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From: "Michael A. Kangin" <mak@complife.ru>
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Date: Wed, 25 Apr 2018 00:40:18 +0200
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Subject: Re: [Sysadmins] p8, squid transparent proxy
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On 04/24/2018 10:41 PM, Sergey wrote:

> Работает, но почему-то не вышло с DNAT на localhost. После смены на обычный
> интерфейс (тоже локальный) заработало.

Попробуйте REDIRECT.
Типа:

-A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128