hi all,
spent the evening reading numerous posts on connecting various pieces of hardware to the Chorus ONT's which threw light on the ONT setup side (I'm new to using these).

Our SME setup (very std reqmts: internet, email via own hosted Exchange, PPTP VPN for remote users).
D-Link DFL860E firewall. Need to retain use of this as is core router/firewall providing VPN, vlan, etc functionality for LAN/WAN users.
VF-supplied HG659 router. Fixed IP provided (/32). 
Chorus ONT.
No VLAN 10 tagging nor PPPoE config on firewall as HG659 providing these.

Currently have ONT --> HG659 WAN port / HG659 LAN port (serving DHCP) --> D-Link WAN port (set to reserved IP on HG659).
this is working fine for internet access. Getting 200M up/down (in AKL CBD). 
However, unable to route email / OWA / VPN traffic out or in. Firewall rules altered to route traffic through updated 192.168.1.x WAN int (to HG659). 

Vodafone tech support pretty much useless in providing any decent "corporate" support for using an ONT with a business grade firewall. 

So...
- should the firewall WAN int be set to PPPoE with DHCP? Been unable to so far do this as the physical WAN int settings on the firewall require an IP (catch 22). Yet to delete the WAN int setting and re-add as pure DHCP.
- will that int then pick up the fixed external IP? 

Previous setup at our old location was dark fibre with fixed IP. That IP was then set on the firewall WAN int and all traffic routed in/out no problem. 

how have others out there configured business setups with ONT's? I def would prefer NOT to have to use the HG659 as part of the network given its very basic consumer level functionality / throughput capability. 

thanks in advance / sorry for the extended bleat.