Xen users - Jan 2006 - XEN and DSL (pppd)

Hello all,

I have a problem using XEN on my internet routing box.
The situation on this box is as follows:
- I use pppd with pppoe for DSL connection
- I have some iptables rules
- I use proxy arp
- I installed XEN (xen-3.0-testing.hg) on it
- I use routing (..-route scripts) in XEN

Aim was to separate the IP traffic for each domU and create the 
possibility of filtering, traffic shaping etc. in dom0. Therefore my 
idea was to use proxy arp in combination with point to point routing.

And this is what happens using XEN on my box:
- I boot the machine (DSL is working perfect as ever)
- I start xend (DSL still works)
- I start a domU (it sets up an vifx.0 device) (DSL doesn''t work
anymore)
- When I now try to ping from dom0 to an outside IP it doesn''t work.
- I can ping to any IP on my 192.168.0.x network from dom0 and domU, but 
not to outside IPs
- changes are only a new route for the domU in dom0 (seem to be ok for me)
 (I modified the vif-route script to not setup any iptables rules.)

Tracking packets with tcptump revealed that the pings are seen on the 
corresponding network interfaces (in case of domU: vifx.0), but not on 
the ppp0 interface to the internet via DSL. The complete setup works 
fine for my old non-XEN setup.

I''m not an expert in routing stuff, but I do not know why I
can''t reach
the outside world anymore if I start a domU.

Has anyone observed this before?
Any ideas?


greetings Boris

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On Monday 16 January 2006 20:29, Boris Kröger wrote:
> And this is what happens using XEN on my box:
> - I boot the machine (DSL is working perfect as ever)
> - I start xend (DSL still works)
> - I start a domU (it sets up an vifx.0 device) (DSL doesn''t work
anymore)
starting of the first domU triggers the network-startup scripts xen installed, 
those rename your eth0 device to peth0, and create a new "virtual"
eth0.

I see two possible things you could try:

(re)start ppp after domU startup (also try to configure it to work on device 
peth0 then)

or

setup the bridge "by hand" (or with your distributions
brctl/networking
scripts), have xen use the existing bridge.

Hope one of those works,
/Ernst 

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