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Date:      Wed, 9 Dec 2020 00:40:59 +0000
From:      tech-lists <tech-lists@zyxst.net>
To:        freebsd-questions@freebsd.org
Subject:   Re: strange tcp behavior; all systems except 1 connect to google compute engine
Message-ID:  <X9AdG1RRsCf26wsD@bastion.zyxst.net>
In-Reply-To: <10f8d534-8e2a-169a-388f-5df8a2304fd2@dreamchaser.org>
References:  <10f8d534-8e2a-169a-388f-5df8a2304fd2@dreamchaser.org>

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--RGuf+uzzecYmo/93
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Hi,

On Sat, Dec 05, 2020 at 01:39:31PM -0700, Gary Aitken wrote:

[...]

I'm not an expert, but I'd just like to say that I get the exact same issues
if I fail to account for jumbo frames and overhead at the handover point of=
 my
connection, which is fibre.

All my interfaces are jumbo-capable. I have a dmz (nothing on it right now
apart from my NATting router) and an edgerouter lite 3 device running
OpenBSD 6.8 and pppoe. On the pppoe config I have MTU 1500. On the ethernet
I have MTU 1520. If I were to set the ethernet interface equal or less
than the pppoe interface, then I can't access some sites and these
include all the common search engines. No mss clamping is set in pf.conf.

I don't know the technical why, though. Hope this helps,
--=20
J.

--RGuf+uzzecYmo/93
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