: A popular discrete-event network simulator for internet systems.
You can find comprehensive guides for version 16.1 on document-sharing platforms: download opnet modeler 16.1
OPNET Technologies was acquired by Riverbed Technology in 2012. Following the acquisition, the standalone "OPNET Modeler" was rebranded and integrated into the suite (and later, Riverbed Modeler). The official download links for older, standalone versions like 16.1 were largely removed from public access and migrated to a private customer portal. : A popular discrete-event network simulator for internet