Linux and BSD operating systems are easily multicast-enabled with two kernel configuration entries. For a detailed discussion of kernel-space and user-space multicast tools, see Chapter 14, "Multicast Architectures."
Example 3-5 shows related kernel configuration lines for BSD, and Example 3-6 shows the relevant sysctl Linux parameters.
options MROUTING # mrouted (DVMRP)
options PIM # PIM-SMv2/PIM-DM
[root@callisto:~#] sysctl -a | grep igmp net.ipv4.igmp_max_memberships = 20 [root@callisto:~#] sysctl -a | grep mc net.ipv4.conf.pimreg.mc_forwarding = 1 net.ipv4.conf.ipsec0.mc_forwarding = 0 net.ipv4.conf.eth1.mc_forwarding = 1 net.ipv4.conf.eth0.mc_forwarding = 1 net.ipv4.conf.lo.mc_forwarding = 0 net.ipv4.conf.default.mc_forwarding = 0 net.ipv4.conf.all.mc_forwarding = 1 net.ipv4.neigh.pimreg.mcast_solicit = 3 net.ipv4.neigh.ipsec0.mcast_solicit = 0 net.ipv4.neigh.eth1.mcast_solicit = 3 net.ipv4.neigh.eth0.mcast_solicit = 3 net.ipv4.neigh.lo.mcast_solicit = 3 net.ipv4.neigh.default.mcast_solicit = 3 [root@callisto:~#] sysctl -a | grep pim net.ipv4.conf.pimreg.arp_filter = 0 net.ipv4.conf.pimreg.tag = 0 net.ipv4.conf.pimreg.log_martians = 0 net.ipv4.conf.pimreg.bootp_relay = 0 net.ipv4.conf.pimreg.medium_id = 0 net.ipv4.conf.pimreg.proxy_arp = 0 net.ipv4.conf.pimreg.accept_source_route = 1 net.ipv4.conf.pimreg.send_redirects = 1 net.ipv4.conf.pimreg.rp_filter = 0 net.ipv4.conf.pimreg.shared_media = 1 net.ipv4.conf.pimreg.secure_redirects = 1 net.ipv4.conf.pimreg.accept_redirects = 1 net.ipv4.conf.pimreg.mc_forwarding = 1 net.ipv4.conf.pimreg.forwarding = 1 net.ipv4.neigh.pimreg.locktime = 100 net.ipv4.neigh.pimreg.proxy_delay = 80 net.ipv4.neigh.pimreg.anycast_delay = 100 net.ipv4.neigh.pimreg.proxy_qlen = 64 net.ipv4.neigh.pimreg.unres_qlen = 3 net.ipv4.neigh.pimreg.gc_stale_time = 60 net.ipv4.neigh.pimreg.delay_first_probe_time = 5 net.ipv4.neigh.pimreg.base_reachable_time = 30 net.ipv4.neigh.pimreg.retrans_time = 100 net.ipv4.neigh.pimreg.app_solicit = 0 net.ipv4.neigh.pimreg.ucast_solicit = 3 net.ipv4.neigh.pimreg.mcast_solicit = 3