[Xen-users] routing problem

["Alexey Koptsevich" <akopts@xxxxxxxxx>]

Hello,

I have a server running Xen 3.0.2. It has 3 ethernet cards: eth0 is
behind a DSL
router in network 192.168.1, eth1 is connected to LAN 192.168.5, eth2
is used for
something else, unrelated to my question. DomUs host virtual servers on
192.168.4, and I want to make dom0 a firewall for virtual servers and
for internal
network. I am trying to use routing setup of Xen but cannot make it work.

The configuration for test domU is

kernel  = "/boot/vmlinuz-2.6.16-xen"
memory  = 256
name    = "tst"
disk    = [ 'phy:sda5,hda1,w', 'phy:sda6,hda2,w' ]
vif     = [ 'ip=192.168.4.200,mac=00:16:3e:00:00:01' ]
netmask = "255.255.255.0"
dhcp    = "off"
hostname = "tst"
root    = "/dev/hda1 ro"
extra   = "4"

Whether I configure networking for domU in /etc/network/interfaces or
not, domU is brought up with eth0 down (but routing to its IP gets added to
dom0's routing table). If I manually configure domU's network by

ifconfig eth0 inet 192.168.4.200 netmask 255.255.255.0
route add default dev eth0

I am able to ping domU (192.168.4.200) from dom0 (192,168.1.111)
and vice versa, but I cannot ping anything outside the server from domU.
Am I missing something obvious in routing setup?

Is there a way to configure domU's networking via configs?
Standard way does not seem to work. I do not mind to put the above
commands to rc.local, but is there better way?

The system is running Ubuntu 6.06 LTS with kernel 2.6.16 installed from
Dapper packages. Both /proc/sys/net/ipv4/conf/eth0/proxy_arp and
/proc/sys/net/ipv4/ip_forward are set to 1.

Thanks a lot,
Alex

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