#
# 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 --
