how to config 80 port for apache in iptables

[Sharpe, Sam J]

2009/4/12 Nathan Huang <nathan.vorbei.tech at gmail.com>:
> Hi guys
> who can help me with opening 80 port for apache in iptables, I want to
> access my apache server from remote computer,  but I failed in config
> iptables with 80 port.
>
> First step:
> echo '-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport
> 80 -j ACCEPT' >> /etc/sysconfig/iptables

That's your mistake.

A default /etc/sysconfig/iptables file looks like this:

# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 631 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

Yours probably now looks like this:

# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 631 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

So, my answer would be to take out the last line that you've just added and put:

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

!!ABOVE!! the two lines containing the word REJECT. i.e:

<snip>
-A INPUT -m state --state NEW -m udp -p udp --dport 631 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
<snip>


Then restart IPTables...


-- 
Sam