This one has me stumped. The CentOS Server's main services are HTTP, Samba, and DNS. I can copy files from Server to Set B no problem, and from Set B to Server no problem. I can copy files from Set A to Server no problem, but as soon as I copy a file from Server to Set A, it cripples every machine connected to the 10/100 ports on that switch. They loose total connection. The file transfers goes along fine at ~12 MB/s which is great, and as soon as it finishes, all the other computers can use the network again.
I can copy files amongst computers between Set A and Set B.
The weirdest thing is that I can go from Set A to Server just fine, but not Server to Set A.
I've tried swapping out all the switches and cables, same thing. I am using Cat5e everywhere.
Any help on this would be great!