Linux kernel supports MLDv2 from version 2.4.22, but in all versions up to 2.6.5 MLDv2 ICMP value is wrong.

The value used is 206 and should be replaced by the IANA assigned value: 143.

For this, search /usr/src/linux/include/linux/icmpv6.h for 206 and replace it with 143. Then, just compile the kernel.

In version 2.6.6 this value is correct.