iptables 방화벽 설정 (포트 오픈)

현재 설정 점검

[root@test11 mail]# iptables -L

Chain RH-Firewall-1-INPUT (2 references)

target     prot opt source               destination         

ACCEPT     all  --  anywhere             anywhere            

ACCEPT     icmp --  anywhere             anywhere            icmp any 

ACCEPT     esp  --  anywhere             anywhere            

ACCEPT     ah   --  anywhere             anywhere            

ACCEPT     udp  --  anywhere             224.0.0.251         udp dpt:mdns 

ACCEPT     udp  --  anywhere             anywhere            udp dpt:ipp 

ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ipp 

ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED 

ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh 

ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:http 

ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ftp 

REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited 

설정파일 변경 (예 5080 포트 추가)

[root@test11 mail]# vi /etc/sysconfig/iptables

# Firewall configuration written by system-config-securitylevel

# Manual customization of this file is not recommended.

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

:RH-Firewall-1-INPUT - [0:0]

-A INPUT -j RH-Firewall-1-INPUT

-A FORWARD -j RH-Firewall-1-INPUT

-A RH-Firewall-1-INPUT -i lo -j ACCEPT

-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT

-A RH-Firewall-1-INPUT -p 50 -j ACCEPT

-A RH-Firewall-1-INPUT -p 51 -j ACCEPT

-A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT

-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT

-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT

-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5080 -j ACCEPT     ---> 추가

-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited

COMMIT

방화벽 규칙 적용

[root@test11 mail]# service iptables restart

재 설정된 설정 점검

[root@test11 mail]# iptables -L

Chain RH-Firewall-1-INPUT (2 references)

target     prot opt source               destination         

ACCEPT     all  --  anywhere             anywhere            

ACCEPT     icmp --  anywhere             anywhere            icmp any 

ACCEPT     esp  --  anywhere             anywhere            

ACCEPT     ah   --  anywhere             anywhere            

ACCEPT     udp  --  anywhere             224.0.0.251         udp dpt:mdns 

ACCEPT     udp  --  anywhere             anywhere            udp dpt:ipp 

ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ipp 

ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED 

ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh 

ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:http 

ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ftp 

ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:5080 

REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited