I've come up with a solution to my problem, but not sure it is the best. The problem I've got is that my college has the entire campus setup on one physical network with 3 class C blocks. The classroom machines get IP addresses from the dhcp server, but it is totally random, some will get addresses from the 71 block, and others from the 73 block. For using the internet, that isn't a problem, but for machine to machine access, it presents one. The only link between the class C networks is a 10MB router, so any communication between Class C networks drops to 10MB instead of the 100MB. Transfers between machines in same Class C can go as high as 8MB, whereas different Class C's drops to a max of about 400KB. Since everything is on a single physical network, I've added special routing entries for Windows, and now want to do the same for Linux. I used a simple basic program in Windows, but seem to get the same results with this script in Linux ip=`ifconfig eth0 | grep Mask | cut -c21-35` route add -net 202.128.71.0/24 gw $ip route add -net 202.128.73.0/24 gw $ip route add -net 202.128.72.0/24 gw $ip It gets the ip address from the ifconfig, and then creates routes for all three networks, since I don't know what IP address a machine will get. The machines boot in 98, XP, or Linux, and I've also used G4U BSD for copying. I've seen machines get 4 different IPs booting up with one after another, but sometimes 2 of the 4 will be the same. About 5 years ago, when I was running the student labs, I had separate segments for each classroom, and only had public IPs on the 4 servers. Then the ADMIN MIS took over everything, and moved it to a single physical network. I've even got a Linux Fedora machine setup with 9 Ethernet ports, one connected to the backbone, with the other 8 ports setup for separate private IP blocks with DHCP behind the IPTABLES firewall. Only problem is that I only have 1 machine in my office hooked up to one port. Thanks for any suggestions. +----------------------------------------------------------+ Michael D. Setzer II - Computer Science Instructor Guam Community College Computer Center mailto:mikes@xxxxxxxxxxxxxxxx http://www.guam.net/home/mikes Guam - Where America's Day Begins +----------------------------------------------------------+ http://setiathome.berkeley.edu Number of Seti Units Returned: 14,808 Processing time: 29 years, 160 days, 12 hours, 37 minutes (Total Hours: 257,893)
