Re: batadv gw_mode client 0?

[Sven Eckelmann <sven@narfation.org>]

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On Wednesday, 24 June 2020 21:43:18 CEST Rob Cowart wrote:
> >    ssh fe80::6c39:baff:fe1c:6d11%wlan0
> Yes we knew this, this is Standard Operating Procedure, but atm nothing responds on ping.

When nothing reacts to pings on wlan0 then your lower link is most likely 
broken. batman-adv can also not help here when the link on which it operates 
is "dead".

> > Not sure what the ELP interval is here but the last seen is extremely high. I 
> > would guess that the lower link actually broke down and the neighbor entries
> > just  didn't time out yet.
> How do I tell you what the ELP is?

Echo Location Protocol [1]. It is similar to the OGM messages in 
B.A.T.M.A.N. IV - but only used between single hop neighbors (and sometimes 
also as unicast instead of broadcast)

> we (my boss who tries to be a software engineer) have definitely messed a lot with the batctl settings.

The elp interval can be checked on recent batctl versions using:

    batctl hardif wlan0 elp_interval

Or on systems which are using sysfs for configuration:

    cat /sys/class/net/wlan/batman_adv/elp_interval


The OGM(2) interval can be checked using

    batctl meshif bat0 orig_interval

Or on systems which are using sysfs for configuration:


    cat /sys/class/net/bat0/mesh/orig_interval


Both values are in milliseconds


> pi@raspberrypi:~/xeco-master/enola-daemon $ sudo batctl s 

The ELP packets (and much more) are part of mgmt_tx/mgmt_tx_bytes/mgmt_rx/
mgmt_rx_bytes.


> pi@raspberrypi:~/xeco-master/enola-daemon $ sudo batctl td bat0
> 14:42:51.260179 IP6 fe80::4829:b9ff:fea5:8a76.16962 > fe80::d486:8dff:fe7d:394d.16962: UDP, length 218

ELP messages are not sent on top of bat0 but on the lower interface (wlan0 in 
your case). So you have would have to run "batctl td wlan0". Or create a pcap 
on wlan with tcpdump and open it in a recent version of wireshark.

Kind regards,
	Sven

[1] https://www.open-mesh.org/projects/batman-adv/wiki/ELP

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