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Old 07-08-2002, 10:44 PM   #1
rami9009
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Registered: Jul 2002
Location: Toronto
Posts: 1

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Linux Firewall Design Tool......Help!!!


Gents

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: http://www.linux-firewall-tools.com/...all/index.html
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

Rami
 
Old 07-08-2002, 11:10 PM   #2
DavidPhillips
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Registered: Jun 2001
Location: South Alabama
Distribution: Fedora / RedHat / SuSE
Posts: 7,163

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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

-421421421
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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