Hi!
Most likely there are router/host which was discovered first by NetXMS and it reporting network mask 255.255.255.0. Because NetXMS server cannot really know who has correct netmask and who not, it assumes that first discovered node connected to some subnet has correct netmask for that subnet. There also possibility that you have incorrectly created subnet object for some reason. How object(s) for subnet in question looks like?
Best regards,
Victor
Most likely there are router/host which was discovered first by NetXMS and it reporting network mask 255.255.255.0. Because NetXMS server cannot really know who has correct netmask and who not, it assumes that first discovered node connected to some subnet has correct netmask for that subnet. There also possibility that you have incorrectly created subnet object for some reason. How object(s) for subnet in question looks like?
Best regards,
Victor