OK Chris - ya know I think the best thing for you to do right now is read through the IPTables Tutorial http://iptables-tutorial.frozentux.net/. This is a great document that clearly explains the fundamentals, and then some. Go through this and you may be able to solve most of your problems. IF not, re-post your questions based on the new knowledge you have gained from the tutorial. Hang tough - you'll get it working. -----Original Message----- From: Chris Winfield-Blum [mailto:chris@xxxxxxxxxxxxxxxxxx] Sent: Sunday, November 16, 2003 9:47 PM To: markee@xxxxxxxxxxxxxxx; netfilter@xxxxxxxxxxxxxxx Subject: RE: A little help? Hopefully My answers will help Thanks Guys -----Original Message----- From: Mark E. Donaldson [mailto:markee@xxxxxxxxxxxxxxx] Sent: Sunday, November 16, 2003 5:17 AM To: Chris Winfield-Blum; netfilter@xxxxxxxxxxxxxxx Subject: RE: A little help? Chris - couple of questions for you: 1. You have supplied two scripts here. Which one are you trying to use, or which one do you want help with to solve your problem? That will help narrow the focus down. # ANSWER # I am currently using fw.leadside which is working but not allowing everything to be forwarded to the Proxy server as required. fw_leadingside is the script that I started to write to do the proxy server side of it HOWEVER this is not working... so when giving suggestions maybe use this one as the base 2. What specific problems are you having now with your firewall? You mention that Guard Dog is "stuffing up" iptables, but this means very little to me. If you could be more specific as to what is not working that would be helpful. # ANSWER # I stopped using Guarddog and started writing the iptables script to enter all the information in... At the moment I need to: ** create a "group" of $CLIENTS that are machine within the IP range of 192.168.1.11-192.168.1.249 ** have $CLIENTS automatically Forwarded to 3128 for web requests. (but leaving open 25 and 110 to go through normal firwall rules not the proxy) ** I then need everything other port blocked so that Yahoo and MSN etc wont go through another port. 3. What type of connection are your internal clients connected to? Do they have static IP's, or are they being assigned IP's by DHCP? # ANSWER # Machines in the LAN are set IP's via DHCP which is done by another machine on the network. but servers etc are Static IP's 4. You have several Rule chains defined (i.e. firewalled, tcpflags, silent), and yet I don't see any rules for these. What are you trying to do here? # ANSWER # To be honest I dont know! haha I have pulled these things out of other scripts etc... Clear up some of these questions and issues, and someone may be able to help you. Right now, there are too many unknowns and unexplained issues. -----Original Message----- From: netfilter-admin@xxxxxxxxxxxxxxxxxxx [mailto:netfilter-admin@xxxxxxxxxxxxxxxxxxx] On Behalf Of Chris Winfield-Blum Sent: Friday, November 14, 2003 12:46 AM To: netfilter@xxxxxxxxxxxxxxx Subject: A little help? Hi everyone.. i hope that one of you may be able to help... Hi my name is Chris and I'm currently setting up a firewall for my office. However I am pretty much a novice and am having some problems... I read one of your scripts and thought you would be a good person to get in contact with IF i could. I have a firewall up and running BUT my boss is wanting me to block Instant Messaging... I have worked out HOW to do this however the system that I had working was causing problems with the email (i was using Guarddog for KDE) So i have resorted to handwriting everything as I should probably have done before hand. I was hoping that you would be able to help me out... I am limited by what I can do to the network because this is a "stable" network (even though they did not have a firewall before I cam 3 weeks ago) I have installed a Proxy server on the same box as the firewall and the rules successfully prevent clients from accessing yahoo and msn (which a normal firewall wouldnt because they would go through on port 80 etc) BUT when guarddog was used it was stuffing up the IPtables.. (eg i would open Port 80 and it would close it) EXACTLY WHAT I NEED ------------------------------------ I need to have two sections to the firewall.. one being the server and priviledged machine (kind of like DMZ BUT on the same ip range as the clients much to my disgust) Local Clients are from 192.168.1.11-192.168.1.249 (not my setup) I want any machines that are not included in this to NOT have to go through the Firewall if possible. If not all of them I need the mail server (residing on 192.168.1.251) to not be if possible. I would like the following ports FORWARDED to 192.168.1.251 25 80 110 443 that way the squid will do the rules to filter out bad ports etc (right?) I would like all machines that are clients to be Automatically FORWARDED to port 3128 so that the rules can stpo the chatting etc I have given links my "attempt" at this but am really stuck on it.. I realise you have probably got better things to spend your time with but I would be eternally grateful. this would take me HOURS but probably take you minutes. I hope to hear from you soon http://web.igateway.com.au/~chrislive/iptables/fw.leadside http://web.igateway.com.au/~chrislive/iptables/fw_leadingside Thankyou
