nmap-O不能识别CentOS7操作系统的解决办法？

Question

[root@service tmp]# nmap -O 192.168.1.119

Starting Nmap 6.40 ( http://nmap.org ) at 2019-01-29 22:08 CST
Nmap scan report for 192.168.1.119 (192.168.1.119)
Host is up (0.00039s latency).
Not shown: 997 closed ports
PORT STATE SERVICE
22/tcp open ssh
8009/tcp open ajp13
8080/tcp open http-proxy
MAC Address: 00:0C:29:FD:BE:53 (VMware)
No exact OS matches for host (If you know what OS is running on it, see http://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=6.40%E=4%D=1/29%OT=22%CT=1%CU=32154%PV=Y%DS=1%DC=D%G=Y%M=000C29%T
OS:M=5C505E62%P=x86_64-redhat-linux-gnu)SEQ(SP=107%GCD=1%ISR=10B%TI=Z%II=I%
OS:TS=A)SEQ(SP=107%GCD=1%ISR=10B%TI=Z%TS=A)SEQ(SP=107%GCD=1%ISR=10B%TI=Z%CI
OS:=I%TS=A)OPS(O1=M5B4ST11NW7%O2=M5B4ST11NW7%O3=M5B4NNT11NW7%O4=M5B4ST11NW7
OS:%O5=M5B4ST11NW7%O6=M5B4ST11)WIN(W1=7120%W2=7120%W3=7120%W4=7120%W5=7120%
OS:W6=7120)ECN(R=Y%DF=Y%T=40%W=7210%O=M5B4NNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S
OS:=O%A=S+%F=AS%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%R
OS:D=0%Q=)T5(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=
OS:0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U
OS:1(R=Y%DF=N%T=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%DF
OS:I=N%T=40%CD=S)

Network Distance: 1 hop

OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 12.89 seconds
[root@service tmp]#

Answer 1

官网检测一下，是因为nmap6.40版本对于CentOS7不支持，下载新版本的nmap解决了这一问题：
This fingerprint is from a version of Nmap that is over 3 years old. The latest version may already match this fingerprint, but you can submit anyway.

[root@service bin]# ./nmap -O 192.168.1.119

Starting Nmap 7.31 ( https://nmap.org ) at 2019-01-29 23:25 CST
Nmap scan report for 192.168.1.119 (192.168.1.119)
Host is up (0.00030s latency).
Not shown: 997 closed ports
PORT STATE SERVICE
22/tcp open ssh
8009/tcp open ajp13
8080/tcp open http-proxy
MAC Address: 00:0C:29:FD:BE:53 (VMware)
Device type: general purpose
Running: Linux 3.X|4.X
OS CPE: cpe:/o:linux:linux_kernel:3 cpe:/o:linux:linux_kernel:4
OS details: Linux 3.2 - 4.4
Network Distance: 1 hop

OS detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 2.57 seconds
[root@service bin]#