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Date: Thu, 26 Jul 2018 09:24:01 +0200
From: Linus =?utf-8?Q?L=C3=BCssing?= <linus.luessing@c0d3.blue>
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Subject: Re: [B.A.T.M.A.N.] ICMP6 flood or nodes limit ?
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On Wed, Jul 25, 2018 at 10:50:10PM +0300, Nicu Pavel wrote:
> root@gateway-b827ebecbfa7:~# batctl o
> [B.A.T.M.A.N. adv 2018.2, MainIF/MAC: wlan0/b8:27:eb:ec:bf:a7 (bat0/4e:06:5f:54:e5:d5 BATMAN_IV)]
>    Originator        last-seen (#/255) Nexthop           [outgoingIF]
>    b8:27:eb:a7:ed:ff    0.330s   ( 24) b8:27:eb:ad:4b:7e [     wlan0]
>    b8:27:eb:a7:ed:ff    0.330s   (  0) b8:27:eb:ec:e5:9f [     wlan0]
>    b8:27:eb:a7:ed:ff    0.330s   ( 43) b8:27:eb:97:55:b6 [     wlan0]
>    b8:27:eb:a7:ed:ff    0.330s   ( 38) b8:27:eb:1b:61:f0 [     wlan0]
>    b8:27:eb:a7:ed:ff    0.330s   ( 15) b8:27:eb:91:5c:41 [     wlan0]
[...]

Overall, the TQ values seem rather low.

>  root@gateway-b827ebecbfa7:~# batctl n
> [B.A.T.M.A.N. adv 2018.2, MainIF/MAC: wlan0/b8:27:eb:ec:bf:a7 (bat0/4e:06:5f:54:e5:d5 BATMAN_IV)]
> IF             Neighbor              last-seen
>         wlan0     b8:27:eb:ad:df:c0    1.000s
>         wlan0     b8:27:eb:30:15:c9    0.390s
>         wlan0     b8:27:eb:a8:22:f6    1.560s
>         wlan0     b8:27:eb:92:eb:b8    0.650s
[...]
>         wlan0     b8:27:eb:bb:a1:94   11.710s
>         wlan0     b8:27:eb:91:5c:41    1.480s
>         wlan0     b8:27:eb:5f:eb:e8    7.600s

Those are quite a lot of neighbor nodes. Do you actually have any
airtime left? I can recommend H.O.R.S.T. to check that:

https://github.com/br101/horst

As a rule of thumb, BATMAN IV overhead increases linear to the
overall number of mesh nodes, but squared to the number of
neighbor nodes a particular node has.

Also, just to be on the safe side, check that there is no MAC
address conflict / duplicate MAC address somewhere.

Regards, Linus