If you have only one machine for this, you might want to look into using 
a VM system such as VMware or Xen or QEMU to create a virtual machine, 
which you can feed packets into from tcpreplay using the virtual MAC of 
the client system and the virtual network (with VMware this might be 
vmnet1 or vmnet8; I'm not sure with Xen or QEMU).  While the packets 
will still be tracked as local on the host system (and thus bypass 
filters) inside the OS on the client VM system, they will appear to be 
external.

If you try this approach I would be interested in hearing how it goes, 
as I may need to do something similar (for a different reason - I have a 
VM-based system that needs to capture all traffic from an interface in 
promiscuous mode, but in order to force it through the virtual bridge, I 
may have to use tcpreplay to edit the destination MAC addresses.

@alex

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