u4e3a\u6709\u6e90Unix\u57df\u5957\u63a5\u53e3\u3002\u5728\u4e0a\u9762\u7684\u8f93\u51fa\u7ed3\u679c\u4e2d\uff0c\u7b2c\u4e00\u90e8\u5206\u67095\u4e2a\u8f93\u51fa\u7ed3\u679c\uff0c\u663e\u793a\u6709\u6e90TCP\u8fde\u63a5\u7684\u60c5\u51b5\uff0c\u800c\u7b2c\u4e8c\u90e8\u5206\u7684\u8f93\u51fa\u7ed3\u679c\u663e\u793a\u7684\u662fUnix\u57df\u5957\u63a5\u53e3\u7684\u8fde\u63a5\u60c5\u51b5\u3002Proto\u663e\u793a\u8fde\u63a5\u4f7f\u7528\u7684\u534f\u8bae\uff1bRefCnt\u8868\u793a\u8fde\u63a5\u5230\u672c\u5957\u63a5\u53e3\u4e0a\u7684\u8fdb\u7a0b\u53f7\uff1bTypes\u663e\u793a\u5957\u63a5\u53e3\u7684\u7c7b\u578b\uff1bState\u663e\u793a\u5957\u63a5\u53e3\u5f53\u524d\u7684\u72b6\u6001\uff1bPath\u8868\u793a\u8fde\u63a5\u5230\u5957\u63a5\u53e3\u7684\u5176\u5b83\u8fdb\u7a0b\u4f7f\u7528\u7684\u8def\u5f84\u540d\u3002
\n\u4e8b\u5b9e\u4e0a\uff0cnetstat\u662f\u82e5\u5e72\u4e2a\u5de5\u5177\u7684\u6c47\u603b\u3002
\n\u25c6 \u663e\u793a\u8def\u7531\u8868
\n\u5728\u968f- r\u6807\u8bb0\u4e00\u8d77\u8c03\u7528n e t s t a t\u65f6\uff0c\u5c06\u663e\u793a\u5185\u6838\u8def\u7531\u8868\uff0c\u5c31\u50cf\u6211\u4eec\u5229\u7528r o u t e\u547d\u4ee4\u4e00\u6837\u3002\u4ea7\u751f\u7684\u8f93\u51fa\u5982\u4e0b\uff1a
\n[root@machine1 \/]$ netstat -nr
\nKernel IP routing table
\nDestination Gateway Genmask Flags MSS Window irtt Iface
\n210.34.6.0 0.0.0.0 255.255.255.128 U 0 0 0 eth0
\n192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
\n127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
\n0.0.0.0 210.34.6.2 0.0.0.0 UG 0 0 0 eth0
\n– n \u9009\u9879\u4ee4netstat\u4ee5\u70b9\u5206\u56db\u6bb5\u5f0f\u7684\u5f62\u5f0f\u8f93\u51faIP\u5730\u5740\uff0c\u800c\u4e0d\u662f\u8c61\u5f81\u6027\u7684\u4e3b\u673a\u540d\u548c\u7f51\u7edc\u540d\u3002\u5982\u679c\u60f3\u907f\u514d\u901a\u8fc7\u7f51\u7edc\u67e5\u627e\u5730\u5740\uff08\u6bd4\u5982\u907f\u5f00DNS\u6216NIS\u670d\u52a1\u5668\uff09\uff0c\u8fd9\u4e00\u70b9\u662f\u7279\u522b\u6709\u7528\u7684\u3002
\nnetstat\u8f93\u51fa\u7ed3\u679c\u4e2d\uff0c\u7b2c\u4e8c\u5217\u5c55\u793a\u7684\u662f\u8def\u7531\u6761\u76ee\u6240\u6307\u7684\u7f51\u5173\uff0c\u5982\u679c\u6ca1\u6709\u4f7f\u7528\u7f51\u5173\uff0c\u5c31\u4f1a\u51fa\u73b0\u4e00\u4e2a\u661f\u53f7\uff08*\uff09\u6216\u80050.0.0.0\uff1b\u7b2c\u4e09\u5217\u5c55\u793a\u8def\u7531\u7684\u6982\u8ff0\uff0c\u5728\u4e3a\u5177\u4f53\u7684I