RV180 no internet in NAT if DHCP off

Hello,
I have a RV180 running behind a DSL-Router, connected to the WAN-Port. I have "internet" in my NAT if I have activated the DHCP. I want to use fixed IPs, so I have turned off the DHCP, than I have no constant conection to the internet.
Any idea?
br

at the RV180.
The RV180 gets a IP from the DSL-Router, that is working.
If the Local Net is working with DHCP, every thing is fine, but if I use static IPs, it is working but only for 5mins.

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