I have a UK Virgin Media Hitron Chita router, which has 5 public IPs and is essentially in modem mode.  You make a single connection from the TP-Link Omada router to the Hitron Chita and then you access the various public IP addresses by routing the traffic via the gateway IP address on the client/LAN side of things.

I need to channel these IP addresses to different parts of my network, which consists of:

ER605 v2.0

OC200 v1.0
SG3428 v2.30

EAP610(EU) v3.0
EAP225(EU) v3.0

At the moment I have different LANs with VLAN IDs.  The majority of traffic will go from the default (first) public IP address and does so right now (everything does, it being the setting on the WAN port).  I need to set some specific nets/profiles (each having their own IP range and DHCP server pool) to route to different gateway IP addresses on the Hitron Chita.

TP-Link just stonewalled me and said it's not possible and there's no timeline for support on this.  Is there some way that perhaps the not so helpful CS rep didn't know about?  Is there a DHCP option I can use to force this somehow?  I'd really appreciate some help on this.

Thanks :)