Seeking some advice in configuring Bind9

[Terry Tse]

I'm currently using views to run a single copy of BIND9 to serve both 
internal and external clients. There are a number of internal servers 
that use private IP addresses that the internal view properly supplies to 
the internal clients. For external clients, they're forwarded via 
iptables prerouting to the right host behind the firewall. This has been 
working satisfactory for a while.

Recently, I've a host that resides outside or internal network. It's on a 
PPPoE provisoned line whose IP address changes every now and again. To 
bring it into our domain, I've successfully used nsupdate to send secured 
dynamic update to the external view of the zone. However, internal 
clients can't see this address.

Is there a way that this update be also sent to the internal zone 
database?  Or is there a better way to achieve what I want to do? Any 
advice will be welcomed.