如图,命令提示符里输入netstat,同一个局域网中有一个地址是established是什么意思?端口,黑客,协议? 在 cmd 下输入netstat －an后 显示的数据是什么...
\u6211\u7528netstat -an\u91cc\u9762\u7684dos\u91cc\u9762\u6709LISTENING\u548cESTABLISHED\u8fd8\u6709\u4e00\u4e2aLAST-ACK\u662f\u4ec0\u4e48\u610f\u601dnetstat\u547d\u4ee4\u7684\u529f\u80fd\u662f\u663e\u793a\u7f51\u7edc\u8fde\u63a5\u3001\u8def\u7531\u8868\u548c\u7f51\u7edc\u63a5\u53e3\u4fe1\u606f\uff0c\u53ef\u4ee5\u8ba9\u7528\u6237\u5f97\u77e5\u76ee\u524d\u90fd\u6709\u54ea\u4e9b\u7f51\u7edc\u8fde\u63a5\u6b63\u5728\u8fd0\u4f5c\u3002
\u8be5\u547d\u4ee4\u7684\u4e00\u822c\u683c\u5f0f\u4e3a\uff1a
netstat [\u9009\u9879]
\u547d\u4ee4\u4e2d\u5404\u9009\u9879\u7684\u542b\u4e49\u5982\u4e0b\uff1a
-a \u663e\u793a\u6240\u6709socket\uff0c\u5305\u62ec\u6b63\u5728\u76d1\u542c\u7684\u3002
-c \u6bcf\u96941\u79d2\u5c31\u91cd\u65b0\u663e\u793a\u4e00\u904d\uff0c\u76f4\u5230\u7528\u6237\u4e2d\u65ad\u5b83\u3002
-i \u663e\u793a\u6240\u6709\u7f51\u7edc\u63a5\u53e3\u7684\u4fe1\u606f\uff0c\u683c\u5f0f\u540c\u201cifconfig -e\u201d\u3002
-n \u4ee5\u7f51\u7edcIP\u5730\u5740\u4ee3\u66ff\u540d\u79f0\uff0c\u663e\u793a\u51fa\u7f51\u7edc\u8fde\u63a5\u60c5\u5f62\u3002
-r \u663e\u793a\u6838\u5fc3\u8def\u7531\u8868\uff0c\u683c\u5f0f\u540c\u201croute -e\u201d\u3002
-t \u663e\u793aTCP\u534f\u8bae\u7684\u8fde\u63a5\u60c5\u51b5\u3002
-u \u663e\u793aUDP\u534f\u8bae\u7684\u8fde\u63a5\u60c5\u51b5\u3002
-v \u663e\u793a\u6b63\u5728\u8fdb\u884c\u7684\u5de5\u4f5c\u3002
-A \u663e\u793a\u4efb\u4f55\u5173\u8054\u7684\u534f\u8bae\u63a7\u5236\u5757\u7684\u5730\u5740\u3002\u4e3b\u8981\u7528\u4e8e\u8c03\u8bd5
-a \u663e\u793a\u6240\u6709\u5957\u63a5\u5b57\u7684\u72b6\u6001\u3002\u5728\u4e00\u822c\u60c5\u51b5\u4e0b\u4e0d\u663e\u793a\u4e0e\u670d\u52a1\u5668\u8fdb\u7a0b\u76f8\u5173\u8054\u7684\u5957\u63a5\u5b57
-i \u663e\u793a\u81ea\u52a8\u914d\u7f6e\u63a5\u53e3\u7684\u72b6\u6001\u3002\u90a3\u4e9b\u5728\u7cfb\u7edf\u521d\u59cb\u5f15\u5bfc\u540e\u914d\u7f6e\u7684\u63a5\u53e3\u72b6\u6001\u4e0d\u5728\u8f93\u51fa\u4e4b\u5217
-m \u6253\u5370\u7f51\u7edc\u5b58\u50a8\u5668\u7684\u4f7f\u7528\u60c5\u51b5
-n \u6253\u5370\u5b9e\u9645\u5730\u5740\uff0c\u800c\u4e0d\u662f\u5bf9\u5730\u5740\u7684\u89e3\u91ca\u6216\u8005\u663e\u793a\u4e3b\u673a\uff0c\u7f51\u7edc\u540d\u4e4b\u7c7b\u7684\u7b26\u53f7
-r \u6253\u5370\u8def\u7531\u9009\u62e9\u8868
-f address -family\u5bf9\u4e8e\u7ed9\u51fa\u540d\u5b57\u7684\u5730\u5740\u7c07\u6253\u5370\u7edf\u8ba1\u6570\u5b57\u548c\u63a7\u5236\u5757\u4fe1\u606f\u3002\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u552f\u4e00\u652f\u6301\u7684\u5730\u5740\u7c07\u662finet
-I interface \u53ea\u6253\u5370\u7ed9\u51fa\u540d\u5b57\u7684\u63a5\u53e3\u72b6\u6001
