[IPv6] How do I configure multiple interfaces in radvd?

Hi,

I have made a few attempts to configure multiple interfaces in radvd
in a way similar to the following:

interface eth0
{
........................

};

interface eth1
{
........................
};

But then I keep getting a syntax error message in the log regarding
the line "interface eth1". Consequently, of course, the
autoconfiguation won't work for eth1 (although eth0 still works).

What did I do wrong? How am I supposed to configure multiple
interfaces into radvd?

Thanks very much in advance.

Regards,

Patrick