qpimd aims to implement a PIM (Protocol Independent Multicast) daemon for the Quagga Routing Suite. Initially, it targets only PIM SSM (Source-Specific Multicast) mode as defined in section 4.8.2 (PIM-SSM-Only Routers) of RFC 4601. In order to deliver end-to-end multicast routing control plane, qpimd includes the router-side of IGMPv3 (RFC 3376).
sessiond allows a cluster of SSL/TLS servers to share their session caches in order to prevent each node of the cluster from negotiating a separate session. SSL/TLS session is basically a set of secret values (symmetric encryption keys, MAC secrets) shared between a client and a server. The use of asymmetric cryptography required to establish new sessions is the main performance bottleneck of the SSL/TLS protocol.