-p protocol-name \u53ea\u6253\u5370\u7ed9\u51fa\u540d\u5b57\u7684\u534f\u8bae\u7684\u7edf\u8ba1\u6570\u5b57\u548c\u534f\u8bae\u63a7\u5236\u5757\u4fe1\u606f
-s \u6253\u5370\u6bcf\u4e2a\u534f\u8bae\u7684\u7edf\u8ba1\u6570\u5b57
-t \u5728\u8f93\u51fa\u663e\u793a\u4e2d\u7528\u65f6\u95f4\u4fe1\u606f\u4ee3\u66ff\u961f\u5217\u957f\u5ea6\u4fe1\u606f\u3002
netstat\u547d\u4ee4\u7684\u5217\u6807\u9898
Name \u63a5\u53e3\u7684\u540d\u5b57
Mtu \u63a5\u53e3\u7684\u6700\u5927\u4f20\u8f93\u5355\u4f4d
Net/Dest \u63a5\u53e3\u6240\u5728\u7684\u7f51\u7edc
Address \u63a5\u53e3\u7684IP\u5730\u5740
Ipkts \u63a5\u6536\u5230\u7684\u6570\u636e\u5305\u6570\u76ee
Ierrs \u63a5\u6536\u5230\u65f6\u5df2\u635f\u574f\u7684\u6570\u636e\u5305\u6570\u76ee
Opkts \u53d1\u9001\u7684\u6570\u636e\u5305\u6570\u76ee
Oeers \u53d1\u9001\u65f6\u5df2\u635f\u574f\u7684\u6570\u636e\u5305\u6570\u76ee
Collisions \u7531\u8fd9\u4e2a\u63a5\u53e3\u6240\u8bb0\u5f55\u7684\u7f51\u7edc\u51b2\u7a81\u6570\u76ee
netstat\u7684\u4e00\u4e9b\u5e38\u7528\u9009\u9879\uff1a
netstat -s--\u672c\u9009\u9879\u80fd\u591f\u6309\u7167\u5404\u4e2a\u534f\u8bae\u5206\u522b\u663e\u793a\u5176\u7edf\u8ba1\u6570\u636e\u3002\u5982\u679c\u4f60\u7684\u5e94\u7528\u7a0b\u5e8f\uff08\u5982Web\u6d4f\u89c8\u5668\uff09\u8fd0\u884c\u901f\u5ea6\u6bd4\u8f83\u6162\uff0c\u6216\u8005\u4e0d\u80fd\u663e\u793aWeb\u9875\u4e4b\u7c7b\u7684\u6570\u636e\uff0c\u90a3\u4e48\u4f60\u5c31\u53ef\u4ee5\u7528\u672c\u9009\u9879\u6765\u67e5\u770b\u4e00\u4e0b\u6240\u663e\u793a\u7684\u4fe1\u606f\u3002\u4f60\u9700\u8981\u4ed4\u7ec6\u67e5\u770b\u7edf\u8ba1\u6570\u636e\u7684\u5404\u884c\uff0c\u627e\u5230\u51fa\u9519\u7684\u5173\u952e\u5b57\uff0c\u8fdb\u800c\u786e\u5b9a\u95ee\u9898\u6240\u5728\u3002
netstat -e--\u672c\u9009\u9879\u7528\u4e8e\u663e\u793a\u5173\u4e8e\u4ee5\u592a\u7f51\u7684\u7edf\u8ba1\u6570\u636e\u3002\u5b83\u5217\u51fa\u7684\u9879\u76ee\u5305\u62ec\u4f20\u9001\u7684\u6570\u636e\u62a5\u7684\u603b\u5b57\u8282\u6570\u3001\u9519\u8bef\u6570\u3001\u5220\u9664\u6570\u3001\u6570\u636e\u62a5\u7684\u6570\u91cf\u548c\u5e7f\u64ad\u7684\u6570\u91cf\u3002\u8fd9\u4e9b\u7edf\u8ba1\u6570\u636e\u65e2\u6709\u53d1\u9001\u7684\u6570\u636e\u62a5\u6570\u91cf\uff0c\u4e5f\u6709\u63a5\u6536\u7684\u6570\u636e\u62a5\u6570\u91cf\u3002\u8fd9\u4e2a\u9009\u9879\u53ef\u4ee5\u7528\u6765\u7edf\u8ba1\u4e00\u4e9b\u57fa\u672c\u7684\u7f51\u7edc\u6d41\u91cf\uff09\u3002
netstat -r--\u672c\u9009\u9879\u53ef\u4ee5\u663e\u793a\u5173\u4e8e\u8def\u7531\u8868\u7684\u4fe1\u606f\uff0c\u7c7b\u4f3c\u4e8e\u540e\u9762\u6240\u8bb2\u4f7f\u7528route print\u547d\u4ee4\u65f6\u770b\u5230\u7684 \u4fe1\u606f\u3002\u9664\u4e86\u663e\u793a\u6709\u6548\u8def\u7531\u5916\uff0c\u8fd8\u663e\u793a\u5f53\u524d\u6709\u6548\u7684\u8fde\u63a5\u3002
