Hi Terence,
did you try with a config like this (example)?
ip dhcp pool TEST
network 10.0.0.0 255.255.255.0
default-router 10.0.0.1
dns-server 10.1.1.10
domain-name your-domain.com
and then just add option 43 in either hex or ascii:
option 43 ascii “Comma Separated IP Address List”
option 43 hex "hex string"
I hope that helps.
Regards,
Markus