Re: [ietf-smtp] Characteristics of Isolated (or mostly-isolated) industrial IP Networks

"John R Levine" <johnl@taugh.com> Sun, 05 January 2020 15:59 UTC

Return-Path: <johnl@taugh.com>
X-Original-To: ietf-smtp@ietfa.amsl.com
Delivered-To: ietf-smtp@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 386421200D5 for <ietf-smtp@ietfa.amsl.com>; Sun, 5 Jan 2020 07:59:55 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2
X-Spam-Level:
X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1536-bit key) header.d=iecc.com header.b=eEv5vS4v; dkim=pass (1536-bit key) header.d=taugh.com header.b=p9RaVEA7
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OBFOoVmO_pt7 for <ietf-smtp@ietfa.amsl.com>; Sun, 5 Jan 2020 07:59:52 -0800 (PST)
Received: from gal.iecc.com (gal.iecc.com [IPv6:2001:470:1f07:1126:0:43:6f73:7461]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1604312001E for <ietf-smtp@ietf.org>; Sun, 5 Jan 2020 07:59:51 -0800 (PST)
Received: (qmail 61820 invoked from network); 5 Jan 2020 15:59:50 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=iecc.com; h=date:message-id:from:to:cc:subject:in-reply-to:references:mime-version:content-type:user-agent; s=f17a.5e1207f6.k2001; i=johnl-iecc.com@submit.iecc.com; bh=L1HJ/CwkRHn0szEFCitMdapiFI5wtCfgnktXq9BBf2Y=; b=eEv5vS4vwcRX92IQtbt2rNQOPhH/aH+ZFBzjBXTNqp0HsMF2vegzgJEpVC9DN7XC5aE6gh8kToUlxyxyVMnSz9fcpiwyx/C80mibR5RmMRzQYzFIe+bRUkDXYEPtl5OHhduSC6OR6WT7TrDH02vIgUS06dZ4LnxHj0R2iv/f+1HhpjWm4pkz/UKbth2ryts2Q4aajqOf7r8bldILz/55ZAwuUqZ9DVLclfZ2uTmaQd98sPeDqslHVlpDGDRESVNB
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=taugh.com; h=date:message-id:from:to:cc:subject:in-reply-to:references:mime-version:content-type:user-agent; s=f17a.5e1207f6.k2001; olt=johnl-iecc.com@submit.iecc.com; bh=L1HJ/CwkRHn0szEFCitMdapiFI5wtCfgnktXq9BBf2Y=; b=p9RaVEA7EZj0ClunqEw5o5TiSoVZxxLiOPvtQpmb4IKev38H3B6gCVs0BxDAVTIAhQb+ux0iPLeGUw4GCmPAtLWUAd8TUTaZH42F+xaVSVWtq/NG1bzRS58o6M8aAQtCVUE0VqEO570Em3yznkPxptPPjJCWmj8+Ai17lyIXj7jBpbAxwT8E5v2i+EmyLPcbVpqA2PMQi8jwGFUaeBFYyBfGRoooLAnzB3766EjLpRkbt9DP/5qTpahWV4Svp7ti
Received: from localhost ([IPv6:2001:470:1f07:1126::78:696d:6170]) by imap.iecc.com ([IPv6:2001:470:1f07:1126::78:696d:6170]) with ESMTPSA (TLS1.3 ECDHE-RSA AES-256-GCM AEAD, johnl@iecc.com) via TCP6; 05 Jan 2020 15:59:50 -0000
Date: Sun, 05 Jan 2020 10:59:49 -0500
Message-ID: <alpine.OSX.2.21.99999.374.2001051055230.69263@ary.qy>
From: John R Levine <johnl@taugh.com>
To: Keith Moore <moore@network-heretics.com>
Cc: ietf-smtp@ietf.org
In-Reply-To: <e222998e-374f-07aa-024e-2b6fb9d39003@network-heretics.com>
References: <20200105021840.51DEA11FA155@ary.qy> <e222998e-374f-07aa-024e-2b6fb9d39003@network-heretics.com>
User-Agent: Alpine 2.21.99999 (OSX 374 2019-10-27)
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"; format="flowed"
Archived-At: <https://mailarchive.ietf.org/arch/msg/ietf-smtp/BaZ-hHv80M4bmE_i1NprN3ZFLcw>
Subject: Re: [ietf-smtp] Characteristics of Isolated (or mostly-isolated) industrial IP Networks
X-BeenThere: ietf-smtp@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Discussion of issues related to Simple Mail Transfer Protocol \(SMTP\) \[RFC 821, RFC 2821, RFC 5321\]" <ietf-smtp.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ietf-smtp>, <mailto:ietf-smtp-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ietf-smtp/>
List-Post: <mailto:ietf-smtp@ietf.org>
List-Help: <mailto:ietf-smtp-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ietf-smtp>, <mailto:ietf-smtp-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 05 Jan 2020 15:59:55 -0000

> At first glance it might seem like good sense to use a Raspberry Pi or 
> similar devices in some such scenarios. Though it's trickier that it might 
> seem at first.

I totally take your point about equipment needing to be suitable for an 
industrial environment.  My point, perhaps not well expressed, is that a 
pi has all the computing power needed for a mail gateway.

FWIW, there are a lot of vendors selling industrial raspberry pi's. 
Here's one of them:

https://revolution.kunbus.com/revolution-pi-series/

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly