[Xen-users] Re: Routing problem

["Janke Dávid" <janke.david@xxxxxxxxx>]

Additional info:
Within testhosts I can NOT ping their own interfaces. So no reply from 10.12.1.2 within testhost1

On 9/13/06, Janke Dávid <janke.david@xxxxxxxxx> wrote:

Hi all!

I'm trying for a few days now and I don't get it so I need help.
I'm trying to set up several test systems as domUs. We've got a 10.0.0.0/8 Intranet, the ethernet interface in dom0 is 10.2.0.9 and the test servers would be 10.12.1.2/29 (testhost1), 10.12.1.3/29 (testhost2), 10.12.2.2/24 (testhost3), 10.12.2.3/24 (testhost4).

I guess routing via dom0 would be appropriate.

I've also read this: http://www.debian-administration.org/articles/360
According to this I have to create dummy ethernet drivers in dom0 and then create a bridge to connect interfaces on one LAN to it.

Here's the layout in ASCII:
           +-----------------------------------------------+
           | physical machine, dom0                        |
           |                                   +---------+ |
Intranet -----eth0                         +---|testhost1| |
           |                               |   +---------+ |
           |         dummy0 --- xenbridge0 +               |
           |                               |   +---------+ |
           |                               +---|testhost2| |
           |                                   +---------+ |
           |                                   +---------+ |
           |                               +---|testhost3| |
           |                               |   +---------+ |
           |         dummy1 --- xenbridge1 +               |
           |                               |   +---------+ |
           |                               +---|testhost4| |
           |                                   +---------+ |
           +-----------------------------------------------+

xend-config.xsp contains:
(network-script network-route)
(vif-script vif-route)

The config file of a host looks like:
-----------------------------------------
name = "testhost1"
kernel = "/boot/vmlinuz-2.6-xen"
ramdisk = "/boot/initrd.img-2.6.16-xen"
memory = 256
disk = ['phy:/dev/mapper/vg0-testhost1root,sda1,w','phy:/dev/mapper/vg0-testhost1swap,sda2,w']
root = "/dev/sda1"
# network config
vif = [ 'ip= 10.12.1.2 ' ]
dhcp = "off"
hostname = "testhost1"
-----------------------------------------

Here are the problems.
#1:
When starting a teshost, xend creates vif<x>.0 and assigns 10.2.0.9 as IP!!!! Not 10.12.whatever

#2:
I know I have to assign vif<x>.0 to xenbridge manually (will do that later in vif-route). But for testing reasons I do this per hand. 'brctl show' says:
xenbridge0              8000.66c7fb672b7e       no              dummy0
                                                        vif36.0
                                                        vif37.0

'route' says:
10.12.1.0       *               255.255.255.0   U     0      0        0 vif37.0
10.12.1.0       *               255.255.255.0    U     0      0        0 vif36.0
localnet        *               255.0.0.0       U     0      0        0 eth0
default         gw.localnet 0.0.0.0         UG    0      0        0 eth0

dummy0 is: 10.12.1.1/24

default gw on teshosts is set 10.12.1.1

And I can NOT ping 10.12.1.3 from 10.12.1.2 or the other way. Nor can I ping 10.12.1.1 or 10.2.0.9. What i CAN is pinging 10.12.1.2 and 10.12.1.3 from dom0

I know, I doing something wrong but I can't figure it out.

David

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