Re: [Xen-users] Virtual network disconnect?

[Hardy <hardy@xxxxxxxxxxxxxxxx>]

Hi Dirk :)

> a) in which direction does the download go (from domU to net, from net 
to domU, from dom0 to net, ....)?
From domU to net. A service (here: webserver) offers files to download 
(like a fileserver). If a user (like me at home) downloads the file the 
breakdown happens.
> b) did you setup iptables manually or do you use something like 
shorewall for that?
I set up them manually within a script like that:
$ipt -t nat -A PREROUTING -d $external_ip -p tcp --dport 80 -j DNAT --to 
192.168.1.5
(packet-forwarding enabled)

> c) what exactly is script-nat?
I think XEN3's nat is like the network in XEN2. New to XEN3 is bridging and 
routing, but i don't use them.
every domU has a vifx.y in dom0's address space and its own IP, but there 
is automatically routing/natting between them.
> d) did you test if connection is reopened after some time (5 minutes, 
one hour, etc.)?
No, I didn't. How to do that? Why should the connection reopens itself in a 
natted net?
Thx for answering,
Hardy

At 08:58 19.04.2006, Dirk H. Schulz wrote:
> Hi Hardy,
>
> Hardy Wolf schrieb:
>
> > Hi,
> >
> > I have a XEN 3.0.1 - Debian Sarge (Rootserver). There is a dom0 with 
> > connection to the internet (WAN-IP) and a domU with a local IP 
> > (192.168.x.y). The network is forwarded with iptables and script-nat.
> > All works fine until someone downloads a big file (last test ~100 MB). 
> > Suddenly the connection is lost. By checking all circumstances I noticed 
> > that XEN is no longer able to send packets to the domU. The connection 
> > from virtual to the real network is broken.
> > How can I fix that?
> > Does anybody know that problem?
> >
> > In XEN 2.0.7 I had that problem, too.
> I think I have a similar setup with Xen 2.0.7, but not the same problem.
>
> Just to make things clear:
> a) in which direction does the download go (from domU to net, from net to 
> domU, from dom0 to net, ....)?
> b) did you setup iptables manually or do you use something like shorewall 
> for that?
> c) what exactly is script-nat?
> d) did you test if connection is reopened after some time (5 minutes, one 
> hour, etc.)?
> Dirk

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