While working through some of the previous tutorials about the CORE Network Emulator or IPv6, we noticed some strange broadcast packets in the Wireshark packet analyzer that appeared to have nothing to do with the processes running on the simulated network.
Messages injected into the simulated network by the host Linux system
For example, we started a simulation consisting of two nodes connected to the same switch. We started the Wireshark packet analyzer on one of the nodes. No processes are running on the nodes that would generate data traffic on the links between them so we should see no data packets in the packet capture shown above. However, we see many broadcast frames carrying mDNS, NDP, and DCHP requests.
Data passing between simulated nodes in CORE is mixed up with other data packets generated by the host Linux system. Read on to learn how we stop this distracting data.