I have a two-site domain (call them Local and Remote). Site Local has our main IT infrastructure, including two Active Directory Domain Controllers (2008R2). We're trying to set up an RODC at site Remote, which for the most part works just fine. Everything is replicated, password replication follows the policy, the remote DC answers queries - so all good. Except that machines in site Local, when querying the AD, are referred to site Remote. If I do a tcpdump, I see the LDAP query hit both of the Local DCs, and then go on to the Remote RODC.
I've ensured that all of the subnets on both ends are configured in the Site and Services snap-in, and that the DCs are both in their respective sites. According to my research, that should be all that's required for the clients to query the closest DC. Have I missed a step?