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3.3.3. Configuring the iptables Firewall to Allow Cluster Components

Listed below are example iptable rules for enabling IP ports needed by Red Hat Enterprise Linux 6 (with High Availability Add-on). Please note that these examples use 192.168.1.0/24 as a subnet, but you will need to replace 192.168.1.0/24 with the appropriate subnet if you use these rules.
For cman (Cluster Manager), use the following filtering. 
$ iptables -I INPUT -m state --state NEW -m multiport -p udp -s 192.168.1.0/24 -d 192.168.1.0/24 --dports 5404,5405 -j ACCEPT
$ iptables -I INPUT -m addrtype --dst-type MULTICAST -m state --state NEW -m multiport -p udp -s 192.168.1.0/24 --dports 5404,5405 -j ACCEPT
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For dlm (Distributed Lock Manager): 
$ iptables -I INPUT -m state --state NEW -p tcp -s 192.168.1.0/24 -d 192.168.1.0/24 --dport 21064 -j ACCEPT
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For ricci (part of Conga remote agent): 
$ iptables -I INPUT -m state --state NEW -p tcp -s 192.168.1.0/24 -d 192.168.1.0/24 --dport 11111 -j ACCEPT
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For modclusterd (part of Conga remote agent): 
$ iptables -I INPUT -m state --state NEW -p tcp -s 192.168.1.0/24 -d 192.168.1.0/24 --dport 16851 -j ACCEPT
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For luci (Conga User Interface server): 
$ iptables -I INPUT -m state --state NEW -p tcp -s 192.168.1.0/24 -d 192.168.1.0/24 --dport 8084 -j ACCEPT
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For igmp (Internet Group Management Protocol): 
$ iptables -I INPUT -p igmp -j ACCEPT
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After executing these commands, enter the following command to save the current configuration for the changes to be persistent during reboot. 
$ service iptables save ; service iptables restart
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