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05.16.2008 at 07:10PM PDT, ID: 23410122
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7.8

How do I modify iptables to allow the use of port 25?

Asked by HappyEngineer in IP Tables/IP Chains, Email Servers

How can I modify the following iptables file so that I can get to port 25 from outside? I've found that if I do "telnet localhost 25" then it connects. But if I do "telnet mydomain.com 25" then it tries and eventually times out.

Notice the two lines regarding port 25. I added those and restarted the iptables service, but they don't seem to have done anything.
-A INPUT -p tcp -m tcp --dport 25 --syn -j ACCEPT
-A INPUT -p udp -m udp --dport 25 -j ACCEPT



# 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
#MAIL (SMTP)
-A INPUT -p tcp -m tcp --dport 25 --syn -j ACCEPT
-A INPUT -p udp -m udp --dport 25 -j ACCEPT
#SSH
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
#HTTP
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
#catchall
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
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[+][-]05.16.2008 at 10:25PM PDT, ID: 21588087

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[+][-]05.17.2008 at 04:04AM PDT, ID: 21588723

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[+][-]05.17.2008 at 07:44AM PDT, ID: 21589516

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[+][-]05.17.2008 at 03:37PM PDT, ID: 21590964

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[+][-]05.18.2008 at 09:06AM PDT, ID: 21593139

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About this solution

Zones: IP Tables/IP Chains, Email Servers
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Solution Provided By: Roadrunnernetworking
Participating Experts: 2
Solution Grade: A
 
 
 
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