ZyXEL → adsl ipoe rfc2684/rfc1483

please i need help for some adsl cpe configurations

with zyxel P660h-t1 v3s i configure in eneth encap adsl mode and my provider give me static ptp subnet /30 and navigation subnet /32 with one ip.

for example static ptp :
a.b.c.111/32 where :
provider gw a.b.c.112
for my wan a.b.c.113
subnet 255.255.255.252

and navigation subnet is a.b.c.d subnet .255

in zyxel ( but at same in netgear or domestic router ) how i can configure navigation ip subnet ??

i can configure it without disable lan and dhcp ??