Date: Mon, 3 Nov 2008 22:18:31 -0300 From: Mario Lobo <mlobo@digiart.art.br> To: freebsd-questions@freebsd.org Subject: Qemu network question Message-ID: <200811032218.32267.mlobo@digiart.art.br>
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Hi:
Please use a fixed font to see the diagram bellow:
FBSD HOST(7.1-PRERELEASE)
+-----------------+
| 10.10.10.1 |=20
LAN -+----- re0 |=20
| |=20
| +-----+ |
+---+----+tap0 | | =20
| ++----+tap1 | |=20
| || +-----+ | =20
| || bridge0 | (if_bridge)
| || 192.168.100.254 | =20
| |+-----------------+
| |
| | QEMU GUEST 1 (linux Fedora core 5)
| | +-----------------+
| | | |
| +---+---- eth0 |=20
| | 192.168.100.1 |=20
| | |=20
| +-----------------+=20
| QEMU GUEST 2 (windows XP)
| +-----------------+
| | |
+------+--- realtek |=20
| 192.168.100.2 |=20
| |=20
+-----------------+=20
It's working like a charm !=20
I turned my FBSD desktop into a router/gateway, put pf to nat everything an=
d=20
set up an independent smb server on the host. Pings travel on any direction=
!.=20
The guests have access to ALL the host's files and vice versa, BOTH guests=
=20
have internet access and best of all, I can access the linux guest through =
an=20
ssh shell and the windows guest through vncviewer, and, of course, the 2=20
guests see each other ! Imagine how happy I am !
I tried this without turning my desktop into a gateway. The guests had=20
internet access but the host was invisible to them and I got tired of tryin=
g=20
to make qemu's -smb option work, so I adapted this "a-bit radical" approach=
I=20
saw on a how-to for Sun OS I found on the net.
I'm really impressed with qemu performance !. I=B4ve compiled kernels, buil=
t=20
RPMs and the reduction in performance from doing these things in a separate=
=20
machine is really endurable.
My question is: If I don't put re0 into promiscous mode, all of this falls=
=20
apart ! The network goes totally down for the host<->guests, but the host=20
retains its internet conectivity. I discovered that by chance! I was trying=
=20
to find out what was happening with conectivity so I tried pinging the host=
=20
from the linux guest. As soon as I started tcpdump on the host, the pings=20
went through so I found out what I needed from there.
Is this normal or is there something wrong with my NIC? setup?
Thanks,
=2D-=20
Mario Lobo
http://www.mallavoodoo.com.br
=46reeBSD since version 2.2.8 [not Pro-Audio.... YET!!] (99,7% winedows FRE=
E)
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