netstat -a--\u672c\u9009\u9879\u663e\u793a\u4e00\u4e2a\u6240\u6709\u7684\u6709\u6548\u8fde\u63a5\u4fe1\u606f\u5217\u8868\uff0c\u5305\u62ec\u5df2\u5efa\u7acb\u7684\u8fde\u63a5\uff08ESTABLISHED\uff09\uff0c\u4e5f\u5305\u62ec\u76d1\u542c\u8fde\u63a5\u8bf7\u6c42\uff08LISTENING\uff09\u7684\u90a3\u4e9b\u8fde\u63a5\u3002
bnetstat -n--\u663e\u793a\u6240\u6709\u5df2\u5efa\u7acb\u7684\u6709\u6548\u8fde\u63a5\u3002
�0�0 AWKPHP\u7ecf\u5178 �0�3netstat -an\u4e2dstate\u542b\u4e49
netstat -an\u4e2dstate\u542b\u4e49
LISTEN\uff1a\u4fa6\u542c\u6765\u81ea\u8fdc\u65b9\u7684TCP\u7aef\u53e3\u7684\u8fde\u63a5\u8bf7\u6c42
SYN-SENT\uff1a\u518d\u53d1\u9001\u8fde\u63a5\u8bf7\u6c42\u540e\u7b49\u5f85\u5339\u914d\u7684\u8fde\u63a5\u8bf7\u6c42
SYN-RECEIVED\uff1a\u518d\u6536\u5230\u548c\u53d1\u9001\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\u540e\u7b49\u5f85\u5bf9\u65b9\u5bf9\u8fde\u63a5\u8bf7\u6c42\u7684\u786e\u8ba4
ESTABLISHED\uff1a\u4ee3\u8868\u4e00\u4e2a\u6253\u5f00\u7684\u8fde\u63a5
FIN-WAIT-1\uff1a\u7b49\u5f85\u8fdc\u7a0bTCP\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\uff0c\u6216\u5148\u524d\u7684\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\u7684\u786e\u8ba4
FIN-WAIT-2\uff1a\u4ece\u8fdc\u7a0bTCP\u7b49\u5f85\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42
CLOSE-WAIT\uff1a\u7b49\u5f85\u4ece\u672c\u5730\u7528\u6237\u53d1\u6765\u7684\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42
CLOSING\uff1a\u7b49\u5f85\u8fdc\u7a0bTCP\u5bf9\u8fde\u63a5\u4e2d\u65ad\u7684\u786e\u8ba4
LAST-ACK\uff1a\u7b49\u5f85\u539f\u6765\u7684\u53d1\u5411\u8fdc\u7a0bTCP\u7684\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\u7684\u786e\u8ba4
TIME-WAIT\uff1a\u7b49\u5f85\u8db3\u591f\u7684\u65f6\u95f4\u4ee5\u786e\u4fdd\u8fdc\u7a0bTCP\u63a5\u6536\u5230\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\u7684\u786e\u8ba4
CLOSED\uff1a\u6ca1\u6709\u4efb\u4f55\u8fde\u63a5\u72b6\u6001
NETSTAT\u547d\u4ee4\u8be6\u89e3
\u6d1b\u90fd\u7f51iamafan
netstat
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
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 2 210.34.6.89:telnet 210.34.6.96:2873 ESTABLISHED
tcp 296 0 210.34.6.89:1165 210.34.6.84:netbios-ssn ESTABLISHED
tcp 0 0 localhost.localdom:9001 localhost.localdom:1162 ESTABLISHED
tcp 0 0 localhost.localdom:1162 localhost.localdom:9001 ESTABLISHED
tcp 0 80 210.34.6.89:1161 210.34.6.10:netbios-ssn CLOSE
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags Type State I-Node Path
unix 1 [ ] STREAM CONNECTED 16178 @000000dd
unix 1 [ ] STREAM CONNECTED 16176 @000000dc
unix 9 [ ] DGRAM 5292 /dev/log
unix 1 [ ] STREAM CONNECTED 16182 @000000df
\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
