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Date:      Sun, 11 Aug 2002 13:45:31 +0300
From:      Ruslan Ermilov <ru@FreeBSD.org>
To:        Archie Cobbs <archie@dellroad.org>
Cc:        cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/sys/netinet in_rmx.c ip_input.c ip_var.h
Message-ID:  <20020811104531.GA11677@sunbay.com>
In-Reply-To: <200208091716.g79HGno08306@arch20m.dellroad.org>
References:  <20020809145837.GD38763@sunbay.com> <200208091716.g79HGno08306@arch20m.dellroad.org>

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On Fri, Aug 09, 2002 at 10:16:49AM -0700, Archie Cobbs wrote:
[...]
> > BTW, Archie, kudos for making mpd(8) work in a scenario documented
> > in the BUGS section of libalias(3).  How this is done?
>=20
> The PPTP spec assumes that only one control connection (i.e., TCP port
> 1723) will exist between any two IP addresses.
>=20
Yes, I know.

> Originally, mpd was written to honor that. However, unless you are
> identifying the peer by its IP address, there's no real need to disallow
> multiple connections from the same IP address. So mpd was changed
> to allow multiple connections when possible. Although this violates
> the spec, it's a beneficial change. Consider it a bug in the spec :-)
>=20
Yes, but this means that you should somehow share the pool of locally
allocated CallID's for a given peer.  How this is done?  Does mpd(8)
fork to serve each new connection?  Or is it implemented entirely
within the kernel (netgraph(4))?

> FYI, you may notice that L2TP, which came after PPTP, doesn't make
> this useless assumption. Any number of L2TP control connections may
> exist between two peers.
>=20
> Cheers,
> -Archie
>=20
> __________________________________________________________________________
> Archie Cobbs     *     Packet Design     *     http://www.packetdesign.com

--=20
Ruslan Ermilov		Sysadmin and DBA,
ru@sunbay.com		Sunbay Software AG,
ru@FreeBSD.org		FreeBSD committer,
+380.652.512.251	Simferopol, Ukraine

http://www.FreeBSD.org	The Power To Serve
http://www.oracle.com	Enabling The Information Age

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