ssg 5 vlan sub int dhcp

Hello,

i have a ssg5 Version 6.3.0 and try to get a dhcp address from a taged sub int.

config:

eth0/4 0.0.0.0/0 NUll

eth0/4.1 192.168.20.1/24 zone 3 tag 3

eth0/4.1 dhcp service server (gw 192.168.20.1 255.255.255.0) lease 1 day

eth0/4.1 dhcp list : type dynamic from 192.168.20.10 - 192.168.20.100

when i connect my notebook with port eth0/4 i receive no ip adress.

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i tried the dhcp configuration with eth0/4 and it worked, but i need to go with sub int because i need to tag it with vlan 3.

any suggestions?

thanks!