[ixp1200] chapter 8 ethernet header problem

Hi, I was running the chapter 8 example on develper's workbench in simulation mode. The packet with ethernet addresses 'cafebabe' and 'deadbeef' arrives in sdram correctly but when the structure headerData in datawatch shows the first word of the quadword '0000cafe' repeated over and over again . it does not show the correct ethernet addresses.Can anyone tell me what is the problem? thanks, shweta