I've read through a few posts here and on various blogs and have been on the phone with my host for a couple hours, so not sure if I am trying something impossible, or if I'm coming at it from the wrong angle.
blog1 = oldsite.com
blog2 - oldsite.com/newsite -> I want to be reached from newsite.com
I've installed the Domain Mapping plugin, I've added the ip address to the Domain Mapping Page. I've indicated the domain (with and without www) under Domains for Blog 2.
Per advice of hosting company, I have newsite.com on the same hosting account as oldsite.com pointing to the root directory. When I navigate to newsite.com it is redirecting to oldsite.com.
My host thought that there are too many redirects, so newsite.com is getting to oldsite.com but not on to oldsite.com/newsite.
I said that I had read on some forums/posts that you needed to set up parking for that domain, but he said it wouldn't work the server wouldn't know where to go. I was going to try it myself, but it's not one of the options I can set up from my control panel :-p If I am advised here that I do indeed need to remove from oldsite.com hosting and set up as parking, I will get them to do that for me.
When I remove the hosting completely from newsite.com I only get a holding page indicating that the server doesn't know what to do with the domain -- even with A record set up to point to the ip address of oldsite.com
There are only two sites in this 'network' but run by the same client, so if needed I'll move the second site to a separate install. Just thought it'd be easier for him to use the one panel and could add more sites in future if he wanted.