Re: Networkconfiguration with KVM

[Dan Johansson <kvm@dmj.nu>]

On Monday 05 April 2010 17.31:22 Held Bernhard wrote:
> 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`).
First of all - I appreciate you help!

Here are the results of my tests:
host->host:	No traffic on eth1, qtap1 or br-eth1
host->guest:	No traffic on eth1, qtap1 or br-eth1
guest->guest:	No traffic on eth1, qtap1 or br-eth1
guest->host:	No traffic on eth1, ECHO-request & Host unreachable on qtap1 and 
br-eth1

18:05:22.597808 IP 192.168.4.4 > 192.168.4.1: ICMP echo request, id 47120, seq 
1, length 64
18:05:22.597935 IP 192.168.4.1 > 192.168.4.4: ICMP host 192.168.4.1 
unreachable, length 92

Thanks to you and this information I reviewed my iptables (again) and found an 
old entry for the 192.168.4.0/24 subnet on the Host hidden within a startup-
script. I was probably using that subnet for some other tests some years ago 
and did not clean out everything afterwards.

Now I just have to get the other interfaces in the VM working (and putting it 
all in some startup-script).

Once again thanks for your help!!!

Regards,
-- 
Dan Johansson, <http://www.dmj.nu>
***************************************************
This message is printed on 100% recycled electrons!
***************************************************