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Date: Fri, 18 Dec 2015 21:10:48 +0300
From: Aleksandr A Babaylov <.@babolo.ru>
To: bcs <bimmer@field.hu>
Cc: freebsd-net@freebsd.org
Subject: Re: arp response fails
Message-ID: <20151218181048.GA68478@babolo.ru>
References: <5670988B.5030905@field.hu>
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On Tue, Dec 15, 2015 at 11:47:39PM +0100, bcs wrote:
> I have 3 FreeBSD 10.2-RELEASE machines and all of them suffers of the 
> following problem. They are not responding to ARP requests which causes 
> network problem for me, other hosts can't access my FBSD machines on the 
> LAN nor my FBSD hosts can see each other unless I add permanent arp entry.
> 
> [root@fbsd10 /]# arping my.host.hu
> ARPING x.x.x.x
> Timeout
> Timeout
> Timeout
> 
> Pinging a linux host is ok from my bsd host:
> [root@cool /]# arping linux.host.hu
> ARPING y.y.y.y
> 60 bytes from 00:15:17:ae:0c:44 (y.y.y.y): index=0 time=189.143 usec
> 60 bytes from 00:15:17:ae:0c:44 (y.y.y.y): index=1 time=335.541 usec
> 60 bytes from 00:15:17:ae:0c:44 (y.y.y.y): index=2 time=200.227 usec
> ^C
> 
> I use ipfw but "ipfw -q -f flush" didn't solve the issue. Here are my 
> sysctl.conf:
> security.bsd.see_other_uids=0
> net.inet.tcp.recvspace=512000
> net.route.netisr_maxqlen=2048
> kern.ipc.nmbclusters=1310720
> net.inet.tcp.sendbuf_max=16777216
> net.inet.tcp.recvbuf_max=16777216
> kern.ipc.soacceptqueue=32768
> vm.v_free_min=19170
> 
> /boot/loader.conf:
> ipfw_load="YES"
> net.inet.ip.fw.default_to_accept=1
> kern.maxusers=4096
> accf_data_load="YES"
> hw.em.rxd=4096
> 
> any idea how to enable arp response?

I have similar behavior on ale interace
with vlans on it.
Change for re interface on that server
works for me.