Re: [Xen-users] Xen4.4 HVM domains and routed setups

["Steffen Heil (Mailinglisten)" <lists@xxxxxxxxxxxxxxx>]

Hi


I tried a lot of things, and I found something differences, that enabled me to 
make the system WORK:

--- old system 
--------------------------------------------------------------------------------

The old system creates 2 devices for each hvm domain:
vif32.0 and vm-test
The vm-test device is a tap device:

# ip tuntap show
vm-test: tap

# ip a
...
50: vif32.0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 32
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
51: vm-test: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state 
UNKNOWN qlen 500
    link/ether 1e:1e:bf:79:39:0d brd ff:ff:ff:ff:ff:ff
    inet 1.1.1.1/32 brd 1.255.255.255 scope global vm-test

# ifconfig vif32.0
vif32.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

# ifconfig vm-test
vm-test Link encap:Ethernet  HWaddr 1e:1e:bf:79:39:0d
          inet addr:1.1.1.1  Bcast:1.255.255.255  Mask:255.255.255.255
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:159023 errors:0 dropped:0 overruns:0 frame:0
          TX packets:184838 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:28804291 (28.8 MB)  TX bytes:70720586 (70.7 MB)

--- new system 
--------------------------------------------------------------------------------

And the new system also creates 2 devices:
  vm-test and vm-test-emu
Here vm-test-emu is the tap device:

# ip tuntap show
vm-test-emu: tap one_queue vnet_hdr

# ip a
...
31: vm-test-emu: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group 
default qlen 500
    link/ether 92:8f:40:6e:a1:10 brd ff:ff:ff:ff:ff:ff
32: vm-test: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast 
state DOWN group default qlen 32
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
    inet 1.1.1.1/32 brd 1.255.255.255 scope global vm-test
       valid_lft forever preferred_lft forever

# ifconfig vm-test-emu
vm-test-emu Link encap:Ethernet  HWaddr 92:8f:40:6e:a1:10
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:157 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:7090 (7.0 KB)  TX bytes:0 (0.0 B)

# ifconfig vm-test
vm-test Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet addr: 1.1.1.1  Bcast:1.255.255.255  Mask:255.255.255.255
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

-----------------------------------------------------------------------------------

So, the devices seem to be somewhat swapped and on the new system both devices 
seem to be down.
I can see arp requests from the VM if I manually bring the vm-test-emu device 
online. But the host does not answer.

So I can run the following command to get it working:

echo 1 >  /proc/sys/net/ipv4/conf/vm-test-emu/proxy_arp
ip llink set vm-test-emu up
ip route del 1.1.2.5 dev vm-test src 1.1.1.1
ip route add 1.1.2.5 dev vm-test-emu src 1.1.1.1

THEN IT WORKS.

However I would not like to run all these commands everytime I boot the system 
but rather fix the vif-route scripts.
I would also want to contribute the results, as I am quite sure, the existing 
scripts cannot work for anyone...

But I am not show how I would fix that....


Anyone any ideas?


Regards,
  Steffen

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