I have one issue that I am hoping you can help me with. After thoroughly researching this issue I can''t seem to find any solution to the following situation in our school lab setup: The server is Gateway/Firewall/DHCP server IPTables ver: 1.2.6a Kernel: 2.4.18 (Red Hat) Cable Modem (with DHCP for external address) Internal network: 192.168.1.0/24 Internal interface: eth0 External interface: eth1 Internally we use DHCP service to allocate ips to the student PCs. (192.168.1.0/24) mask (255.255.255.0) Internal Clients: Student laptops Classroom lab purpose: We have a lab setup for students to use their laptops. The students bring their laptops to the lab and connect to the network to download their homework and study material, or to take exams/quizes. Classroom lab setup: The lab is using the network layout described above with the Linux server as the Gateway, Firewall, and DHCP server; and the internal network is configure to use the 192.168.1.0/24 network. We have students who bring their own laptops from home; some laptops are DHCP enabled and others are using static configuration per their home network. Things work great for students with their the laptops enabled with DHCP. We run into problems where the laptops are not using DHCP, they have trouble talking on the network to the servers. Goal of what I am trying to do: I would like to use iproute2 and iptables to dynamically nat any ip that is not using an ip in the 192.168.1.0/24 network; so that any non 192.168.1.0/24 ip gets natted by iproute2 or iptables to 192.168.1.0/24 network and hence can talk on that network to other machines and use the Linux Gateway (192.168.1.1) to access the internet to do research while in class. I''ve heard that expensive Cisco routers are able to do this and so am hoping Linux is able to do this as well since our budget is tight and can''t afford the expensive hardware. The key here is to basically nat any ip that is not using the 192.168.1.0/24 range so that we can allow them to talk on the 192.168.1.0/24 network transparently. Any help is greatly appreciated. Thanks in advance -- _______________________________________________ Sign-up for your own FREE Personalized E-mail at Mail.com http://www.mail.com/?sr=signup _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/