Using the HTTP server via TAP

[Peter Nguyen]

Sven,

That is quite weird. I shall try a more recent version of qemu. Thank  
you so much for your help.

-----------------------------------------------------
Peter Nguyen
Jacaranda Research Group



On 02/06/2010, at 10:31 PM, mx at ...19... wrote:

> Hi Peter,
>
>
> Peter Nguyen <peter.nguyen at ...35...> hat am 2. Juni  
> 2010 um 14:18 geschrieben:
>
> > BTW, this is the output from dhcpd3.
> >
> > Wrote 2 leases to leases file.
> > Listening on LPF/tap0/de:64:1c:dc:00:f4/10.0.0/24
> > Sending on   LPF/tap0/de:64:1c:dc:00:f4/10.0.0/24
> > Sending on   Socket/fallback/fallback-net
> > DHCPDISCOVER from 52:54:00:12:34:56 via tap0
> > DHCPOFFER on 10.0.0.17 to 52:54:00:12:34:56 via tap0
> > DHCPREQUEST for 10.0.0.17 (10.0.0.1) from 52:54:00:12:34:56 via tap0
> > DHCPACK on 10.0.0.17 to 52:54:00:12:34:56 via tap0
> >
> That looks weird :)
> I've invoked a google query on 52:54:00:12:34:56, and it turned out,  
> that this is a default MAC address qemu uses when nothing else has  
> been defined.
>
> I don't really want to wander from the subject, but perhaps you  
> could try out a newer/ different qemu version since I've experienced  
> that many versions have more or less small quirks.
>
> In my setup, I used 0.11.50 which worked more or less well, git  
> should be at 0.12.something meanwhile.
>
> > Also, this is the command i used to execute the web server via qemu:
> >
> > sudo qemu -m 128 -serial stdio -no-kqemu -hda c.img -net  
> nic,model=pcnet -net
> > tap,ifname=tap0,macaddr=00:81:71:61:51:41,script=no,downscript=no
> >
> > It seems to me that the dhcp output is always the same, even if i  
> use the
> > "02-00-00-00-00-01" mac address.
> >
> > Peter
> >
> >
> > Quoting "mx at ...19..." <mx at ...19...>:
> >
> > > Hi Peter,
> > > Â
> > > I'm not sure if I've got your setup right or not.
> > > Â
> > > You have a host operating system (guess linux) with two qemu  
> instances, one
> > > running Windows XP and the other running genode with the  
> webserver.
> > > Â
> > > Your host system also runs a dhcp server which assigns the same  
> ip address to
> > > both qemu instances.
> > > Â
> > > This assignment could be caused by the fact that both qemu  
> instances have the
> > > same mac address.
> > > Â
> > > The 10.02 release notes state that the nic driver "fakes an  
> ethernet NIC with
> > > the MAC address 02-00-00-00-00-01". Where could that MAC address  
> come from?
> > > The
> > > driver obtains it from qemu in dde_tx_handler:
> > > Â
> > > dde_linux26_net_get_mac_addr(1, (unsigned char*)_mac_addr.addr);
> > > Â
> > > Â
> > > This schould be exactly that MAC address you shoud have  
> configured when
> > > starting
> > > up qemu (did you?):
> > > Â
> > > This could look like "-net  
> nic,model=pcnet,macaddr=00:81:71:61:51:41"
> > > Â
> > > Perhaps you forgot this step?
> > > Â
> > > If you haven't, it would be helpful if you provided a Wireshark  
> trace taken
> > > from
> > > your tap interface.
> > > Â
> > > Cheers
> > > Â
> > > Sven
> > > Â
> > >
> > > Peter Nguyen <petern at ...34...> hat am 2. Juni 2010 um  
> 05:04
> > > geschrieben:
> > >
> > > > Hi,
> > > >
> > > > I was just wondering in using TAP with the HTTP server (and  
> following
> > > > the instructions in the genode 10.02 documentation), i've  
> noticed that
> > > > when i have multiple connections to the server, whereby i have  
> a windows
> > > > xp virtual machine making requests to the server in addition  
> to the host
> > > > operating system (the XP vm is running in qemu as well as the  
> web
> > > > server), the IP addresses that the web server obtains are  
> always the
> > > > same regardless of the machine making the requests. Does  
> anyone know how
> > > > to provide unique IP addresses for each VM ie. is there an  
> option i
> > > > can/need to specify when i run qemu? or is there something i  
> have to do
> > > > with dhcpd3 or the conf,pid or lease files to ensure this  
> functionality.
> > > >
> > > > Thanks
> > > > Peter
> > > >
> > > >
> > >  
> ------------------------------------------------------------------------------
> > > >
> > > > _______________________________________________
> > > > Genode-main mailing list
> > > > Genode-main at lists.sourceforge.net
> > > > https://lists.sourceforge.net/lists/listinfo/genode-main
> > > Â
> > > --
> > > Sven Fülster
> >
> >
> >
> >  
> ------------------------------------------------------------------------------
> >
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> > Genode-main at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/genode-main
>
> --
> Sven Fülster
>
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