[Swan] No Traffic Received On Tunnels

[Paul Wouters]

On Wed, 10 Jul 2019, Adam Tauno Williams wrote:

> Both tunnel interfaces show outbound (TX) traffic.
>
> I can packet capture ESP packets leaving the server's primary interface
> which correspond to the remote endpoint.
>
> Neither appears to receive any traffic to the tunnel interfaces.
>
> EXISTING SITE: 006 #23: "btc-gre", type=ESP, add_time=1562755016, inBytes=1967115, outBytes=5936, id='X.X.X.X'
> NEW SITE: 006 #25: "ets-gre", type=ESP, add_time=1562755016, inBytes=0, outBytes=352, id='X.X.X.X'

So either the outgoing packets never make it, or the packets are deemed
bad, or the responses never make it back. Most likely, the problem
resides on the remote endpoint, not the libreswan endpoint.

Paul