) for a site I've got hosted, but I still get the domain registrar parking page. ) Ubuntu doesn't cache dns records by default so unless you've installed a dns cache there isn't anything to clear.
I'd like to see if the problem is Ubuntu's cached DNS records. DNS records are likely cached by your provider's DNS servers so if you want to check if the DNS changes you made were successful you can interrogate a DNS server from your domain hosting service with dig: .
Windows Server 2003 components that require name resolution will attempt to use this DNS server before attempting to use the previous default Windows name resolution service, Windows Internet Name Service (WINS).
Windows Server 2003 DNS is also commonly deployed as a non-Active Directory, or standard, Domain Name System solution, for the purposes of hosting the Internet presence of an organization, for example.
DNS originated in the early days of the Internet when the Internet was a small network established by the United States Department of Defense for research purposes.
The implementation of DNS — Berkeley Internet Name Domain (BIND) — was originally developed for the 4.3 BSD UNIX Operating System.
The Microsoft implementation of DNS became a part of the operating system in Microsoft Windows NT Server 4.0.
You can check your machine and various configuration directories to check you're on the same page.