Cannot access other computers on LAN

[Lars Kruse]

Hi Julien,


Am Mon, 14 Jan 2019 18:04:40 +0100
schrieb Julien dupont <marcelvierzon at gmail.com>:

> Investigating with tcpdump withoug guidelines is beyond my skills I'm
> afraid.

Try this on your VPN_office host:
 tcpdump -npi any icmp and host 192.168.1.3
In parallel you start a ping from the other network:
 ping 192.168.1.1

I assume, that tcpdump will show all packets from your source. Probably you
will see two packets each (with a slight delay of a few milliseconds). These
are the packets forwarded to the outgoing interface.
Furthermore I assume, that you do not see any return traffic.

Feel free to share a few lines of seemingly relevant output from tcpdump with
us.

Another (unrelated) test:
Please run "ping SOME_IP_FROM_THE_OTHER_NETWORK" on 192.168.1.1.
Please share the output with us.
I assume, that the packet goes out via your WAN (instead of flowing towards
192.168.1.3) and is thus rightfully rejected.


> I used tinc in router mode because it is proposed like in most howto I
> found... Would just switching to switch mode makes things easier or that's
> not related?

No, router mode should be fine for your purpose.

Cheers,
Lars