WPMU Ping?

pry a very specific questions, can anybody help me?

I am using the donncha domain mapping plugin:

somedomain.com -> subdomain.myblog.com

For many things, the blog uses the mapped domain, but what about the ping? Did anyone check that?

Thanks,
cooooookies

Ping is done through the database so you can add list there

new plugin just released also from wpmu premium that does it better than wp vanilla