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Hello, I need some help setting up my Linux router. Here is the setup. Windows server 2003 > Linux router > Windows 7 client Windows server 2003 with DNS and ...
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- 09-25-2010 #1
- Join Date
- Feb 2009
Windows server -> Linux Router -> Windows client. IPTABLE questions, please help!!!!
I need some help setting up my Linux router. Here is the setup.
Windows server 2003 > Linux router > Windows 7 client
Windows server 2003 with DNS and DHCP enabled and configured
Linux router running fedora core 13 with eth1 pointing to a windows client
and eth0 pointing to windows server.
Windows 7 client PC.
Here is where I need help, I cant seem to configure the firewall rules properly to allow the windows DHCP server to dynamically assign an IP to the client computer.
I tried a various amount of IPTABLES commands to accept INPUT and OUTPUT rules for port 67:68 (udp, tcp)
I have ipforwarding setup on the router. If I statically assign an ip to the client pc I can ping from end to end.
Any assistance is much appreciated!
- 09-27-2010 #2
Per definition you would need the "Linux router" to behave like a switch. A router would always create a subnet, which (physically) is unreachable from the "Windows server 2003" subnet.
So, in reality, you most likely have a network setup like this:
Windows server 2003 (192.168.1.1) + 192.168.1.0/24 + Linux router (192.168.2.1) + 192.168.2.0/24 + Windows 7 client (192.168.2.22)
Windows server 2003 (192.168.1.1) + 192.168.1.0/23 + Linux SWITCH (192.168.2.1) + Windows 7 client (192.168.2.X)
This means that the DHCP information published to clients would be something like:
Thus, a client would send all packets to 192.168.1.1, which then can relay to the linux switch for packets that are destined to 192.168.2.*. Unfortunatly I cannot tell you how to configure the windows server properly cause I simply don't know. You can definitly look up google for answers how to set up an iptables firewall configuration to behave like a switch.
Last edited by Kloschüssel; 09-27-2010 at 01:26 PM.
- 09-28-2010 #3
- Join Date
- Feb 2009
Thank you for your reply and detailed outline. Unfortunately I needed to have the server on a differ subnet and the client pc on a differ subnet. ip forwarding on the router to route to both gateways. I figured out that i needed to install dhcpd package and then configure the dhcrelay to relay the broadcasts!! I was able to figure it out.
- 09-28-2010 #4
I didn't know of dhcrelay and I just read up the manuals about it. In case where you need distinct subnets, it surely is one of the best solutions. Thanks for the hint.