Question

I need some advises and suggestions for handling the following setup

1 - www.mysite.com : My main landing page will be a WordPress template (Hosted at BlueHost)

2 - www.mysite.com/ask : will be my StackExchange in English (Hosted at FogCreek)

3 - www.mysite.com/fr : landing page for French users (same as 1 but in French - Hosted at BlueHost)

4 - www.mysite.com/fr/ask : will be my StackExchange in French (Hosted at FogCreek)

How my DNS should be setup : CNAME & A records

Answer 1

It might be easier to use sub-domains.

1. www.mysite.com (Wordpress)
2. ask.mysite.com (SE)

If you are willing to buy a French domain, why not get www.mysite.fr for 3, and ask.mysite.fr for 4? Otherwise you could just have:

1. fr.mysite.com
2. ask.fr.mysite.com

The reason why I suggest sub-domains is because SE uses the whole domain.

Answer 2

can you not do this with DNS Masking

http://www.kickdeveloper.com/api/index.php/DNS_Masking