Multicast Support

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.

Example 3-5. Multicast Configuration Options on BSD

options MROUTING # mrouted (DVMRP)

options PIM # PIM-SMv2/PIM-DM

Example 3-6. sysctl Multicast Parameter

[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