Host not reachable over UDP

[Etienne Dechamps]

That's strange. Can you post a detailed log from the affected node (run
tincd -d5 -D), especially the initialization phase?

On 13 July 2016 at 16:17, Petr Man <petr at madnetwork.org> wrote:

> Dear all,
>
> I have been successfully running for quite some time a tinc 1.1 network in
> switch mode. I recently added a new node, that refuses to communicate over
> UDP.
> Running "tinc info mynode" from a different box returns:
> Reachability: directly with TCP
>
> It appears that tincd is not listening on UDP port 655 on "mynode".
> Running "ss -nlptu | grep tincd":
> tcp    LISTEN     0      3         *:655                   *:*
>       users:(("tincd",pid=10097,fd=6))
>
> In the log there is a large number of these messages:
> Received UDP packet from unknown source 123.321.123.321 port 655
>
> I am puzzled how is tincd getting the packets if it is not listening on
> 655/UDP.
>
> When I start netcat on the node on port 655/UDP I can see garbage coming
> in from the other nodes trying to initiate an UDP connection.
>
> Would you have any hints where to start debugging this? All machines are
> configured the same way and work fine (various linux versions, windows).
> This particular box is on Ubuntu Xenial kernel 4.3.5.
>
> Best,
> Petr
>
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>
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