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  • The switches are on different subnets. The CentOS computer doesn't have access to the DHCP server through switch 1. All of the RHEL machines through switch 1 are connected to the same DHCP server and we don't have administrative access to it. Commented Apr 16, 2014 at 22:58
  • Well, you could manually assign an IP to the CentOS nic on switch 1 in the same subnet as the RHEL machines and then it could talk to them. Then on the nic on switch 2 you could either manually assign or use DHCP to get an IP for Internet access. Commented Apr 17, 2014 at 4:25
  • Yes, well IT doesn't want the CentOS machine on the same subnet as the RHEL machines because the RHEL machines are department managed and the CentOS machine is managed by my group. IT fears that having the CentOS machine managed by us and on the same subnet could introduce a security hole in their system because my group would be responsible for insuring the CentOS machine is secure (IT can't trust us to fully ensure this). Given that knowledge is that anything you can see that would work? Commented Apr 17, 2014 at 14:15
  • If the CentOS machine is not on the same subnet as the RHEL machines then you will have to go thru a router for them to talk. Switch 1 may have this functionality but from what you said IT prob. wont do this for you. You could connect from the RHEL machines (presumably on the Internet) to the public IP of the CentOS machine. This is kind of silly, going out to the Internet and back in, but it probably would satisfy your IT guys as the traffic would have to go through their firewalls. Commented Apr 17, 2014 at 15:12
  • MERM, I'm thinking what you mentioned already takes place, but not sure. The RHEL machines and CentOS machines can talk to each other, but through some higher level interface (of which I am not sure what exists). I want their to be a faster method of data transfer between the CentOS machine and the RHEL machines by connecting the second NIC of the CentOS machine to the same switch as the RHEL machines. Right now the connection when transferring files is relatively slow (much slower than transferring data between RHEL machines). Commented Apr 17, 2014 at 15:17