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

[Baptiste Jonglez]

On Mon, Feb 20, 2017 at 03:20:49AM +0100, Juliusz Chroboczek wrote:
> > 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.

This could be caused by a misconfigured firewall, that drops babeld
packets in one direction but not in the other one.

Can you make sure that packets from fe80::/10 to fe80::/10 on UDP port
6696 are allowed on both routers?

Baptiste
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