Script Network Reconfig After CentOS 5->6 Upgrade?

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I need to upgrade a bunch of CentOS 5 servers to 6.x in the near future, mostly keeping the same connectivity and functionality. Are there any tools that will examine a running 5.x box and produce the appropriate /etc/udev/rules.d/70-persistent-net.rules (etc). to make the same box come up with the same interface names with the same IPs it had before?

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