\u4e8b\u5b9e\u4e0a\uff0cnetstat\u662f\u82e5\u5e72\u4e2a\u5de5\u5177\u7684\u6c47\u603b\u3002
\u25c6 \u663e\u793a\u8def\u7531\u8868
\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
[root@machine1 /]$ netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
210.34.6.0 0.0.0.0 255.255.255.128 U 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 210.34.6.2 0.0.0.0 UG 0 0 0 eth0
- 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
netstat\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
\u25a0 G \u8def\u7531\u5c06\u91c7\u7528\u7f51\u5173\u3002
\u25a0 U \u51c6\u5907\u4f7f\u7528\u7684\u63a5\u53e3\u5904\u4e8e\u201c\u6d3b\u52a8\u201d\u72b6\u6001\u3002
\u25a0 H \u901a\u8fc7\u8be5\u8def\u7531\uff0c\u53ea\u80fd\u62b5\u8fbe\u4e00\u53f0\u4e3b\u673a\u3002
\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
\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
netstat\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
\u25c6 \u663e\u793a\u63a5\u53e3\u7279\u6027
\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
[root@machine1 /]$ netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0 787165 0 0 1 51655 0 0 0 BRU
eth1 1500 0 520811 0 0 0 1986 0 0 0 BRU
lo 3924 0 1943 0 0 0 43 0 0 0 LRU
MTU\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
\u25a0 B \u5df2\u7ecf\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u5e7f\u64ad\u5730\u5740\u3002
\u25a0 L \u8be5\u63a5\u53e3\u662f\u4e00\u4e2a\u56de\u9001\u8bbe\u5907\u3002
\u25a0 M \u63a5\u6536\u6240\u6709\u6570\u636e\u5305\uff08\u6df7\u4e71\u6a21\u5f0f\uff09\u3002
\u25a0 N \u907f\u514d\u8ddf\u8e2a\u3002
\u25a0 O \u5728\u8be5\u63a5\u53e3\u4e0a\uff0c\u7981\u7528A R P\u3002
\u25a0 P \u8fd9\u662f\u4e00\u4e2a\u70b9\u5230\u70b9\u94fe\u63a5\u3002
\u25a0 R \u63a5\u53e3\u6b63\u5728\u8fd0\u884c\u3002
\u25a0 U \u63a5\u53e3\u5904\u4e8e\u201c\u6d3b\u52a8\u201d\u72b6\u6001\u3002
\u25c6 \u663e\u793a\u94fe\u63a5
netstat\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
\u8c03\u7528netstat -ta\u65f6\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\uff1a
[root@machine1 /]$ netstat -ta
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 2 210.34.6.89:telnet 210.34.6.96:2873 ESTABLISHED
tcp 0 0 210.34.6.89:1165 210.34.6.84:netbios-ssn ESTABLISHED
tcp 0 0 localhost.localdom:9001 localhost.localdom:1162 ESTABLISHED
tcp 0 0 localhost.localdom:1162 localhost.localdom:9001 ESTABLISHED
tcp 0 0 *:9001 *:* LISTEN
tcp 0 0 *:6000 *:* LISTEN
tcp 0 0 *:socks *:* LISTEN
tcp 0 80 210.34.6.89:1161 210.34.6.10:netbios-ssn CLOSE
\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\u3002
ESTABLISHED的意思是建立连接，表示两台机器正在通信，即本机的FTP服务正在被192.168.1.107这台计算机访问。
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