Domain Pointers: How does Google like them?

[cyberfish]

I have a domain name domainname.tld and I also own domain-name.tld and domain-names.tld.

Recently I pointed both of them to the main web site (established with good ranking for three years. I used something called "domain pointer" in my "Direct Admin" control panel.

How does Google see this sort of thing? Could it be perceived as duplicate content?

When I search for backlinks in google for link:www.domainname.tld it returns a number of backlinks. When I use link:domainname.tld it returns the same results as the first one.

However, when I search for link:domain-name.tld (the pointing domain) google finds no backlinks.

Is this normal, or does google think domain pointers are some sort of immoral act?

Any ideas would be appreciated.

[edited by: ciml at 10:20 am (utc) on June 2, 2005]
[edit reason] Examplified [/edit]