Hi Peter, I think that it would be very helpful to trace what is actually happening. Have a look at the tcpdump utility or better at wireshark which is much more convenient to use. Both tools will show the actual message flows during both dhcp handshakes, in particular you can inspect which MAC addresses the packets contain, if any of the guests suggests a distinct IP address or if any vlan tag is set as your kvm indicates. Wireshark allows for saving the packet dump in a pcap file (as well as tcpdump does, of course) which you could post here. Cheers Sven
Peter Nguyen <petern@...34...> hat am 3. Juni 2010 um 07:28 geschrieben:
Hi all,
I think i might have figured out my issue. The IP address of 10.0.0.1 corresponds to the TAP device, which suggests that the requests are coming from the TAP device (which it should be i think, unless someone can correct me). So i guess it might not actually be possible to get the starting IP address ie. the IP address of the XP VM (which is obviously not 10.0.0.1).
Peter
Peter Nguyen wrote:
Sven,
OK, so now i've got 2 different mac addresses for each of the instances. However, it seems to me that the remote ip addresses obtained by the web server are the same, regardless of the machine making the request (ie. either the XP vm or the host browser). Any idea as to why this is happening? I mean, the IP address that XP obtains is not 10.0.0.1, yet when the web server receives a HTTP request, the IP address is always 10.0.0.1.
BTW, i used this command to run my XP instance:
kvm -localtime -cdrom Microsoft\ Windows\ XP\ Professional\ (SP2).iso -m 384 -boot d windows.img
In this case, I figured that I don't need to supply a mac address for the XP vm given the web server already has a unique mac address. Furthermore, I've had difficulties in assigning a mac address to the xp vm as i keep getting the following message:
Warning: vlan 0 is not connected to host network
Thanks Peter
Quoting "mx@...19..." <mx@...19...>:
 Hi Peter,  forget what I've said about qemu :)  I invoke qemu this way:  qemu/i386-softmmu/qemu -kernel $1 -serial stdio -m 1024 -usbdevice mouse -usbdevice keyboard -net nic,model=pcnet,macaddr=00:81:71:61:51:41 -net tap,ifname=tap0,script=no,downscript=no  Note that in my commandline the macaddr param sticks to the -net nic param while in yours it sticks to the -net tap param.  Isn't this a nice candidate?  Cheers  Sven Â
Peter Nguyen <peter.nguyen@...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
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@...19..." <mx@...19...>:
Hi Peter,  I'm not sure if I've got your setup right or not.  You have a host operating system (guess linux) with two qemu instances,
one
running Windows XP and the other running genode with the webserver.  Your host system also runs a dhcp server which assigns the same ip
address
to both qemu instances.  This assignment could be caused by the fact that both qemu instances have the same mac address.  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:  dde_linux26_net_get_mac_addr(1, (unsigned char*)_mac_addr.addr);   This schould be exactly that MAC address you shoud have configured when starting up qemu (did you?):  This could look like "-net nic,model=pcnet,macaddr=00:81:71:61:51:41"  Perhaps you forgot this step?  If you haven't, it would be helpful if you provided a Wireshark trace
taken
from your tap interface.  Cheers  Sven ÂÂ
Peter Nguyen <petern@...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@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
ÂÂ
Sven Fülster
Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
  -- Sven Fülster
 Â
Peter Nguyen <peter.nguyen@...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
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@...19..." <mx@...19...>:
Hi Peter,  I'm not sure if I've got your setup right or not.  You have a host operating system (guess linux) with two qemu instances,
one
running Windows XP and the other running genode with the webserver.  Your host system also runs a dhcp server which assigns the same ip
address
to both qemu instances.  This assignment could be caused by the fact that both qemu instances have the same mac address.  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:  dde_linux26_net_get_mac_addr(1, (unsigned char*)_mac_addr.addr);   This schould be exactly that MAC address you shoud have configured when starting up qemu (did you?):  This could look like "-net nic,model=pcnet,macaddr=00:81:71:61:51:41"  Perhaps you forgot this step?  If you haven't, it would be helpful if you provided a Wireshark trace
taken
from your tap interface.  Cheers  Sven ÂÂ
Peter Nguyen <petern@...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@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
ÂÂ
Sven Fülster
Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
  -- Sven Fülster xms@...38...
--
Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
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