Date: Sat, 18 Jul 2020 16:23:52 +0300 From: Alexandr Baryshnyev <abb@abbon.net> To: "Alexander V. Chernikov" <melifaro@ipfw.ru>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: How to increase the size of the MAC address caching table? Message-ID: <b8330296-ce46-b1a0-df95-8b2a678bc21f@abbon.net> In-Reply-To: <1073051595077683@mail.yandex.ru> References: <fcebf573-820a-cdd5-6f03-f24b2123d1a4@abbon.net> <1073051595077683@mail.yandex.ru>
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18.07.2020 16:16, Alexander V. Chernikov пишет:
> 18.07.2020, 13:56, "Alexandr Baryshnyev" <abb@abbon.net>:
>
> Hello everybody.
>
> I have about 1,500 devices on the network, but in fact the MAC address table on the central router running Freebsd
> 12.0 never contains more than 1000 with small cached records. In the network, there are short-term random interruptions
> between different hosts and the router. The connection to the Internet on different computers in the network is lost for
> a short time. No apparent cause of these breaks was found.
>
> How often does this happens and what is the average "short-term" duration?
> I'd look into route -n monitor (don't remember if arp state reporting was merged into 12.0) and try to tcpdump arp
> traffic to get understanding what's happening here.
> Also: does this router perform TCP termination of the flows toward Internet?
>
>
> There is a suspicion that the MAC address table on the FreeBSD router has a limited size, about 1000 with a small
> record maximum. Is that so? Is it possible to increase the size of this table if it is limited? An internet search was
> not successful.
>
> It's not limited.
>
>
> Help me, please.
>
> > arp -an | grep -ve incomplete | wc -l
> 1055
>
> "Incomplete" are still entries in the per-interface mac address table. What's the size with incomplete ones?
> arp -an | wc -l
1183
> ifconfig bridge0 addr | wc -l
1214
>
> Thank you.
>
> --
> Best regards,
> Alexandr B. Baryshnyev, e-mail: abb@abbon.net <mailto:abb@abbon.net>
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--
Best regards,
Alexandr B. Baryshnyev, e-mail: abb@abbon.net
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