[Xen-users] Re: domU networking problems: network interface does

I have been unable to make progress on this issue. Does anyone have suggestions as to how I might debug my networking issues between DomU and Dom0?

j.

On Sun, Jul 5, 2009 at 10:29 PM, Joseph King <joking@xxxxxxx> wrote:

I've got a partial answer to my question. It appears that some packet support was missing so I added it by loading the 'af_packet' module into the initrd as described in this bug:

The result is that on boot ifconfig reports a proper IP address whether it was acquire via DHCP or was statically assigned:

[root@template ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:22:22:24:6D:FB

   inet addr:192.168.1.123 Bcast:192.168.1.255 Mask:255.255.255.0
   inet6 addr: fe80::222:22ff:fe24:6dfb/64 Scope:Link
   UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

   RX packets:83 errors:0 dropped:0 overruns:0 frame:0
   TX packets:41 errors:0 dropped:0 overruns:0 carrier:0
   collisions:0 txqueuelen:1000
   RX bytes:10920 (10.6 KiB) TX bytes:3394 (3.3 KiB)

Sadly, trying to ping that gateway produces:

[root@template ~]# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.

--- 192.168.1.1 ping statistics ---

214 packets transmitted, 0 received, 100% packet loss, time 213022ms

Which means that although arp can help me to find an IP now my IP packets are not getting back to the gateway.

Any thoughts on how to fix or debug this?

j.

On Sun, Jul 5, 2009 at 8:53 AM, Joseph King <joking@xxxxxxx> wrote:

I recently ported one of my domU images running on FC6 dom0 to OpenSuse 10.3 dom0. The domU image is FC6 image which I start up using the following xen config file in OpenSuse 10.3:

kernel = "/boot/vmlinuz-2.6.22.19-0.2-xen"

ramdisk = "/boot/initrd-2.6.22.19-0.2-xen-fc6"
memory = "256"
name = "itfordev"
vif = ['vifname=itfordev, bridge=xenbr1, mac=00:22:22:24:6D:FB']

#dhcp = "dhcp"
disk = ['file:/var/lib/xen/images/templates/itfordev-fc6/itfordev-fc6-disk.img,sda1,w',
   'file:/var/lib/xen/images/templates/itfordev-fc6/itfordev-fc6-swap.img,sda2,w', ]

root = "/dev/sda1 ro"
extra = 'xencons=tty'

The image appears to boot correctly except for IP networking. On starting the network services the following messages are received:

[root@template etc]# service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
SIOCGIFFLAGS: No such device

Bringing up loopback interface: arping: socket: Address family not supported by protocol
[ OK ]
Bringing up interface eth0:
Determining IP information for eth0... failed.
[FAILED]

ifconfig reports the eth0 interface is up, without IP info:

[root@template network-scripts]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:22:22:24:6D:FB

   inet6 addr: fe80::222:22ff:fe24:6dfb/64 Scope:Link
   UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
   RX packets:38 errors:0 dropped:0 overruns:0 frame:0
   TX packets:6 errors:0 dropped:0 overruns:0 carrier:0

   collisions:0 txqueuelen:1000
   RX bytes:2280 (2.2 KiB) TX bytes:468 (468.0 b)

lo Link encap:Local Loopback
   inet addr:127.0.0.1 Mask:255.0.0.0

   inet6 addr: ::1/128 Scope:Host
   UP LOOPBACK RUNNING MTU:16436 Metric:1
   RX packets:177 errors:0 dropped:0 overruns:0 frame:0
   TX packets:177 errors:0 dropped:0 overruns:0 carrier:0

   collisions:0 txqueuelen:0
   RX bytes:31799 (31.0 KiB) TX bytes:31799 (31.0 KiB)

My eth0 config file is as follows:

# Xen Virtual Ethernet
BOOTPROTO=dhcp
DEVICE=eth0
#IPADDR=192.168.1.123
#NETMASK=255.255.255.0
#GATEWAY=192.168.1.1
#GATEWAYDEV=eth0
HWADDR=00:22:22:24:6D:FB

>

Looking for arp entries produces the following:

[root@template network-scripts]# arp -a
[root@template network-scripts]#

Curiously if I tell ifconfig to assign an IP address to the interface I can get ip networking to work:

[root@template network-scripts]# ifconfig eth0 192.168.1.153
[root@template network-scripts]# ifconfig

eth0 Link encap:Ethernet HWaddr 00:22:22:24:6D:FB
   inet addr:192.168.1.153 Bcast:192.168.1.255 Mask:255.255.255.0
   inet6 addr: fe80::222:22ff:fe24:6dfb/64 Scope:Link

   UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
   RX packets:81 errors:0 dropped:0 overruns:0 frame:0
   TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
   collisions:0 txqueuelen:1000
   RX bytes:4860 (4.7 KiB) TX bytes:510 (510.0 b)

lo Link encap:Local Loopback
   inet addr:127.0.0.1 Mask:255.0.0.0

   inet6 addr: ::1/128 Scope:Host
   UP LOOPBACK RUNNING MTU:16436 Metric:1
   RX packets:177 errors:0 dropped:0 overruns:0 frame:0
   TX packets:177 errors:0 dropped:0 overruns:0 carrier:0

   collisions:0 txqueuelen:0
   RX bytes:31799 (31.0 KiB) TX bytes:31799 (31.0 KiB)

[root@template network-scripts]# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.

64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.61 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.715 ms

64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.692 ms

--- 192.168.1.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.692/1.008/1.619/0.433 ms

The results are the same regardless of whether I assign a static IP or use DHCP on boot. Any ideas how I can get the networking scripts to bond to the dom0 interface on boot?

j.

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