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[7.403]Reverse-dns doesn't work

I am unable to use nslookup. It seems that reverse dns doesn't work at all. I've searched both the kb and old threads and I think I need to define something on the request routing tab. I have no issue "talking" to the devices within the network. 
I don't have an internal DNS server.(reverse-dns issue is not related to the current firmware version)
Could you please advice on how to proceed?


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