Re: [Xen-users] Re: [Xen-devel] xen 4.1.2* dhcp issue/bug when installing/booting HVM domU domains (CentOS 6, unbuntu 11.04 server). Debian/OpenSolaris work fine.

[Mark Schneider <ms@xxxxxxxxxxxxxxxxxxxxxx>]

Am 15.08.2011 23:48, schrieb Pasi Kärkkäinen:
> On Mon, Aug 15, 2011 at 11:12:26PM +0200, Mark Schneider wrote:
>    
> >     Tested and *nonworking* working OSes (no IP address):
> >     - CentOS 6.0
> >
> >
> >     Pings from *centos-hvm* to dom0 interface*no ip-traffic on peth0*
> >      
> This is just like it should be. When you ping dom0 packets obviously should not 
> go out.
>
>    
> >     root@xen411dom0:/ftp/HVM# tcpdump  -i eth0 'icmp[icmptype] = icmp-echo and
> >     icmp[icmptype] != icmp-echoreply'
> >     tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> >     listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
> >     19:45:30.283679 IP 192.168.1.180>  192.168.1.124: ICMP echo request, id
> >     61445, seq 23, length 64
> >     19:45:31.285560 IP 192.168.1.180>  192.168.1.124: ICMP echo request, id
> >     61445, seq 24, length 64
> >
> >      
> And here on the bridge you see traffic, so that's ok.
>
>
>    
> >     Pings from *centos-hvm* to default gateway *no ip-traffic on peth0*
> >
> >      
> So here's your problem. Your bridge in dom0 is NOT forwarding the packets out 
> to peth0..
>
>
>    
> >     root@xen411dom0:/ftp/HVM# tcpdump  -i eth0 'icmp[icmptype] = icmp-echo and
> >     icmp[icmptype] != icmp-echoreply'
> >     tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> >     listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
> >     19:54:00.770442 IP 192.168.1.180>  192.168.1.1: ICMP echo request, id 518,
> >     seq 23, length 64
> >     19:54:01.770958 IP 192.168.1.180>  192.168.1.1: ICMP echo request, id 518,
> >     seq 24, length 64
> >      
> So where are these packets going to ? They're not getting out of dom0..
>
> Do you have a firewall rule in dom0 that drops them?
>
> Try these:
> - In the HVM guest: run "arp -an" and check what MAC address you see for the 
> gateway-IP.
> - In dom0: run "brctl showmacs eth0" and verify which port has the MAC of the 
> gateway.
>    
[root@centoshvm ~]# arp -an
? (192.168.1.102) auf 00:1c:25:7e:fb:b7 [ether] auf eth0
? (192.168.1.124) auf b4:99:ba:c1:27:36 [ether] auf eth0


root@xen411dom0:~# brctl showmacs eth0
port no mac addr                is local?       ageing timer
  6     00:16:3e:27:17:67       no                 3.22
  3     00:16:3e:27:20:67       no                40.85
  1     00:1c:25:7e:fb:b7       no                 0.00
  1     00:1d:7e:ad:35:a8       no                12.66
  1     b4:99:ba:c1:27:36       yes                0.00
  2     fe:ff:ff:ff:ff:ff       yes                0.00
root@xen411dom0:~# arp -an
? (192.168.1.102) auf 00:1c:25:7e:fb:b7 [ether] auf eth0
? (192.168.1.180) auf 00:16:3e:27:17:67 [ether] auf eth0
? (192.168.1.1) auf 00:1d:7e:ad:35:a8 [ether] auf eth0

Thank you, Mark

--
ms@xxxxxxxxxxxxxxxxxxxxxx
http://www.it-infrastrukturen.org



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