In our internal network, a NetBSD PC (2.0_STABLE) runs as gateway 
and DNS server (named).  Others PCs get IP from this NetBSD.

Because some tunnel sub-network is running. for example, a remote VPN
clinet (PC1) is connected with NetBSD, PC1's tunnel IP is 10.9.1.1

When internal PC query PC1's IP, I want NetBSD PC tell them that PC1's IP is 10.9.1.1, not to query external DNS server, How can I do?

I add the item in /etc/hosts, but it doesn't affect.

Thanks.