Syslog configuration

[Enrico Matteucci - Marcheonline]

Hello!
How can I configure BIND 9.1.2 on my Linux server
to write all log messages by syslog in only one file.

In BIND 8 I used: 

logging {
        channel default_log {
                syslog local1;
                severity info;
                };

but in BIND 9 it doesn't work fine.

Thanks,
Enrico Matteucci