我尝试打开5431端口,键入:
sudo iptables -A INPUT -p tcp --dport 5431 --jump ACCEPT
iptables-save
当我在链中打印规则时
iptables -S
则输出为:
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
-A INPUT -p tcp -m tcp --dport 5431 -j ACCEPT
因此,我尝试通过nmap从我的机器上检查开放端口:
mwalko@mwalko-X58A-UD3R:~$ nmap 10.1.2.30
Starting Nmap 7.01 ( https://nmap.org ) at 2018-04-20 16:46 CEST
Nmap scan report for static-30.vlan2.vlex.local (10.1.2.30)
Host is up (0.00027s latency).
Not shown: 997 closed ports
PORT STATE SERVICE
22/tcp open ssh
111/tcp open rpcbind
5432/tcp open postgresql
Nmap done: 1 IP address (1 host up) scanned in 0.05 seconds
从上面可以看出,5431仍未开放。如何打开此端口?
@编辑
root@dell1950:/sbin# netstat -ntulp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 923/sshd
tcp 0 0 0.0.0.0:5432 0.0.0.0:* LISTEN 927/postgres
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 861/rpcbind
tcp6 0 0 :::22 :::* LISTEN 923/sshd
tcp6 0 0 :::5432 :::* LISTEN 927/postgres
tcp6 0 0 :::111 :::* LISTEN 861/rpcbind
udp 0 0 0.0.0.0:111 0.0.0.0:* 861/rpcbind
udp 0 0 0.0.0.0:613 0.0.0.0:* 861/rpcbind
udp6 0 0 :::111 :::* 861/rpcbind
udp6 0 0 :::613 :::* 861/rpcbind