[Lguest] Need help for networking inside lguest

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Help

I need some help in order to use networking inside lguest.

I always get some strange errors, and networking doesn't work.

I tried the http://xm-test.xensource.com/ramdisks/initrd-1.1-i386.img
image.

I modprobe tun.
I lanch lguest as root:
lguest --tunnet=10.0.2.15 --block=initrd-1.1-i386.img 48
/usr/src/linux/arch/i386/boot/bzImage root=/dev/vda ro

And networking at best doesn't work at all, and at worst crash lguest.

Here is what I did:
I check that the tap0 interface exist: It exist and it has 10.0.2.15 IP.

Inside lguest, I type:
ifconfig eth0 10.0.2.2
ping -c 2 10.0.2.15
PING 10.0.2.15 (10.0.2.15): 56 data bytes

--- 10.0.2.15 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss

A tcpdump inside the host show me:
root at slackwall:~# tcpdump -n -i tap0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap0, link-type EN10MB (Ethernet), capture size 96 bytes
10:12:53.097598 arp who-has 10.0.2.15 tell 10.0.2.2
10:12:53.136157 arp reply 10.0.2.15 is-at 00:ff:91:46:d5:ea
10:12:54.096546 arp who-has 10.0.2.15 tell 10.0.2.2
10:12:54.096621 arp reply 10.0.2.15 is-at 00:ff:91:46:d5:ea
10:12:55.096637 arp who-has 10.0.2.15 tell 10.0.2.2
10:12:55.096712 arp reply 10.0.2.15 is-at 00:ff:91:46:d5:ea
10:13:38.271076 arp who-has 10.0.2.15 tell 10.0.2.2
10:13:38.271148 arp reply 10.0.2.15 is-at 00:ff:91:46:d5:ea

It should be Ok, but ir don't work.

I then figured that the Mac address of the interface tap0 is the same as the
interface inside lguest.
I tried a
@%@%> ifconfig eth0 down
@%@%> ifconfig eth0 hw ether 00:FF:91:46:D5:EB 10.0.2.2 up
@%@%> ping -c 2 10.0.2.15
PING 10.0.2.15 (10.0.2.15): 56 data bytes
virtio_net 1: id 0 is not a head!
lguest: Guest moved used index from 23 to 160
root at slackwall:~#

And I come back inside the host! 

I tried to change the mac address inside the host but with no luck, it still
doesn't ping.

I tried to arping 10.0.2.2 from host, and still no reply.

So here is my questions:
-is it normal that the tap0 and eth0 inside lguest share the same MAC?
-How can I setup my networking?
-Do you have any lead? The lguest.txt just says it works, but I don't know
where to search.

Thanks for helping.

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