Linux系统安全----端口扫描

Posted 2021-06-11 还行少年

端口扫描

NMAP是一个强大的端口扫描类安全评测工具

1.安装NMAP软件包

2.扫描语法及类型

nmap  【扫描类型】 【选项】 <扫描目标>

扫描目标可以是主机名，ip地址或者网络地址
常用扫描类型
-sS，TCP SYN扫描（半开扫描）
-sT，TCP连接扫描
-sF，TCP FIN扫描
-sU，UDP扫描
-sP，ICMP扫描
-P0，跳过ping检测
-p，指定扫描的端口

3.扫描操作

扫描TCP端口

[root@localhost ~]# nmap 127.0.0.1   //扫描TCP端口

Starting Nmap 6.40 ( http://nmap.org ) at 2021-05-17 14:49 CST
Nmap scan report for www.wangdi.com (127.0.0.1)
Host is up (0.000011s latency).
Not shown: 995 closed ports
PORT    STATE SERVICE
22/tcp  open  ssh
23/tcp  open  telnet
80/tcp  open  http
111/tcp open  rpcbind
631/tcp open  ipp

Nmap done: 1 IP address (1 host up) scanned in 1.61 seconds
[root@localhost ~]# 

扫描UDP端口

[root@localhost ~]# nmap -sU 127.0.0.1   //扫描UDP端口

Starting Nmap 6.40 ( http://nmap.org ) at 2021-05-17 14:50 CST
Nmap scan report for www.wangdi.com (127.0.0.1)
Host is up (0.0000040s latency).
Not shown: 998 closed ports
PORT     STATE         SERVICE
111/udp  open          rpcbind
5353/udp open|filtered zeroconf

Nmap done: 1 IP address (1 host up) scanned in 2.71 seconds
[root@localhost ~]# 

检测网段内有哪些主机存活

[root@localhost ~]# nmap -n -sP 192.168.177.0/24

Starting Nmap 6.40 ( http://nmap.org ) at 2021-05-17 15:32 CST
Nmap scan report for 192.168.177.1
Host is up (0.00022s latency).
MAC Address: 00:50:56:C0:00:08 (VMware)
Nmap scan report for 192.168.177.2
Host is up (0.00011s latency).
MAC Address: 00:50:56:E6:24:07 (VMware)
Nmap scan report for 192.168.177.3
Host is up.
Nmap done: 256 IP addresses (3 hosts up) scanned in 2.04 seconds
[root@localhost ~]#