We want to restrict the names.nsf (NAB) replication only between HUB servers.
We have a lot of server around the world and we one HUB server in LATIN - NORTHAMERICA - EUROPE - ASIA.
Subject: Sounds like a bad idea to me.
The direct answer to your question is to set your non-Hub servers to “No Access” in the NAB’s ACL. (Make the change, as usual, on the admin server.) However, I’d recommend against this tactic; it sounds like a terrific way to mess the whole system up by blocking important updates from certain servers. Instead, I’d suggest changing the replication settings on the non-Hub servers’ NABs to be Configuration directories, which will significantly reduce the replication traffic necessary to sync the NAB to those servers – as long as they don’t need to do frequent name lookups (for mail or internet authentication).