[Users] received packet with own address as source address

Wed Aug 21 20:26:57 UTC 2013

The switch is connected to the internet via the school's switch. Currently (as well as when I received the error messages last time) portfast is disabled for all ports, and STP enabled for all ports except for the port connecting my switch to the school's.

On Aug 20, 2013, at 11:50 PM, Assaf Muller <amuller at redhat.com> wrote:

>> The problem was also present when I just had one interface connected to the switch, connected to the Internet.
> 
> How was the switch connected to the internet? Is it connected to other switches?
> 
> To solve the loop you can make sure that STP is enabled on all switches and to disable portfast.
> 
> ----- Original Message -----
> From: "H. Haven Liu" <haven.liu at ucla.edu>
> To: "Assaf Muller" <amuller at redhat.com>
> Cc: Users at ovirt.org
> Sent: Tuesday, August 20, 2013 6:09:09 PM
> Subject: Re: [Users] received packet with own address as source address
> 
> Hello,
> 
> After I reinstalled the host, the problem seems to have disappeared. This is not to say it's not going to come back, as it has done before. 
> 
> I know the nodes were not receiving the error message *before* I installed VDSM (which configured the bridge?), but I haven't tried uninstalling to see if the problem would go away. The problem was also present when I just had one interface connected to the switch, connected to the Internet.
> 
> If the problem is indeed a classic L2 loop, how do I go about resolving it? Is it due to bridge (mis)configuration, or is it in the network switch settings? I have tried enabling and disabling STP and portfast, which didn't seem to have any effect.
> 
> Thanks,
> 
> Haven
> On Aug 20, 2013, at 12:26 AM, Assaf Muller <amuller at redhat.com> wrote:
> 
>> 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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