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xen-users
Re: [Xen-users] Virtual network disconnect?
Hi Hardy,
Hardy schrieb:
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.
There is bridging and routing with Xen 2.x as well. I use it a lot.
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?
Just to make sure you did not set up intrusion detection (e. g. snort
inline) which cuts down on network connections if traffic reaches a
threshold limit. Something like that.
I think it cannot be a problem of your general networking concept since
it works with smaller downloads. So there is either a problem with your
kernel or a feature you do not remember setting up. :-)
Have you tested the same with a different protocol (let's say ftp or
sftp or smb ...) so make sure the problem is not on the application layer?
Dirk
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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