If the trb500 is started when the following device is already running, the device behind it gets an address of the defined LAN instead of the public IP address, despite passthrough being activated. (Double NAT). It only gets the correct address if the Ethernet cable is interrupted for about 1 minute.
Config:
if device was not active during trb500 start it works
if device was active during trb500 start it gets the wrong ip
To prevent that, set a short lease time (like 2-5 minutes) in both the DHCP service and in the settings for passthrough.
Then the device will re-request the DHCP lease soon, and it will notice that it has changed.
When the DHCP service has a long lease time (like 1 day) that is no way for the TRB500 to tell the device “hey, the user has changed my setup and now you need to re-request the lease” except for unplugging of the cable.
(well, in reality the TRB500 could simulate the unplugging of the cable, and I have requested that as a new feature some weeks ago, but at the moment that is not possible)
hello jansen
many thanks for the quick reply, I have now set the reading time for both to 5 minutes. Now I got the correct IP after 5 minutes as expected. 
Regards Tom
Usually you will get an address update after at most half of the lease time, so 2.5 minutes when you have set it to 5.
thank you very much works great
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