If you try to set a trap destination in your GECKO you might get an error message "invalid IP address".

This usually happens if you have updated your GECKO from firmware versions <02.3.x.
The reason for this are the pre-populated fields with 0.0.0.0. The default values have been changed and as of 02.3.x the trap receiver IP address is empty by default.  As a workaround you can delete all entries with 0.0.0.0 and then set your intended trap receiver IP. 

If you start from factory defaults in v02.3.x this does not show up.