[Samba] aliases not working

[John Dalton]

Suppose I am moving the samba to one server to another, say VIPER 
to JOKER.

In smb.conf I change the 'netbios name = VIPER' to JOKER
and I also want the old name to be seen as well. To do this
I create a netbios aliases = VIPER.

I then stop and start samba, but the aliases is not working.

Is this because the IP address of VIPER is still on the old
server and being used?

Does the aliases name have to be a valid system name or can it
be any made up name? I did this as a made up name and it did not work.

Thanks