reverse delegation of subnet

[Thomas Reitelbach]

hello bind-users,

i've got a question about reverse delegating a subnet.
i've got a /29 subnet starting at 62.153.204.64 and have to set up a
reverse zone for that ip-range, but how do i do that?

at this time my zone file is looking like this (maybe it's cutted
because of my email-program):

$ TTL 14D
64.204.153.62.in-addr.arpa.     IN      SOA     frzdaten.troficent.de.
tr.troficent.de. (
                        2000070303
                        10800
                        3600
                        14D
                        64000 )
@                       IN      NS      frzdaten.troficent.de.
@                       IN      NS      ns2.troficent.de.
@                       IN      NS      pns.dtag.de.
@                       IN      NS     
techfac.techfak.uni-bielefeld.de.
68                      IN      PTR     frzdaten.troficent.de.
66                      IN      PTR     ns2.troficent.de.
65                      IN      PTR     pleasure.troficent.de.     

i thought that it would be ok this way, but when i make a nslookup
"nslookup 62.153.204.68" i see the following:

frzdaten:/var/named # nslookup 62.153.204.68
Server:  frzdaten.troficent.de
Address:  62.153.204.68
Aliases:  68.204.153.62.in-addr.arpa
 
Name:    frzdaten.troficent.de
Address:  62.153.204.68
Aliases:  68.204.153.62.in-addr.arpa

why this aliases???
can anyone help me please, this way i have trouble talking to
mailservers and others.

thank you,
thomas