The figure shows the current IPv6 Multicast network at the University of Copenhagen. The given IPv6 addresses will all have the prefix 2001:0878::/32

The 2 FreeBSD machines act as IPv6 routers for Unicast and Multicast. Between the two machines an IPv6 tunnel over IPv4 has been established.

A similar setup may be used to give IPv6 access over IPv4  to other places without a direct IPv6 connection. 

Multicast Dbeacon servere.

Implementation and Deployment of IPv6 Multicasting

Example:

The following lines are used to configure one end of an IPv6 tunnel over IPv4 for a FreeBSD 6.2. It supports both uni- and multicast. 

### IPv6 options: ###
ipv6_enable="YES" 
ipv6_gateway_enable="YES" 

ipv6_ifconfig_fxp0="2001:878:100:1::9 prefixlen 64"
ipv6_ifconfig_xl0="2001:878:100:12::3 prefixlen 64"

gif_interfaces="gif0"
gifconfig_gif0="130.225.126.142   192.38.97.132"
ipv6_ifconfig_gif0="2001:878:100:99::2   2001:878:100:99::1 prefixlen 128"

The XORP program is used for the IPv6 routing. It requires the following additional software: GNU make-3.81 and Python-2.5.1 for the build and test of XORP. The following config.boot configuration file is used:

protocols {
   mld {
        disable: false
        interface fxp0 {
            vif fxp0 {
                disable: false
                version: 2
                enable-ip-router-alert-option-check: false
                query-interval: 125
                query-last-member-interval: 1
                query-response-interval: 10
                robust-count: 2
            }
        }
        interface xl0 {
            vif xl0 {
                disable: false
                version: 2
                enable-ip-router-alert-option-check: false
                query-interval: 125
                query-last-member-interval: 1
                query-response-interval: 10
                robust-count: 2
            }
        }
        interface gif0 {
            vif gif0 {
                disable: false
                version: 2
                enable-ip-router-alert-option-check: false
                query-interval: 125
                query-last-member-interval: 1
                query-response-interval: 10
                robust-count: 2
            }
        }
    }
    pimsm6 {
        disable: false
        interface fxp0 {
            vif fxp0 {
                disable: false
                enable-ip-router-alert-option-check: false
                dr-priority: 1
                hello-period: 30

                hello-triggered-delay: 5
            }
        }
        interface xl0 {
            vif xl0 {
                disable: false
                enable-ip-router-alert-option-check: false
                dr-priority: 1
                hello-period: 30
                hello-triggered-delay: 5
            }
        }
        interface gif0 {
            vif gif0 {
                disable: false
                enable-ip-router-alert-option-check: false
                dr-priority: 1
                hello-period: 30
                hello-triggered-delay: 5
            }
        }
        interface "register_vif" {
            vif "register_vif" {
                disable: false
                enable-ip-router-alert-option-check: false
                dr-priority: 1
                hello-period: 30
                hello-triggered-delay: 5
            }
        }
        static-rps {
            rp 2001:878:100:1::9 {
                group-prefix ff1b::/16 {
                    rp-priority: 192
                    hash-mask-len: 126
                }
            }
        }
        static-rps {
            rp 2001:878:100:9::1 {
                group-prefix ff7b::/16 {
                    rp-priority: 192
                    hash-mask-len: 126
                }
            }
        }
        bootstrap {
            disable: false
            cand-rp {
                group-prefix ff1b::/16 {
                    is-scope-zone: false
                    cand-rp-by-vif-name: "fxp0"
                    cand-rp-by-vif-addr: 2001:878:100:1::9
                    rp-priority: 192
                    rp-holdtime: 150
                }
            }
        }
    }
    static {
        disable: false
        route ::/0 {
            next-hop: 2001:878:100:1::1
            metric: 1
        }
        route 2001:878:100:11::/64 {
            next-hop: 2001:878:100:12::1
            metric: 1
        }
        route 2001:878:100:14::/64 {
            next-hop: 2001:878:100:99::1
            metric: 1
        }
        mrib-route ::/0 {
            next-hop: 2001:878:100:1::1
            metric: 1
        }
        mrib-route 2001:878:100:14::/64 {
            next-hop: 2001:878:100:99::1
            metric: 1
        }
    }
}
fea {
    unicast-forwarding6 {
        disable: false
    }
}
interfaces {
    restore-original-config-on-shutdown: false
    interface fxp0 {
        disable: false
        discard: false
        description: ""
        default-system-config {
        }
    }
    interface xl0 {
        disable: false
        discard: false
        description: ""
        default-system-config {
        }
    }
    interface gif0 {
        disable: false
        discard: false
        description: ""
        default-system-config {
        }
    }
}
plumbing {
    mfea6 {
        disable: false
        interface xl0 {
            vif xl0 {
                disable: false
            }
        }
        interface fxp0 {
            vif fxp0 {
                disable: false
            }
        }
        interface gif0 {
            vif gif0 {
                disable: false
            }
        }
        interface "register_vif" {
            vif "register_vif" {
                disable: false
            }
        }
    }
}