# # The Linux Kernel MFC (Multicast Forwarding Cache) # # Check Linux kernel multicast interfaces: cat /proc/net/dev_mcast # Check that interface eth0 is forwarding multicast: cat /proc/sys/net/ipv4/conf/eth0/mc_forwarding # Check Linux kernel multicast VIFs: cat /proc/net/ip_mr_vif Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote # Check Linux kernel MFC: # Oifs format = vifi:TTL cat /proc/net/ip_mr_cache Group Origin Iif Pkts Bytes Wrong Oifs # iproute2 can display the MFC: ip mroute show (2.2.2.2, 239.2.2.2) Iif: eth1 Oifs: eth0 # -- end-of-file --