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Date:      Mon, 4 Mar 2019 18:21:21 +0700
From:      Eugene Grosbein <eugen@grosbein.net>
To:        "Patrick M. Hausen" <hausen@punkt.de>, FreeBSD Net <freebsd-net@freebsd.org>
Subject:   Re: TCP-forwarding with netcat - weird failures ...
Message-ID:  <a9a82e56-f7a7-97dd-86ba-948d91704ca2@grosbein.net>
In-Reply-To: <D3EF7ABA-7674-4F7B-8ED2-21CED3BFB975@punkt.de>
References:  <D3EF7ABA-7674-4F7B-8ED2-21CED3BFB975@punkt.de>

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04.03.2019 17:43, Patrick M. Hausen wrote:

> Needless to say: doesn’t work. And no, it’s not the obvious ARP caches.
> Connections can be established but then abort spontaneously without
> an observable pattern or reason.

Each "abort" of TCP connection has its own distinct reason:
TCP FIN or TCP RST or ICMP unreach or timeout etc.

You need to start collecting packet captures with "tcpdump -npw file.pcap"
Without such details, noone can tell you what's your reason out of hundreds possible.




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