OPENVPN DNS resolution

[xlameee]

I have multiple site to site OPENVPN connections and I ahvn't be able to get the DNS resolution from the other sites.

I have 1 site acting as a server site Let say SiteA then SiteB and SiteC in order to talk from SiteB to SiteC you have to go trough SiteA. Working perfectly but when I try to resolve SiteA and SiteC from B nothing happen. Client sites B and C have a gateway on them but not the server site A