I am attempting to setup a NAT router and firewall on my internal network. It's function would be to provide an area of protection between myself and the rest of the network. Also, I have been seriously learning Linux, and this is the next logical step. Here's the problem, I don't have a clue what to do! Every documentation that I find seems to contradict each other. I am using RedHat 7.3 from downloaded ISO images. Upon install I have installed iptables and other routing "stuff".
Upon setting it up (adding the info to my '/etc/sysconfig/network' file, etc.) One book I have states that I am to run modprobe ip_tables. When I do so, all hell breaks loose. Here is my error message.
[root@natrouter root]# modprobe ip_tables /lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: init_module: Device or resource busy Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters /lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: insmod /lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o failed /lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: insmod ip_tables failed [root@natrouter root]#
Now, I'm lost as it is, so this just completely doesn't make sense. This is an install from a RedHat 7.3 cd, so I'm assuming the problem is in something that I am doing. Any help would be appreciated. I'd also be interested in any books / documentation that explains setting up iptables for nat routing on a simple lan in "n00b" terms. When it comes to this aspect of the "Power of Linux" ... I'm lost. But hey, give me credit ... I want to learn. -Jon "GenKiller" Gaudette
