kfirewall 0.4.0

1. Introduction

Welcome to kfirewall. This application uses ipchains rules. kfirewall gives you the option to close a port for the rest of your network or the internet. There is a list of the most commonly exploited ports later. There is probably some qt and KDE guru out there who thinks this application sucks, or that the code is poorly. I have to say that I am not a very good coder, the kfirewall code may be poor, or/and bad but it works (here anyway). So if you like it, use it, if not send me a mail with things to change.

kfirewall starts with probing you loopback interface, witch is no good. If you would add some rules to your LAN, use eth0, slip0 or plip0 (eth0 is ethernet, slip0 is serial line, plip0 is pararell line), if you should protect your computer against the internet use ppp0, ippp0 (ppp0 for modem, and ippp0 for ISDN).

I would like to say that I am sorry about all the mess with the vesion number. But I have thought it over, and I think i will begin with three digits instead of two :)

2. Usage

2.1 Configuration

The configuration has been updated, all you have to do to is insert your ethernet IP-address and your netmask. You can find these options at the bottom left of the application.

2.2 Ports

3. The Menu

3.1 Add/delete rules

Add rule will block the port you have specified in the port input. Delete rule will open the port you have specified unless the port is not blocked. You can't open a port witch isen't blocked :-)

3.2 Delete all rules

This is used to flush all the rules, to get a clean and fresh start.

3.3 Masqurading on

Masqurading on means allow all connections from your network to access the internet.

3.4 List rules

This is a brand new option, witch will allow you to view all the current rules in ipchains/ipfwadm.

3.5 Probe interface

This is a autoprobe for you eth0 device, and only the eth0 device. It will find your IP address and your netmask. If it dosen't get you IP address, then configure it manualy.

3.6 Clear list

This clears the rule list.

4. FAQ

4.1 Troubleshooting

If you get an error message like: "ipfchains/ipfwadm died" then there are several things to check. First, are you running kfirewall as root? If not, then you have to "su" to root (since you must be root to handle ipchains and ipfwadm rules). Second, are ipchains or ipfwadm in your $PATH? If not use "export PATH="$PATH:/usr/sbin:/sbin"" to export a new path. If you do not know where ipchains or ipfwadm is located use the whereis or locate command "whereis ipchains".

4.2 Can kfirewall handle more than one NIC?

No, not yet, but I plan to add that functionality in a later version.

5. Thanks to