P\u5730\u5740\u627e\u51fa\u6700\u6070\u5f53\u7684\u8def\u7531\u65f6\uff0c\u5185\u6838\u5c06\u67e5\u770b\u8def\u7531\u8868\u5185\u7684\u6240\u6709\u6761\u76ee\uff0c\u5728\u5bf9\u627e\u5230\u7684\u8def\u7531\u4e0e\u76ee\u6807\u8def\u7531\u6bd4\u8f83\u4e4b\u524d\uff0c\u5c06\u5bf9I P\u5730\u5740\u548cgenmask\u8fdb\u884c\u6309\u4f4d\u201c\u4e0e\u201d\u8ba1\u7b97\uff1b\u7b2c\u56db\u5217\u663e\u793a\u4e86\u4e0d\u540c\u7684\u6807\u8bb0\uff0c\u8fd9\u4e9b\u6807\u8bb0\u7684\u8bf4\u660e\u5982\u4e0b\uff1a
\n\u25a0 G \u8def\u7531\u5c06\u91c7\u7528\u7f51\u5173\u3002
\n\u25a0 U \u51c6\u5907\u4f7f\u7528\u7684\u63a5\u53e3\u5904\u4e8e\u201c\u6d3b\u52a8\u201d\u72b6\u6001\u3002
\n\u25a0 H \u901a\u8fc7\u8be5\u8def\u7531\uff0c\u53ea\u80fd\u62b5\u8fbe\u4e00\u53f0\u4e3b\u673a\u3002
\n\u25a0 D \u5982\u679c\u8def\u7531\u8868\u7684\u6761\u76ee\u662f\u7531ICMP\u91cd\u5b9a\u5411\u6d88\u606f\u751f\u6210\u7684\uff0c\u5c31\u4f1a\u8bbe\u7f6e\u8fd9\u4e2a\u6807\u8bb0\u3002
\n\u25a0 M \u5982\u679c\u8def\u7531\u8868\u6761\u76ee\u5df2\u88abICMP\u91cd\u5b9a\u5411\u6d88\u606f\u4fee\u6539\uff0c\u5c31\u4f1a\u8bbe\u7f6e\u8fd9\u4e2a\u6807\u8bb0\u3002
\nnetstat\u8f93\u51fa\u7ed3\u679c\u7684Iface\u663e\u793a\u8be5\u8fde\u63a5\u6240\u7528\u7684\u7269\u7406\u7f51\u5361\uff0c\u5982eth0\u8868\u793a\u7528\u7b2c\u4e00\u5f20\uff0ceth1\u8868\u793a\u7528\u7b2c\u4e8c\u5f20\u3002
\n\u25c6 \u663e\u793a\u63a5\u53e3\u7279\u6027
\n\u5728\u968f- i\u6807\u8bb0\u4e00\u8d77\u8c03\u7528\u65f6\uff0c netstat\u5c06\u663e\u793a\u7f51\u7edc\u63a5\u53e3\u7684\u5f53\u524d\u914d\u7f6e\u7279\u6027\u3002\u9664\u6b64\u4ee5\u5916\uff0c\u5982\u679c\u8c03\u7528\u65f6\u8fd8\u5e26\u4e0a-a\u9009\u9879\uff0c\u5b83\u8fd8\u5c06\u8f93\u51fa\u5185\u6838\u4e2d\u6240\u6709\u63a5\u53e3\uff0c\u5e76\u4e0d\u53ea\u662f\u5f53\u524d\u914d\u7f6e\u7684\u63a5\u53e3\u3002netstat-i\u7684\u8f93\u51fa\u7ed3\u679c\u662f\u8fd9\u6837\u7684\uff1a
\n[root@machine1 \/]$ netstat -i
\nKernel Interface table
\nIface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
\neth0 1500 0 787165 0 0 1 51655 0 0 0 BRU
\neth1 1500 0 520811 0 0 0 1986 0 0 0 BRU
\nlo 3924 0 1943 0 0 0 43 0 0 0 LRU
