[Xen-devel] Setting up virtual network

[Rick <judicator3@xxxxxxxxx>]

Hello,

I have installed xen2.0 on my fedora core 3 machine.
I am having some trouble to set up the virtual network between the
different  domains. The truth is I do not know much about the setup of
virtual ethernet bridge and how to route stuff inside. From what I
undestand, the bridge connects all interfaces (eth0, vif1.0 etc... )
together. If someone could point me to some material that would be
great. This is what I have done so far:

I can start xen and domain0 comes up correctly. From domain0 I can
have access to internet. Next I start the ttylinux with the following
configuration:

===================================================
kernel = "/boot/vmlinuz-2.6.10-xenU"
memory = 64
nics=1
ip = "10.0.0.2"
disk = [ 'file:/Xen/TtyLinux/ttylinux-xen,sda1,w' ]
root = "/dev/sda1 ro"
===================================================

After ttylinux comes up, my network looks like this:

===================================================
ifconfig on domain0

eth0      Link encap:Ethernet  HWaddr 00:0E:A6:6B:70:CC
          inet addr:128.100.241.161  Bcast:128.100.241.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2209 errors:174 dropped:0 overruns:0 frame:0
          TX packets:44 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:166158 (162.2 KiB)  TX bytes:4326 (4.2 KiB)
          Interrupt:22 Memory:feafc000-0

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:847 errors:0 dropped:0 overruns:0 frame:0
          TX packets:847 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:54901 (53.6 KiB)  TX bytes:54901 (53.6 KiB)

vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:236 errors:0 dropped:47 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:15084 (14.7 KiB)

xen-br0   Link encap:Ethernet  HWaddr 00:0E:A6:6B:70:CC
          inet addr:128.100.241.161  Bcast:128.100.241.255 
Mask:255.255.255.255          UP BROADCAST RUNNING MULTICAST  MTU:1500
 Metric:1
          RX packets:1238 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:65724 (64.1 KiB)  TX bytes:1364 (1.3 KiB)
===================================================

===================================================
ifconfig on ttylinux

eth0      Link encap:Ethernet  HWaddr AA:00:00:41:24:DF
          inet addr:10.0.0.2  Bcast:10.255.255.255  Mask:255.0.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
====================================================


I want to communicate between ttylinux and domain0
So I try to assign an IP to vif1.0 on domain0 "ifconfig vif1.0 10.0.0.1"
Next I try to "ping 10.0.0.2" from domain0 and "ping 10.0.0.1" from ttylinux.
But of course that does not work :). I am pretty new to those things, if someone
can point me what to work on, that would be great.
To make ttylinux to access internet, do I have to set domain0 as a NAT router ?

Also, another issue that may or may not be related. When I boot into 
xen2.0/domain0, my iptable is not loaded properly:

==================================================
[root@aquarius ~]# /etc/init.d/iptables start
Applying iptables firewall rules: iptables-restore v1.2.11: iptables-restore: 
unable to initializetable 'filter'

Error occurred at line: 3
Try `iptables-restore -h' or 'iptables-restore --help' for more information.
                                                           [FAILED]
==================================================

I have just installed xen2.0 on a fresh fedora core 3 installation and my
iptables rules are those that were created by fedora core 3 installation:

==================================================
# Firewall configuration written by system-config-securitylevel
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT
===================================================

Is that iptable error important to get my virtual network to run correctly ?
Should I add additional modules in my .config file to compile iptables module in
the vmlinuz-2.6.10-xen0 kernel ?

Thanks
Rick


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