DHCP server for different VLANs [closed]

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http://serverfault.com – Possible Duplicate: How do I dynamically obtain IP addresses for VLAN interfaces? I am setting up a dhcp server to supply ip address for different VLANs of different subnet.(192.168.1.x for VLAN100, 192.168.2.x for VLAN200 and likewise for VLAN300)I have created VLANs 100,200,300 on eth0 on the ubuntu machine on which the dhcp server runs.I have configured the dhcp server to hear on all the virtual interfaces eth0.100 eth0.200 eth0.200.But when i run the dhclient for the interface eth0.100 ,how the server will recognize that this packet is from that particular interface? Will the dh ()