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

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

--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.