Apple Airport Extreme / Time Capsule ‘Enable Default Host’ option

Hey,

So this is the setup... I've got a Time Capsule and I've set the 'Enable default host' option which, from what I understand, redirects ALL traffic unaltered to a given IP address.

All works as expected i.e. not a lot of traffic before to loads of traffic after activating. However, all the traffic now has the default host IP address removing the intended machines IP address.

I would like to know if the original intended machines IP address is preserved in the data and if so the name of the column I can apply. Sounds like a bit of a long shot but it would help identify the machine receiving the packet.

Thanks for help.