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Re: [Qemu-devel] network fails on windows

From: Julian Seward
Subject: Re: [Qemu-devel] network fails on windows
Date: Sat, 17 Jul 2004 16:21:44 +0100
User-agent: KMail/1.6.2

I agree, there is something funny to do with networking with
WinXP/Win2K guests.  I use user-mode networking with the
current cvs head.  Sometimes XP is able to make a connection
to the outside world; yet if I just leave the guest machine
idle and try an hour later then it can't; try again 5 minutes
later and it's OK again.  It's very frustrating.  I have no idea
what's happening.  Also, even when it can communicate with 
other machines on my local network, it's really slow.

Wierd thing is, running Red Hat 7.3 as a guest, with user-mode
networking, the guest's connections to the outside world are
both reliable and fast.  Which corresponds with Matthias' observation.

Any ideas?  Has anyone else got any related observations?


On Saturday 17 July 2004 16:07, Matthias Jung wrote:
> Hi,
> i have found a bug: for long I was not able to use the network part of
> qemu, I tried almost everything to get a guest Windows LAN access, nothing
> worked. Neither tun nor user-net was working, no matter how hard i tried,
> and only Windows seemed to have this problem, linux guests always performed
> fine. -isa didnt help either.
> I was just on the verge of giving up until i tried one last thing:
> I switched the mac address parameter. Til then I had used the mac
> a3:b2:23:54:7e:cf which is a valid mac and windows did detect the interface
> without flaws, but no network access was possible.
> With 00:ff:7f:fc:36:d2 it suddenly worked, I only can imagine a bug in the
> ne2000 windows driver, or in windows (95,98,2000 tested) itself, not
> allowing such a mac.
> I had no mac collision at any time!
> happy that its finally working,
> Matthias Jung
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