I am trying to configure properly a small network of XEN 3.0.3 domains,
using NAT, in order
to keep it a private subnet. This is connecting them all to the same
virtual network (10.0.0.X) and dom0 acting
as a router to the company net which connects to the internet.
In order to do this:
- the host machine belongs to a company network and has 1 ethernet card,
a static IP, gateway and DNS server.
- the domUs are Debian Sarge, compiled from source.
I configured:
1. xend-config
(network-script network-nat)
(vif-script vif-nat)
2. First domU config:
name="vm5"
kernel="/boot/vmlinuz-2.6-xenU"
root="/dev/hda1"
memory=512
disk=['file:/boot/VM/vm5disk,hda1,w','file:/boot/VM/vm5swap,hda2,w']
vif=[ 'mac=A1:A1:A1:A1:A1:A1, vifname=vif_vm5, bridge=xenbr0' ]
dhcp="off"
ip="10.0.0.1"
netmask="255.0.0.0"
gateway="10.0.0.254"
hostname="vm5"
extra="3"
After boot, the above VM has a virtual eth0 adapter :
eth0 Link encap:Ethernet HWaddr A1:A1:A1:A1:A1:A1
inet addr:10.0.0.1 Bcast:10.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::a3a1:a1ff:fea1:a1a1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:440 (440.0 b)
but that does not ping dom0 nor any other domU:
$ ping <host machine>
connect: Network is unreachable
I understood from a Debian setup guide
http://howtoforge.com/debian_sarge_xen_3.0.3_p5
that XEN configures the gateway and much other things itself.
Therefore, I have a few questions to XEN experts:
1- what is made automatically by XEN in such a case?
- what are the values of the domU gateways ?
- where is the router between my domains (ie its IP and config)?
- what interfaces are created and configured by XEN?
Indeed, I have some virtual network interfaces appearing, namely
veth0 Lien encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:0 (0.0 b) Octets transmis:0 (0.0 b)
veth1 Lien encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:0 (0.0 b) Octets transmis:0 (0.0 b)
vif_vm5 Lien encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet adr:10.0.1.128 Bcast:0.0.0.0 Masque:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:7 erreurs:0 :0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:412 (412.0 b) Octets transmis:0 (0.0 b)
but who do not seem to function (according to xm top)
- Do I have to setup some routes? The dom0 routing table is actually :
Destination Passerelle Genmask Indic Metric Ref Use
Iface
10.0.1.1 * 255.255.255.255 UH 0 0 0
vif_vm5
localnet * 255.255.252.0 U 0 0 0 eth0
default sirtaki 0.0.0.0 UG 0 0 0 eth0
and the domU routing table is:
Destination Gateway Genmask Flags Metric Ref Use
Iface
10.0.0.0 * 255.0.0.0 U 0 0 0 eth0
2- Why don't the domUs recognise any manual config (in /etc{hosts,
network/interfaces})?
thanks for any help.
Armand
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