[Xen-users] ARP requests from domU not answered on network

[Stephan Schwab <sns@xxxxxxxxxxx>]

Hi!

This is getting a bit strange. I have a working Xen setup on Ubuntu.  
dom0 is 2.6.12.6-xen0 and domU is 2.6.12.6-xenU. But I have problems  
reaching any target outside the Xen host.
The DHCP server is on the network and external to the Xen host. The  
IP addresses used are:
dom0: 192.168.1.200
domU: 192.168.1.121 obtained via DHCP

I can ping back and forth between .200 (dom0) and .121 (domU) and can  
see the traffic via tcpdump on xenbr0.
When I ping another host on the network I see this on the bridge:

23:38:37.431863 arp who-has 192.168.1.101 tell 192.168.1.121

and in domU:

From 192.168.1.121 icmp_seq=1 Destination Host Unreachable

ifconfig on dom0 shows:

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:20628 errors:0 dropped:0 overruns:0 frame:0
          TX packets:41155 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1949792 (1.8 MiB)  TX bytes:9541427 (9.0 MiB)
          Interrupt:18 Base address:0x1400

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:54 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3872 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2268 (2.2 KiB)  TX bytes:624258 (609.6 KiB)

vif3.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:450 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3071 errors:0 dropped:298 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:21628 (21.1 KiB)  TX bytes:482186 (470.8 KiB)

xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet addr:192.168.1.200  Bcast:192.168.1.255  Mask: 
255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:17726 errors:0 dropped:0 overruns:0 frame:0
          TX packets:37781 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1393935 (1.3 MiB)  TX bytes:9203473 (8.7 MiB)

ifconfig in domU:

eth0      Link encap:Ethernet  HWaddr 00:16:3E:5F:9E:40
          inet addr:192.168.1.121  Bcast:192.168.1.255  Mask: 
255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3204 errors:0 dropped:0 overruns:0 frame:0
          TX packets:412 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:493011 (481.4 KiB)  TX bytes:20032 (19.5 KiB)

Anyone has any idea where to look for the reason of this behavior?

Stephan


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