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VLAN bytes not getting transmitted in ethernet packet LPC2468

I use RLARM and MDK for ARM for LPC2468. I prepare an ethernet frame of
type OS_FRAME and send it using "send_frame" in the LPC24_EMAC driver.

Everything is fine but the VLAN part. The same code was transmitting the
VLAN also. I did some modifications in the application data ONLY. But
now the target is stripping off the VLAN.

I directly connect the ethernet port of my laptop to the ethernet port
of the target. So there is no switch or router in between to strip the
packet off its VLAN.

I could verify till the point "frame->data", that VLAN is present in the
apprpriate place.

Any idea why this strange behavior???

-vivek