hello all,

I have finally build an internet gateway with OpenBSD 6.2 (AMD64), including pf 
and IPSec. Great stuff. 
Now I am seeing a lot of arp movement, that I know are caused by Apple's 
Bonjour Sleep Proxy.

Nov  8 00:00:27 gatekeeper /bsd: arp info overwritten for 192.168.20.99 by 
00:46:ab:ba:19:87 on vmx0
Nov  8 00:00:58 gatekeeper /bsd: arp info overwritten for 192.168.20.99 by 
9c:ab:3b:ca:fe:99 on vmx0
Nov  8 00:01:57 gatekeeper /bsd: arp info overwritten for 192.168.20.99 by 
00:46:ab:ba:19:87 on vmx0
Nov  8 00:02:04 gatekeeper /bsd: arp info overwritten for 192.168.20.99 by 
9c:ab:3b:ca:fe:99 on vmx0
Nov  8 00:02:35 gatekeeper /bsd: arp info overwritten for 192.168.20.99 by 
00:46:ab:ba:19:87 on vmx0
Nov  8 00:03:28 gatekeeper /bsd: arp info overwritten for 192.168.20.99 by 
9c:ab:3b:ca:fe:99 on vmx0
Nov  8 00:03:42 gatekeeper /bsd: arp info overwritten for 192.168.20.99 by 
00:46:ab:ba:19:87 on vmx0
Nov  8 00:04:27 gatekeeper /bsd: arp info overwritten for 192.168.20.99 by 
9c:ab:3b:ca:fe:99 on vmx0

These messages are repeating every 15-30 seconds for Apple devices like laptops 
that are in standby (sleep mode).

On pfSense and FreeBSD you have a sysctl: net.link.ether.inet.log_arp_movements
when set to zero it will no longer log the messages.

Discussions can be found on internet dating back to 2010, but no solution has 
been provided for what I could find.
I have not yet found any sysctl in OpenBSD to do the same. Did I miss something 
or does OpenBSD have any trick to not log these messages.
Currently these messages are filling up the logs /var/run/dmesg.boot and 
/var/log/messages.

Marco PC

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