[Users] received packet with own address as source address

[Assaf Muller]

Hello Mr. Liu,

Sounds like a classic L2 loop. Hosts getting their own packets then losing connectivity for a few minutes while the switches restart.

Can you try to rule out this possibility?
For example:
  If you uninstall the engine and VDSM from all hosts does this still happen?
  Can you simplify the network topology and see if the issue persists?


----- Original Message -----
From: "H. Haven Liu" <haven.liu at ucla.edu>
To: Users at ovirt.org
Sent: Saturday, August 17, 2013 10:06:07 PM
Subject: [Users] received packet with own address as source address

Hello,

I have a oVirt installation with 6 CentOS 6.4 hosts. Some (not all) hosts are receiving these error messages, at a frequency of once every other minute:

[root at vhost1 ~]# grep "source address" /var/log/messages | tail
Aug 17 11:19:20 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:21:24 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:23:29 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:25:34 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:27:39 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:29:44 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:31:49 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:33:54 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:35:59 vhost1 kernel: em1: received packet with own address as source address
Aug 17 11:38:04 vhost1 kernel: em1: received packet with own address as source address

These error messages are accompanied with loss of connectivity, with duration varies between a few seconds to minutes. The loss of connectivity would start just before the above error message.

I don't *think* it's hardware because the "received packet with own address" error message would disappear from one of the hosts after a while. These error messages are also present whether or not any VM is running on the particular host.

Here are some configurations:

[root at vhost1 ~]# ifconfig
em1       Link encap:Ethernet  HWaddr aa:bb:cc:dd:ee:f1  
          inet6 addr: aaaa::bbbb:cccc:dddd:eee1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:37413202 errors:0 dropped:0 overruns:0 frame:0
          TX packets:17822315 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:32444347931 (30.2 GiB)  TX bytes:13715272213 (12.7 GiB)
          Interrupt:16 

em2       Link encap:Ethernet  HWaddr aa:bb:cc:dd:ee:f2  
          inet6 addr: aaaa::bbbb:cccc:dddd:eee2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:21878 errors:0 dropped:0 overruns:0 frame:0
          TX packets:526 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1598070 (1.5 MiB)  TX bytes:40526 (39.5 KiB)
          Interrupt:17 

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:49 errors:0 dropped:0 overruns:0 frame:0
          TX packets:49 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:9236 (9.0 KiB)  TX bytes:9236 (9.0 KiB)

ovirtmgmt Link encap:Ethernet  HWaddr aa:bb:cc:dd:ee:f1  
          inet addr:xxx.xxx.xxx.xxx  Bcast:xxx.xxx.xxx.yyy  Mask:255.255.255.0
          inet6 addr: aaaa::bbbb:cccc:dddd:eeee/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:22623881 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9990988 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:28427312067 (26.4 GiB)  TX bytes:13112553784 (12.2 GiB)

private_lan Link encap:Ethernet  HWaddr aa:bb:cc:dd:ee:f2  
          inet addr:10.0.1.12  Bcast:10.0.1.255  Mask:255.255.255.0
          inet6 addr: aaaa::bbbb:cccc:dddd:eee2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:19771 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1080512 (1.0 MiB)  TX bytes:468 (468.0 b)
[root at vhost1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-em1
DEVICE=em1
ONBOOT=yes
HWADDR=aa:bb:cc:dd:ee:f2
BRIDGE=ovirtmgmt
NM_CONTROLLED=no
UUID=c25b1ad1-9646-4126-9149-be5f68bae36c
DNS2=www.www.www.www
DNS1=www.www.www.www
HOSTNAME=vhost1.mydomain.com
MTU=1500
IPV6INIT=no
[root at vhost1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ovirtmgmt 
DEVICE=ovirtmgmt
ONBOOT=yes
TYPE=Bridge
DELAY=0
IPADDR=xxx.xxx.xxx.xxx
NETMASK=255.255.255.0
GATEWAY=xxx.xxx.xxx.1
BOOTPROTO=none
NM_CONTROLLED=no
UUID=c25b1ad1-9646-4126-9149-be5f68bae36c
DNS2=www.www.www.www
DNS1=www.www.www.www
HOSTNAME=vhost1.mydomain.com
MTU=1500
IPV6INIT=no
[root at vhost1 ~]# 

Any help is appreciated.
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