[Samba] having problem with multipale interfaces

[najeeb]

Hi, 

I am having some prob with my samba. I am runing samba as a PDC and one 
one interface it works better when I put another interface as I have 
more networks it gives me a message that the following domain is not 
avaliable. I don't know what prob it can be I have changed smb.conf 
many times with the follwing but still not able to get it work.

interface=172.168.0.0/24 172.168.8.0/24

and with this also I have tried

interface= eth0

but still it doesn't work I don't have for the time being any firewall 
on my network I can ping the other network client from samba but can't 
conect it with samba. I am really worry about it what it can be plz 
help me out with this. I will be really thank full to you people.
thanks in advance