\nMTU\u548cMet\u5b57\u6bb5\u8868\u793a\u7684\u662f\u63a5\u53e3\u7684MTU\u548c\u5ea6\u91cf\u503c\u503c\uff1bRX\u548cTX\u8fd9\u4e24\u5217\u8868\u793a\u7684\u662f\u5df2\u7ecf\u51c6\u786e\u65e0\u8bef\u5730\u6536\u53d1\u4e86\u591a\u5c11\u6570\u636e\u5305\uff08 RX – OK \/ TX – OK\uff09\u3001\u4ea7\u751f\u4e86\u591a\u5c11\u9519\u8bef\uff08 RX-ERR\/TX-ERR\uff09\u3001\u4e22\u5f03\u4e86\u591a\u5c11\u5305\uff08RX-DRP\/TX-DRP\uff09\uff0c\u7531\u4e8e\u8bef\u5dee\u800c\u9057\u5931\u4e86\u591a\u5c11\u5305\uff08RX-OVR\/TX-OVR\uff09\uff1b\u6700\u540e\u4e00\u5217\u5c55\u793a\u7684\u662f\u4e3a\u8fd9\u4e2a\u63a5\u53e3\u8bbe\u7f6e\u7684\u6807\u8bb0\uff0c\u5728\u5229\u7528ifconfig\u663e\u793a\u63a5\u53e3\u914d\u7f6e\u65f6\uff0c\u8fd9\u4e9b\u6807\u8bb0\u90fd\u91c7\u7528\u4e00\u4e2a\u5b57\u6bcd\u3002\u5b83\u4eec\u7684\u8bf4\u660e\u5982\u4e0b\uff1a
\n\u25a0 B \u5df2\u7ecf\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u5e7f\u64ad\u5730\u5740\u3002
\n\u25a0 L \u8be5\u63a5\u53e3\u662f\u4e00\u4e2a\u56de\u9001\u8bbe\u5907\u3002
\n\u25a0 M \u63a5\u6536\u6240\u6709\u6570\u636e\u5305\uff08\u6df7\u4e71\u6a21\u5f0f\uff09\u3002
\n\u25a0 N \u907f\u514d\u8ddf\u8e2a\u3002
\n\u25a0 O \u5728\u8be5\u63a5\u53e3\u4e0a\uff0c\u7981\u7528A R P\u3002
\n\u25a0 P \u8fd9\u662f\u4e00\u4e2a\u70b9\u5230\u70b9\u94fe\u63a5\u3002
\n\u25a0 R \u63a5\u53e3\u6b63\u5728\u8fd0\u884c\u3002
\n\u25a0 U \u63a5\u53e3\u5904\u4e8e\u201c\u6d3b\u52a8\u201d\u72b6\u6001\u3002
\n\u25c6 \u663e\u793a\u94fe\u63a5
\nnetstat\u652f\u6301\u7528\u4e8e\u663e\u793a\u6d3b\u52a8\u6216\u88ab\u52a8\u5957\u63a5\u5b57\u7684\u9009\u9879\u96c6\u3002\u9009\u9879- t\u3001- u\u3001- w\u548c- x\u5206\u522b\u8868\u793aTCP\u3001UDP\u3001RAW\u548cUNIX\u5957\u63a5\u5b57\u8fde\u63a5\u3002\u5982\u679c\u4f60\u53e6\u5916\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e2a- a\u6807\u8bb0\uff0c\u8fd8\u4f1a\u663e\u793a\u51fa\u7b49\u5f85\u8fde\u63a5\uff08\u4e5f\u5c31\u662f\u8bf4\u5904\u4e8e\u76d1\u542c\u6a21\u5f0f\uff09\u7684\u5957\u63a5\u5b57\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u5f97\u5230\u4e00\u4efd\u670d\u52a1\u5668\u6e05\u5355\uff0c\u5f53\u524d\u6240\u6709\u8fd0\u884c\u4e8e\u7cfb\u7edf\u4e2d\u7684\u6240\u6709\u670d\u52a1\u5668\u90fd\u4f1a\u5217\u5165\u5176\u4e2d\u3002
\n\u8c03\u7528netstat -ta\u65f6\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\uff1a
\n[root@machine1 \/]$ netstat -ta
\nActive Internet connections (servers and established)
\nProto Recv-Q Send-Q Local Address Foreign Address State
\ntcp 0 2 210.34.6.89:telnet 210.34.6.96:2873 ESTABLISHED
