Date: Thu, 01 Jan 1998 13:25:32 +0000 From: Brian Somers <brian@awfulhak.org> To: John-Mark Gurney <gurney_j@efn.org> Cc: freebsd-bugs@hub.freebsd.org, freebsd-hackers@FreeBSD.ORG, joerg@FreeBSD.ORG Subject: Re: kern/5404: slXX slip (tun & ppp) interfaces always point to point Message-ID: <199801011325.NAA17803@awfulhak.demon.co.uk> In-Reply-To: Your message of "Wed, 31 Dec 1997 17:30:01 PST." <199801010130.RAA10049@hub.freebsd.org>
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[cc'd to joerg and freebsd-hackers]
> The following reply was made to PR kern/5404; it has been noted by GNATS.
>
> From: John-Mark Gurney <gurney_j@efn.org>
> To: Matthew Dillon <dillon@backplane.com>
> Cc: FreeBSD-gnats-submit@FreeBSD.ORG
> Subject: Re: kern/5404: slXX slip interfaces always point to point
> Date: Wed, 31 Dec 1997 17:23:58 +875200
>
[.....]
> or are you wanting to do something like:
>
> +-------------+ +-------------+
> | machine a |-------| machine b |---- rest of 192.168.3.x
> | 192.168.3.2 | | 192.168.3.1 |
> +-------------+ +-------------+
>
> and trying to get machine a on the same network as machine b?
>
> if your going for the second one, you need proxyarp on machine b...
> I've actually done something similar to this before... actually my
> terminal server is setup like that... the ethernet is 192.168.0.x.. and
> the ip's for the dialin's are 192.168.40-60 or so...
[.....]
This ties in with a recent discussion on -hackers:
> Brian Somers <brian@awfulhak.org> wrote:
>
> > I agree, and I'll implement the change unless someone has a good
> > reason not to..... any takers ?
>
> I think it's really best to just not display the netmask in the output
> of ifconfig iff IFF_POINTOPOINT is set.
>
> Routes to the remote end apart from the implied host route seem to be
> dangerous to me, and they break the current behaviour (i.e. could
> cause surprises for people who are used to how it's done now). It's
> not always that the IP address of the remote end is indeed identical
> with the remote network address.
>
> --
> cheers, J"org
I intended to remove the possibility of netmasks and broadcast
addresses for pointopoint links, but retrospectively, this will break
the ability to attach to a peer that proxy arps for you (well, it's
already broken).
I would suggest (and I'm willing to do it) adding the ability to use
SIOCSIFPOINTOPOINT and SIOCGIFPOINTOPOINT on sl* ppp* and tun*. The
default is that these interfaces are pointopoint, but you can change
that by issuing the `S' ioctl. Additionally, I'd change ifconfig so
that it doesn't display a netmask & broadcast address when the
POINTOPOINT flag is set.
I can then implement the ability to make these interfaces
non-pointopoint in their respective programs - if configured that
way.
None of the existing code would break as the defaults are the same.
Comments ?
--
Brian <brian@Awfulhak.org>, <brian@FreeBSD.org>, <brian@OpenBSD.org>
<http://www.Awfulhak.org>;
Don't _EVER_ lose your sense of humour....
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