[sudo-sys] our local network - how does it work?

I'm trying to rename tamale.sudoroom.org to door.sudoroom.org. It already works fine from outside the space. From within the space, however: tamale.sudoroom.org resolves to 192.168.1.2 door.sudoroom.org resolves to 50.0.83.116 This means packets to "tamale" get through but packets to "door" just time out. I've already tried changing its hostname and rebooting, but I suspect that a local DNS server is involved here and that we need access to it. It looks like DNS is being served by the Cisco AP running dd-wrt at 192.168.1.49 - is that true? Does anybody have the user/password for that machine?