Re: Networkconfiguration with KVM

[Dan Johansson <kvm@dmj.nu>]

On Monday 05 April 2010 19.48:49 Bernhard Held wrote:
> Am 05.04.2010 17:31, schrieb Held Bernhard:
> > Hi Dan!
> >
> >> But Still I get the following:
> >> From the Host to the VM:
> >> $ ssh root@192.168.4.4
> >> ssh: connect to host 192.168.4.4 port 22: Connection refused
> >>
> >> And from the VM to the Host:
> >> # ssh root@192.168.4.1
> >> ssh: connect to host 192.168.4.1 port 22: Connection refused
> >>
> >> Any more suggestions?
> >
> > qtap1 and eth1 on the guest show rx- and tx-packets, this looks not that
> > bad.
> >
> > "Connection refused" smells like a closed or firewalled port
> > (hosts.allow / hosts.deny?). If there's no network at all (and no arp
> > resolution) ssh would print "no route to host".
> >
> > Please make sure that you remove all rules from iptables on both the
> > host and the guest. Then start pinging:
> > host -> host
> > host -> guest
> > guest -> guest
> > guest -> host
> >
> > If I have to debug network problems I always run `tcpdump`. This way I
> > can quickly isolate the problem (`tcpdump -i eth1`, `tcpdump -i qtap1`).
> >
> > Regards,
> > Bernhard
> 
> Just another idea: did you enable routing?
> 
> echo 1 > /proc/sys/net/ipv4/ip_forward
Hi Bernhard,

That was already done. As per my last mail the host<-->guest communication now 
works. What I am now trying to get to run is the communication between the VM 
and a network where the host-server has "no access" (i.e. no IP).

This should be done over the host-eth3 interface and I have set up the br-eth3 
and qtap3 the same way as with the eth1/br-eth1/qtap1 with one difference - 
the br-eth3 interface is setup without an IP.
When doing traffic from the VM to the network I can see traffic on the qtap3 
and br-eth3 interface but none on the eth3.

Must I specify an IP for the br-eth3 interface?

Regards,
-- 
Dan Johansson, <http://www.dmj.nu>
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