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Date:      Thu, 16 Jul 2020 14:20:00 +0700
From:      Eugene Grosbein <eugen@grosbein.net>
To:        lutz@donnerhacke.de, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
Subject:   Re: [Differential] D25681: if_spppsubr: Define a few LCP options, Recognize (but still reject) multilink PPP config options
Message-ID:  <aa0c256d-dfc2-1651-67dd-c433a25d6d7d@grosbein.net>
In-Reply-To: <2207286f8cb07c7ec78a86dcb90d4a32@localhost.localdomain>
References:  <differential-rev-PHID-DREV-vnxglrfwqvfleoykt74t-req@reviews.freebsd.org> <2207286f8cb07c7ec78a86dcb90d4a32@localhost.localdomain>

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16.07.2020 14:12, lutz_donnerhacke.de (Lutz Donnerhacke) wrote:

>   > ce(4) for PCI G.703/E1 card,
>   > cp(4) for PCI V.35/RS-232/RS-530/RS-449/X.21/G.703/E1/E3/T3/STS-1 cards,
>   > and cx(4)/ctau(4) for some ISA cards but these do not exist in FreeBSD 13 anymore,
>   > removed by emaste@ recently.
>   >
>   > Both ce(4) and cp(4) are i386-only drivers at present.
>   
>   Such synchronous lines are still in use (here):
>   
>   - G.703 is common in phone systems.
>   - X.21 for leased lines (with old contracts),
>   - E1/E3 for SDH (carrier grade) leases lines.
>   - RS-232 is the ordinary serial port, the other RS- are industry specific serials (mainly other voltages)

This is not about lines and protocols, this is about old PCI cards for PCs manufactured 15+ years ago.

>   But you are right: Do we really need a specialized PPP hardware support these days?
>   Do we really want to run a recent kernel on this antique hardware? It would be a sacrilege.
>   
>   Normal PPP over serial lines (currently available) does work using ppp(4)




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