??????2???л????????
#cd nmap-5.00

??????3?????configure????????make???
#./configure

??????4???????????
#make

??????5???????????
#make install

????3??????????nmap?????????翪????

??????1???????????????????????

???????nmap????????????????????????????????????????????“-sP”????????ping??衣??????￡?nmap???????赽?????????????ICMP echo?????TCP ACK?????????κ????????????nmap?????????????????????????????????????????硣??????????????????
[root@localhost ~]# nmap -sP 10.1.4.0/24
Nmap finished: 256 IP addresses (125 hosts up) scanned in 7.852 seconds

???????????裬???????ù??????????125?????????????????л????????????????и????????裬???????Щ??????????Щ????????

??????2??????????????????????

???????????￡???nmap?????????????????????е??????????????????????????????ж????裬?????????-sT???????????????????
[root@localhost ~]# nmap -v -sT 10.1.4.0/24
Host 10.1.4.11 appears to be up ... good.
Interesting ports on 10.1.4.11:
Not shown: 1673 closed ports
PORT STATE SERVICE
80/tcp open http
MAC Address: 00:1E:65:F0:78:CA (Unknown)

??????????????????????????????????????????????TCP????????????????裬?????????????????125??????????????????2???????TCP???????????????10.1.4.1??10.1.4.11???????????10.1.4.1???????????????????????????????IP???????????????????????п??????????????????IP????趨?X.X.X.1????????????????????????????к???????衣