INET Framework for OMNeT++ to simulate network communications.
INET Framework is an open-source OMNeT++ model suite for simulating wired, wireless and mobile networks.
INET contains models for the Internet stack (TCP, UDP, IPv4, IPv6, OSPF, BGP, etc.), wired and wireless link layer protocols (Ethernet, PPP, IEEE 802.11, etc), support for mobility, MANET protocols, DiffServ, MPLS with LDP and RSVP-TE signalling, several application models, and many other protocols and components.