Our accounts in our lab are all mounted over NFS and are accessible over all the systems in a subnet. So, effectively we can ssh into any of the machines in the subnet and continue our work. The problem is that the machines come up or go down randomly because of people accidently turning it off etc. To find running machines I scan the subnet using nmap and choose a machine.
Because of the above problem, I can't put a fixed entry for Hostname in my ssh config entry. So, how can I have an ssh config entry that will have all other parameters except Hostname such that the ssh config entry and the Hostname can somehow be given together while running ssh?