Linux Firewall

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Linux Firewall

Postby dillona_aix » Sun Oct 16, 2005 1:35 am

I am setting up a Linux Server on my home intranet. I need a firewall solution that will protect my other PCs FROM the server. It seens not to be a common setup. Does anybody have any suggestions?
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Postby dillona_aix » Sun Oct 16, 2005 2:56 am

After searching google I realized i could use iptables to do this. I used this command:
iptables -A OUTPUT -d 192.168.1.0/24 -p all -j REJECT
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Postby zoli » Sun Oct 16, 2005 9:34 am

yes... you are on the right track.
Unfortunately, iptables is a whole science for itself.
You may start reading at:
http://www.faqs.org/docs/iptables/
http://home.frognet.net/~aalug/docs/ipt ... ables.html
http://linux-net.osdl.org/index.php/Iproute2

From other side, there are some out-of-the-box firewall scripts for simple sites.
To be honest, they look too complicate to read and I was not sure that they work here, therefore I have build polarhome's own tables.

In short: if you want to have a fast solution without knowledge - use scripts.
Otherwise start reading (and be prepared that it requires a whole deal of abstarction and understanding before you succseed)
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Z
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Postby DenisF » Sun Oct 16, 2005 8:13 pm

Why not just put your server in your router's DMZ and change the subnet?
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Postby dillona_aix » Mon Oct 17, 2005 4:29 am

Because I need it to be able to access my Internal DNS Server and I need to be able to SSH to it.
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Postby dillona_aix » Thu Oct 27, 2005 2:57 am

Hi,
I have put it in the DMZ. What do I change the Subnet to? The router is 192.168.1.1 ,which I need to access for DNS, outside communication, etc., and the server is 192.168.1.112. The first 11 addresses are already used.
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Postby dillona_aix » Mon Oct 31, 2005 4:51 am

Hi,
I got my firewall to work using iptables.

Note to SuSE users:
In this type of setup I do not recommend using SuSEfirewall2. I would chkconfig the firewall deamons off and create a file named /etc/init.d/after.local containing your iptables scripts. This is set to automaticly run after your system boots in SuSE by default.
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shorewall firewall- another iptables based solution

Postby anuj_irix » Fri Nov 04, 2005 5:42 am

I would like to add few comments about shorewall. I tried the same thing and found shorewall quiet good/flexible/powerful (a bit complicated).
Shorewall -iptables based firewall
You can use the provided sample files for configuring it, otherwise it can take some time.
Download sample files
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