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Currently many controllers from NI only have one way to deal with a failure to contact a DHCP server - they will try to use a link local address (APIPA). If this too fails (due to Proxy ARP e.g.) the controller will not even start the RT Application (which might have other tasks to do regardless of the lack of netorking and/or might run code that will remedy the IP problem), but go into Safe Mode. This in itself is bad enough and should be changed to allow the application to be run, however the main request / idea I have will fix this indirectly:
- It should be an option to not fall back to APIPA, but to use the last known configuration (as long as the lease time is still valid). If the DHCP server is down the controller will have the IP-configuration it received the last time the server was up, and will use that configuration.
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