Re: [Xen-users] Xen in a routed network environment?

[Andy Smith <andy@xxxxxxxxxxxxxx>]

On Wed, Jan 25, 2006 at 01:25:25AM +0100, Ralph Passgang wrote:
> Am Dienstag, 24. Januar 2006 22:13 schrieb Andy Smith:
> > Hello,
> >
> > I'm used to using Xen in a bridge mode where my dom0 and all domUs
> > are on the same layer 2 network.  However now I have to set up a
> > server whose eth0 is on one network and the domUs will be on another
> > /29.
> >
> > So, for example, if the eth0 of dom0 is 192.168.1.214/24, then I
> > have 10.1.1.0/29 (10.1.1.0 -> 10.1.1.7) routed to it for use in
> > domUs, how would I go about setting that up?
> 
> As you would configure it for every normal/physical server. Your router has 
> to 
> route traffic for this /29 to the same network interface as for the /24 you 
> are already using right now. xen (in bridge mode) is just like having more 
> then one realserver connected to one of your switchports (by using an 
> additional switch/hub or whatever). I would suggest that you bind one ip out 
> of the /29 on the router, and one other ip out of the /29 on your domU. The 
> domU now only has to be configured to use the ip and the correct netmask + 
> your router's ip (the one from the new /29 net) as default gateway. It 
> doesn't need to know about your already existing /24 network, that there is a 
> bridge between the domU and the router or something else.

Hi Ralph, thanks for your reply.

The above is what I thought but I can't seem to get it to work.
Here's what I have in dom0 immediately after booting with xend
started and one domU running:

$ ip -4 addr
1: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    inet 217.147.82.214/24 brd 217.147.82.255 scope global eth0
    inet 217.147.93.65/29 brd 217.147.93.255 scope global eth0:1
2: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    inet 127.0.0.1/8 scope host lo
4: veth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop
    inet 217.147.82.214/24 brd 217.147.82.255 scope global veth0
$ brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              vif1.0
$ ip ro
217.147.93.64/29 dev eth0  proto kernel  scope link  src 217.147.93.65
217.147.82.0/24 dev eth0  proto kernel  scope link  src 217.147.82.214
default via 217.147.82.1 dev eth0
$ cat /proc/sys/net/ipv4/ip_forward
1

Externally pinging 217.147.93.65 (the IP alias in dom0) works fine.
Pinging 217.147.93.66 (the domU IP) gets me this:

$ ping 217.147.93.66
PING 217.147.93.66 (217.147.93.66) 56(84) bytes of data.
From 217.147.82.214 icmp_seq=2 Destination Host Unreachable
From 217.147.82.214 icmp_seq=3 Destination Host Unreachable
From 217.147.82.214 icmp_seq=4 Destination Host Unreachable

--- 217.147.93.66 ping statistics ---
5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4021ms
, pipe 3

The domU of course has no connectivity at all, but its settings are:

# ip -4 addr
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    inet 217.147.93.66/29 brd 217.147.93.255 scope global eth0
# ip ro
217.147.93.64/29 dev eth0  proto kernel  scope link  src 217.147.93.66
default via 217.147.93.65 dev eth0

What am I missing?

Thanks,
Andy

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