Linux下防火牆開啟相關埠及檢視已開啟埠
Linux下防火牆開啟相關埠及檢視已開啟埠
1. 預設情況下Linux的防火牆都是在關閉狀態下的
[root@test etc]# service iptables status
Firewall is stopped.
[root@test etc]#
2. 防火牆開通的情況
[root@test ~]# service iptables start
iptables: Applying firewall rules: [ OK ]
[root@test ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
[root@test ~]#
以上可以看出,防火牆開通的埠為22 state NEW tcp dpt:22
還有其他一些狀態資訊
3. 開通特定埠,比如tcp 80 和 5666埠
[root@test ~]# iptables -I INPUT -p tcp --dport 80 -j ACCEPT
4. 儲存並重啟防火牆
[root@test ~]# service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables: [ OK ]
[root@test ~]# service iptables restart
iptables: Flushing firewall rules: [ OK ]
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]
[root@test ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
5 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
6 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
埠80 已開通。同樣的方式開通5666埠
1. 預設情況下Linux的防火牆都是在關閉狀態下的
[root@test etc]# service iptables status
Firewall is stopped.
[root@test etc]#
2. 防火牆開通的情況
[root@test ~]# service iptables start
iptables: Applying firewall rules: [ OK ]
[root@test ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
[root@test ~]#
以上可以看出,防火牆開通的埠為22 state NEW tcp dpt:22
還有其他一些狀態資訊
3. 開通特定埠,比如tcp 80 和 5666埠
[root@test ~]# iptables -I INPUT -p tcp --dport 80 -j ACCEPT
4. 儲存並重啟防火牆
[root@test ~]# service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables: [ OK ]
[root@test ~]# service iptables restart
iptables: Flushing firewall rules: [ OK ]
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]
[root@test ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
5 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
6 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
埠80 已開通。同樣的方式開通5666埠
來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/29500582/viewspace-1337181/,如需轉載,請註明出處,否則將追究法律責任。
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