[CentOS] how to let other people know my hostname through IP address

Thu Jul 27 01:00:07 UTC 2006
dxuranus <dxuranus at gmail.com>

> >   i have a public hostname "a" (not my machine name)on internet and
> my
> > ip is xx.xx.xx.xx;
> >   the problem is other people can get my ip through hostname.but if
> he
> > try to get my hostname through ip he always failed.
> >   the case above is in my program (i make it) ,what can i do for
> this?
> 
> This is not a CentOS issue. You need your ISP to set your "reverse
> DNS".
> Depending on your ISP, they may not do this for customers at all.
> 
> 
did you know qmail ,he can achieve this by local software.i guess the
process of dns reserve is like this:the remote pc first try to get
information from you if failed he try with your ISP.is this right?
but i do't know what kind of protocal it ues when remote pc contact
you,and i think i just need fellow the protocal make some code and then
i can do what qmail can!
thanks for any help!