problem / in zonename as RFC2317 with bind9

[Thomas Börnert]

hi list,

the second try, sorry for the typos :-(

i would establish a reverse delegation as descriped in
RFC2317. i've the following zone definition

zone "240/28.111.111.111.in-addr.arpa" IN {
        type master;
        file "240.111.111.111.in-addr.arpa";
        allow-transfer { dnsservers; };
};

with bind 9.2 it was running with 9.3 i got the following
error:

zone 240/28.111.111.111.in-addr.arpa/IN: loading master file
240.111.111.111.in-addr.arpa: bad owner name (check-names)

with the option

check-names ignore;

i would working.

also if i replace the / with - it works
as here

zone "240-28.111.111.111.in-addr.arpa" IN {
        type master;
        file "240.111.111.111.in-addr.arpa";
        allow-transfer { dnsservers; };
};

the content of the zone file is:
<----------------------------- snip ------------------------->
$TTL    86400
@               SOA     ns1.mydomain.net. hostmaster.mydomain.net. (
                        2006060201 ; serial
                        43200      ; refresh (12 hours)
                        3600       ; retry (1 hours)
                        3600000    ; expire (5 weeks 6 days 16 hours)
                        86400      ; minimum (1 day)
                        )
                NS      ns1.mydomain.net.
                NS      ns2.mydomain.net.
                NS      ns1.otherdomain.de.
                NS      ns2.otherdomain.de.
                PTR     net.mydomain.de.
                A       255.255.255.240
241             PTR     gate.mydomain.de.
<----------------------------- snip ------------------------->

has everyone an idea what is wrong here ?

Thanks

Thomas