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Old 07-08-2002, 10:44 PM   #1
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Registered: Jul 2002
Location: Toronto
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Linux Firewall Design Tool......Help!!!


I am trying to install a Firewall on my Redhat 7.3 server using this “Linux Firewall Design Tool” by Robert L. Ziegler on his website:
I am using DHCPCD to dynamically obtain an IP address from my ISP.
I followed all the steps until I reached
6.Create the /etc/dhcpc/dhcpcd-eth0.exe script. Insert any additional functionality from the example dhcpcd-eth0.exe as needed.
7.Execute the script from the command line the first time.

I am lost here! How do you create this “/etc/dhcpc/dhcpcd-eth0.exe” script
And what script does he meant by “Execute the script from the command line” I tried executing this “/etc/dhcpc/dhcpcd-eth0.exe” it came back with an error message “bad intrepeter: No such file or directory”
I tried running the script “rc.firewall” I got the exact previous message!!!!
What is going wrong here????
Again, I am sure that the Script file “rc.firewall” is correct, but how do you run it to make it active???

Thanx in Advance for anybody that will spare a moment to help

Old 07-08-2002, 11:10 PM   #2
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Registered: Jun 2001
Location: South Alabama
Distribution: Fedora / RedHat / SuSE
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I don't use that tool so I'm not going to try and explain that, but maybe this will help.

to be able to run something you need to supply the path/filename

for instance:

if you are in the directory that the file is in you can express the path several ways
the easiest is ./
so ./filename will point to filename in the current dir
also you could type /full/path/to/filename
or $PWD/filename
$pwd is a variable for the current dir

the other problem is that when you do point to the file you must have permission to exec it.

ls -l /path/filename

[root@Micro root]# ls -l /etc/rc.d/rc.firewall
-rw-r--r-- 1 root root 123 Jun 20 19:24 /etc/rc.d/rc.firewall

you have no permission to exec this file even as root

[root@Micro root]# chmod 755 /etc/rc.d/rc.firewall

[root@Micro root]# ls -l /etc/rc.d/rc.firewall
-rwxr-xr-x 1 root root 123 Jun 20 19:24 /etc/rc.d/rc.firewall

now anybody can exec this script (of course this is not a good idea, you should only allow root to run it

[root@Micro root]# chmod 700 /etc/rc.d/rc.firewall

[root@Micro root]# ls -l /etc/rc.d/rc.firewall
-rwx------ 1 root root 123 Jun 20 19:24 /etc/rc.d/rc.firewall

now only root can access and exec the file
here's how it works

there are three sets of permissions, one for owner, one for group, and one for everybody

so 700 is -421------ or -rwx------

read, write, execute


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