[Babel-users] Debugging unreachable routes - IPv6 as next hop?

[Juliusz Chroboczek]

> Sun Feb 19 17:15:45 2017 daemon.info babeld[1171]: Neighbour
> fe80::227:22ff:fe2e:4153 dev wlan0 reach ffff rxcost 256 txcost 65535
> rtt 0.000 rttcost 0 chan 1.

It looks like an asymmetric link -- the local node hears neighbour 4153,
but 4153 doesn't hear the local node.  If you manage to reproduce that,
could you please also show the log on the node that advertises the
infinite txcost?

(Note that this can happen if for some reason you're running two instances
of babeld on the same node -- the two instances stomp on each other's
packets, and get confused.  Since OpenWRT/LEDE no longer uses a pidfile,
there is no mechanism in babeld that prevent that from happening.  Please
check with ps.)

-- Juliusz