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System we're running over here is a stock kernel RedHat ES 4 server. The question was brought up as, "How would someone be able to determine whether the machine is configured to grab an IP from DHCP or is it set statically and what file or files determines this toggle?"
You could look at /etc/sysconfig/network-scripts/ifcfg-eth0 to see whether or not it is set to use DHCP. Substitute "eth0" for whatever network device you are concerned with.
Well, you could have multiple ethernet devices attached to your systems, so you would have eth0, eth1, etc.
Also, I work in a high-performance computing center, and we have infiniband connected equipment that uses IP over IB. Those interfaces are labeled as ib0, ib1, etc.
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