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09.14.2006 at 02:42AM PDT, ID: 21989155
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7.8

Making permanent changes to iptables firewall rules on Red Hat ES4

Asked by feptias in Linux Network Security

Tags: , , ,

I have a server using Red Hat Linux ES4 with 2 ethernet ports - eth0 is on the LAN and eth1 is connected to the Internet. I have been using the standard Red Hat Security Level Configuration GUI to set up the firewall - e.g. eth0 is trusted device - but now I need to add some more complex rules to allow SIP traffic through the firewall on eth1 from a specific IP address.

I am something of a newbie to Linux, but worked out that the underlying firewall is iptables and found out how to insert new rules in the INPUT chain to allow my SIP traffic through on eth1, for example, "iptables -I INPUT -s <ip_address> -p udp --dport 5060 -i eth1 .....etc". This works fine until the server is rebooted. When it reboots, all the firewall rules are wiped clean and re-created. My added rules disappear.

My question is - what is the best way to add special rules to the firewall and make them permanent so they are retained after a reboot on a Red Hat Linux server?Start Free Trial
[+][-]09.14.2006 at 02:53AM PDT, ID: 17519021

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Zone: Linux Network Security
Tags: iptables, permanent, firewall, rules
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Solution Provided By: ravenpl
Participating Experts: 1
Solution Grade: A
 
 
[+][-]09.14.2006 at 03:38AM PDT, ID: 17519190

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[+][-]09.14.2006 at 03:53AM PDT, ID: 17519257

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[+][-]09.14.2006 at 04:23AM PDT, ID: 17519415

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[+][-]09.14.2006 at 04:26AM PDT, ID: 17519426

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[+][-]09.14.2006 at 04:42AM PDT, ID: 17519502

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[+][-]09.14.2006 at 04:49AM PDT, ID: 17519538

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[+][-]09.14.2006 at 05:57AM PDT, ID: 17520228

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