\ntcp 0 0 210.34.6.89:1165 210.34.6.84:netbios-ssn ESTABLISHED
\ntcp 0 0 localhost.localdom:9001 localhost.localdom:1162 ESTABLISHED
\ntcp 0 0 localhost.localdom:1162 localhost.localdom:9001 ESTABLISHED
\ntcp 0 0 *:9001 *:* LISTEN
\ntcp 0 0 *:6000 *:* LISTEN
\ntcp 0 0 *:socks *:* LISTEN
\ntcp 0 80 210.34.6.89:1161 210.34.6.10:netbios-ssn CLOSE
\n\u4e0a\u9762\u7684\u8f93\u51fa\u8868\u660e\u90e8\u5206\u670d\u52a1\u5668\u5904\u4e8e\u7b49\u5f85\u63a5\u5165\u8fde\u63a5\u72b6\u6001\u3002\u5229\u7528- a\u9009\u9879\u7684\u8bdd\uff0cnetstat\u8fd8\u4f1a\u663e\u793a\u51fa\u6240\u6709\u7684\u5957\u63a5\u5b57\u3002\u6ce8\u610f\u6839\u636e\u7aef\u53e3\u53f7\uff0c\u53ef\u4ee5\u5224\u65ad\u51fa\u4e00\u6761\u8fde\u63a5\u662f\u5426\u662f\u5916\u51fa\u8fde\u63a5\u3002\u5bf9\u547c\u53eb\u65b9\u4e3b\u673a\u6765\u8bf4\uff0c\u5217\u51fa\u7684\u7aef\u53e3\u53f7\u5e94\u8be5\u4e00\u76f4\u662f\u4e00\u4e2a\u6574\u6570\uff0c\u800c\u5bf9\u4f17\u6240\u5468\u77e5\u670d\u52a1\uff08well known service\uff09\u7aef\u53e3\u6b63\u5728\u4f7f\u7528\u4e2d\u7684\u88ab\u547c\u53eb\u65b9\u6765\u8bf4\uff0cnetstat\u91c7\u7528\u7684\u5219\u662f\u53d6\u81ea\/etc\/services\u6587\u4ef6\u7684\u8c61\u5f81\u6027\u670d\u52a1\u540d<\/p>\n","protected":false},"excerpt":{"rendered":"
netstat\u547d\u4ee4\u662f\u4e00\u4e2a\u76d1\u63a7TCP\/IP\u7f51\u7edc\u7684\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u663e\u793a\u8def\u7531\u8868\u3001\u5b9e\u9645\u7684\u7f51\u7edc\u8fde\u63a5\u4ee5\u53ca\u6bcf\u4e00\u4e2a\u7f51\u7edc\u63a5 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71],"tags":[133],"_links":{"self":[{"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/posts\/278"}],"collection":[{"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/comments?post=278"}],"version-history":[{"count":1,"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/posts\/278\/revisions"}],"predecessor-version":[{"id":279,"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/posts\/278\/revisions\/279"}],"wp:attachment":[{"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/media?parent=278"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/categories?post=278"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecjtu.com\/keith\/wp-json\/wp\/v2\/tags?post=278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}