Re: arp flapping after udating system to 11-CURRENT.

On 2016-02-03 10:32, Chris H wrote:
> On Wed, 03 Feb 2016 06:55:47 -0800 "Chris H" <bsd-lists_at_bsdforge.com> wrote
> 
>> On Wed, 3 Feb 2016 08:31:43 +0100 Peter Ankerstål <peter_at_pean.org> wrote
>>
>>> Hi!
>>>
>>> I recently upgraded my system to 11-CURRENT (FreeBSD 11.0-CURRENT #0 
>>> r295087: Sun Jan 31 10:21:31 CET 2016) and after that all of my other 
>>> devices in the network complains about arp-flapping:
>>>
>>> arp: 172.25.0.1 moved from 00:00:24:d0:9e:5d to 02:e8:ea:15:66:00 on re0
>>> arp: 172.25.0.1 moved from 02:e8:ea:15:66:00 to 00:00:24:d0:9e:5d on re0
>>> arp: 172.25.0.1 moved from 00:00:24:d0:9e:5d to 02:e8:ea:15:66:00 on re0
>>>
>> FWIW I'm seeing this too. As it happened; I had just changed upstream
>> providers, getting a larger static block (IP's), as well as updating
>> my long overdue -CURRENT. So I simply blamed it on their (upstream)
>> network. I'd love to get to the bottom of this, and would be happy to
>> help.
>>
>> FreeBSD dev-box 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r294112:
>> Mon Jan 18 14:25:01 PST 2016 root_at_dev-box:/usr/obj/usr/src/sys/DEVBOX amd64
>>
>> src is at Revision: 406193
>>
> Well, it would have helped if I had also mentioned that I'm not using
> a bridge, and list the interfaces involved. :/
> 
> nfe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> options=82008<VLAN_MTU,WOL_MAGIC,LINKSTATE>
> 
> This also occurs on my 9-STABLE boxes
> re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500  
> options=8209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,LINKSTATE>
> 
> nfe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> options=82008<VLAN_MTU,WOL_MAGIC,LINKSTATE>
> 
> nfe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> options=82008<VLAN_MTU,WOL_MAGIC,LINKSTATE>
> 
> --Chris
>>
>>>
>>> It seems to be flapping between the virtual mac of my bridge interface 
>>> and the actual mac adress on the physical interface. This was not the 
>>> case when i ran FreeBSD 10.2. Is there some settings I need to do?
>>>
>>>
>>> bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
>>> 1500
>>>          description: wired <-> wifi bridge
>>>          ether 02:e8:ea:15:66:00
>>>          inet 172.25.0.1 netmask 0xffffff00 broadcast 172.25.0.255
>>>          inet6 2001:470:de59::1 prefixlen 64
>>>          inet6 fe80::2%bridge0 prefixlen 64 scopeid 0xb
>>>          nd6 options=1<PERFORMNUD>
>>>          groups: bridge
>>>          id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
>>>          maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
>>>          root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
>>>          member: wlan2 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>>>                  ifmaxaddr 0 port 10 priority 128 path cost 66666
>>>          member: wlan1 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>>>                  ifmaxaddr 0 port 9 priority 128 path cost 66666
>>>          member: wlan0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>>>                  ifmaxaddr 0 port 8 priority 128 path cost 22222
>>>          member: em1 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>>>                  ifmaxaddr 0 port 2 priority 128 path cost 2000000
>>>
>>> em1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 
>>> mtu 1500
>>>          description: wired LAN
>>>  
>>> options=42098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWTSO>
>>>          ether 00:00:24:d0:9e:5d
>>>          nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>>>          media: Ethernet autoselect (1000baseT <full-duplex>)
>>>          status: active
>>>
>>>
>>> /Peter.
>>
>>
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> 
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Chris:
If you are not using a bridge, please provide the complete output of
ifconfig, and the log messages about the arp flapping, so we can see
which two interfaces it is bouncing between.

-- 
Allan Jude