Re: [B.A.T.M.A.N.] Alfred problem reading other nodes

[Simon Wunderlich <sw@simonwunderlich.de>]

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Hi Beth,

as Sven said, if both nodes are running in master mode then they should 
regularly synchronize their data. This happens by sending unicast (!) UDP 
packets to their respective link-local IPv6 addresses. In your dump, we can 
only see broadcasts of 4 bytes, most likely the announcements. But as you 
said, two different hosts are sending those announcements, so that part seems 
to work.

Since announcement from both ends are visible, it could still be that your 
firewall drops it. Did you try disabling the firewall completely (e.g. /etc/
init.d/firewall stop, iptable -F etc ...)?

If that doesn't help, the best way would be to instrument the code (recv.c as 
Sven suggested) to see if the announcements are received. we don't really have 
debug code there.

Cheers,
      Simon

On Wednesday, February 6, 2019 1:47:14 PM CET beth.flippo@telegrid.com wrote:
> We are using a gateworks board and built the latest version from their bsp
> but we had batman-adv, batctl and Alfred ipk built at version 2018.0.
> Batman and batctl are both working.
> 
> root@OpenWrt:~# uname -a
> Linux OpenWrt 4.4.0 #16 SMP Tue Jan 29 19:41:46 UTC 2019 armv7l GNU/Linux
> root@OpenWrt:~# cat /etc/openwrt_release DISTRIB_ID='Gateworks'
> DISTRIB_RELEASE='Gateworks Ventana 16.02@dd98aee-dirty'
> DISTRIB_REVISION='r48868'
> DISTRIB_CODENAME='designated_driver'
> DISTRIB_TARGET='imx6/generic'
> DISTRIB_DESCRIPTION='Gateworks Designated Driver Gateworks Ventana
> 16.02@dd98aee-dirty'
> DISTRIB_TAINTS='no-all busybox'
> root@OpenWrt:~#
> 
> 
> 
> -----Original Message-----
> From: Sven Eckelmann <sven@narfation.org>
> Sent: Wednesday, February 6, 2019 1:14 PM
> To: b.a.t.m.a.n@lists.open-mesh.org
> Cc: beth.flippo@telegrid.com; s.pinsky@telegrid.com
> Subject: Re: [B.A.T.M.A.N.] Alfred problem reading other nodes
> 
> On Wednesday, 6 February 2019 17.56.00 CET beth.flippo@telegrid.com wrote:
> [...]
> 
> > I am having a problem getting alfred retrieve info from other nodes.
> > I am running openwrt and alfred 2018.0.
> 
> Which OpenWrt version should that be? There is no release with 2018.0 and
> the current version in master is also newer.
> 
> > I am able to start the alfred server with no errors both from boot and
> > the command line.
> > 
> > root@OpenWrt:~# /etc/init.d/alfred restart
> > /etc/init.d/alfred: waiting 30 secs for br-lan address...
> > /etc/init.d/alfred: starting alfred
> > /etc/init.d/alfred: starting batadv-vis
> > 
> > I can see it with ps
> > 
> > 4290 root       816 S    /usr/sbin/alfred -i br-lan -m -b bat0
> > 
> > I can issue a set and then a receive and I see the value I set but
> > only locally.  It does not get any info from the other nodes in my
> > network.  They are all running alfred servers as master.
> 
> Have you checked whether process_alfred_announce_master (recv.c) rejects the
> incoming packet for some reason and thus doesn't add it to the server list?
> 
> If not, have you checked whether sync_data (send.c) really sends out the
> data via push_data to the remote server?
> 
> > I have added a firewall rule to open the port.
> > 
> > If I have 2 nodes running alfred and I run 'tcpdump -i br-lan udp port
> > 16962' - I see packets from the other node:
> > 
> > 16:21:49.279086 IP6 fe80::2d0:12ff:fe00:f0c7.16962 > ip6-allnodes.16962:
> > UDP, length 4
> 
> [...]
> 
> > I think these might be the master announcements but when I issue an
> > alfred -r # - I do not see any new messages in the tcpdump.
> 
> If all daemons are in server mode then they will not create a request via
> `alfred -r`. Instead, they regularly sync [1] their facts between each other
> (same port but different packet type).
> 
> Kind regards,
> 	Sven
> 
> [1]
> https://www.open-mesh.org/projects/alfred/wiki/Alfred_architecture#Synchroni
> zation


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