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DHCP fails after DHCPOFFER (VLAN)

I have the UTM configured as the DHCP-server for both the 'regular' traffic and for a VLAN. The latter has its own DHCP-server on the UTM, on the interface for the VLAN.

The log shows the DHCPDISCOVER and DHCPOFFER, but there doesn't seem to be a request from the client after that.

[FONT="Courier New"]2015:05:18-22:03:04 utm dhcpd: DHCPDISCOVER from 00:a6:96:b6:8b:21 via eth0.666
2015:05:18-22:03:04 utm dhcpd: DHCPOFFER on 192.168.6.100 to 00:a6:96:b6:8b:21 via eth0.666[/FONT]

Setup:

UTM (with virtual NIC for VLAN 666) -> Netgear GS108T (port tagging) -> WAP*

* I've tried two old access points I had laying around: a DLINK DIR-655 and a Netgear WNR2000v3.

It seems that either the DHCPOFFER doesn't make it to the client, or the DHCPREQUEST is lost somewhere. (I haven't had a chance to do a tcpdump yet.)

Any ideas?


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