Sparc platform development envrionment using Qemu

Hello all,
I'm trying to install an efficient compile environment on a Windows XP Box.
What works so far :
- QEmu sparc (from binary package)
- the "readynas_compile_environment.qcow" boots OK
- I can login on the guestOS as root
- Outgoing network from guest works OK on the overall
What doesn't work :
- I can't ping host OS from guest BUT a can ping the computer nextdoor on the physical net
- I tried "-redir" option on qemu command line to get guest OS sftp access to no avail.

I must say my XP box has got weird network settings (3 static IP on the same NIC, vmware virtual network adapters, IPv6 tunneling adapter), it could be the reason why guest OS cannot ping it.

If anyone had a solution that would allow me to put/get files/folder/archives on the guest, I would very much appreciate. Accessing guest file system from host would be prefered as it would be a bit more user friendly.