Re: ssg 5 vlan sub int dhcp

Thanks for the clarification on the scenario.  I have setup a similar operation in the past to Cisco WAP using the tagged interface.  This is a sample configuration that worked for the DHCP server in that setup.  Just change the interfaces and addresses per your needs.

set interface ethernet0/6.1 tag 3 zone "guest"
set interface ethernet0/6.1 ip 172.16.1.1/24
set interface ethernet0/6.1 route
set interface ethernet0/6.1 ip manageable
set interface ethernet0/6.1 manage ping
set interface ethernet0/6.1 manage snmp
set interface ethernet0/6.1 dhcp server service
set interface ethernet0/6.1 dhcp server auto
set interface ethernet0/6.1 dhcp server option lease 1440 
set interface ethernet0/6.1 dhcp server option gateway 172.16.1.1 
set interface ethernet0/6.1 dhcp server option netmask 255.255.255.0 
set interface ethernet0/6.1 dhcp server option dns1 8.8.8.78 
set interface ethernet0/6.1 dhcp server option dns2 8.8.4.4 
unset interface ethernet0/6.1 dhcp server config next-server-ip
unset interface ethernet0/6.1 dhcp server config updatable