IPv6 multicast address for all nodes on network

The right address to multicast to all nodes on a link is ff02::1%<interface>. You probably forgot the interface ID, which is required for link-scoped addresses.

For example:

# ping6 ff02::1%br0
PING ff02::1%br0(ff02::1) 56 data bytes
64 bytes from fe80::6e62:6dff:fed1:dfad: icmp_seq=1 ttl=64 time=0.052 ms
64 bytes from fe80::5054:ff:fede:b69c: icmp_seq=1 ttl=64 time=0.455 ms (DUP!)
64 bytes from fe80::5054:ff:fe90:de19: icmp_seq=1 ttl=64 time=0.650 ms (DUP!)
64 bytes from fe80::6e62:6dff:fed1:dfad: icmp_seq=2 ttl=64 time=0.046 ms
64 bytes from fe80::5054:ff:fe90:de19: icmp_seq=2 ttl=64 time=0.203 ms (DUP!)
64 bytes from fe80::5054:ff:fede:b69c: icmp_seq=2 ttl=64 time=0.241 ms (DUP!)
64 bytes from fe80::6e62:6dff:fed1:dfad: icmp_seq=3 ttl=64 time=0.064 ms
64 bytes from fe80::5054:ff:fe90:de19: icmp_seq=3 ttl=64 time=0.237 ms (DUP!)
64 bytes from fe80::5054:ff:fede:b69c: icmp_seq=3 ttl=64 time=0.254 ms (DUP!)
^C
--- ff02::1%br0 ping statistics ---
3 packets transmitted, 3 received, +6 duplicates, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.046/0.244/0.650/0.189 ms

Addresses in ff01::/16 are for interface-local multicast, which is only really useful to multicast to the local host.

References: RFC 4291