Date: Tue, 11 Jan 2011 07:36:26 -0800 From: "Li, Qing" <qing.li@bluecoat.com> To: "Melissa Jenkins" <melissa-freebsd@littlebluecar.co.uk>, <freebsd-net@freebsd.org> Subject: RE: PPP and Route Delete Message-ID: <B583FBF374231F4A89607B4D08578A430823C9CF@bcs-mail03.internal.cacheflow.com> References: <63A5C79A-B4C3-42C3-9B76-1F2EB04DB871@littlebluecar.co.uk><01EE1F52-3393-4A43-882F-C35677CB0754@gmail.com> <F850408F-1FCF-4817-BB62-6C6CD968FB92@littlebluecar.co.uk>
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The self-pointing route 10.0.5.1 should have multiple references set on
it, and that route won't be deleted from the routing table until the=20
last reference is removed.
=20
You can verify that by checking the "netstat" output, the "Ref" column
after tun1 has been created.
=20
The above has been verified with both mpd and other tests.
=20
-- Qing
________________________________
From: owner-freebsd-net@freebsd.org on behalf of Melissa Jenkins
Sent: Tue 1/11/2011 3:34 AM
To: freebsd-net@freebsd.org
Subject: Re: PPP and Route Delete
> I've been working on migrating a PPTP server from FreeBSD 7.1 to =
FreeBSD 8.1. The server is configured using PopTop (from ports) and PPP =
(/usr/sbin) rather than MPD. (Before anybody tells me to use MPD we =
can't because it doesn't inject packets into the kernel in the same way =
and it's not possible to filter on them correctly)
>
> Basic PPTP connection works properly.=20
>
> The fun happens when I have two simultaneous users. The first one to =
DISCONNECT deletes the routes for both of them and all PPTP traffic =
ceases.
Just been working my way through the PPP code - which doesn't actually =
appear to have changed.
However, the netinet/in.c does have some comments in the SVN history =
about deleting the loopback address, this appears to have been merged in =
as part of the 8 release cycle (r197231 perhaps) (though I'm not an =
expert at SVN etc)
What should happen when there are multiple interfaces with the same =
address. When I have two tunnels configured they show up as (eg)
tun0: flags=3D8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1398
options=3D80000<LINKSTATE>
inet 10.0.5.1 --> 10.0.0.31 netmask 0xffffffff
Opened by PID 12616
tun1: flags=3D8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1398
options=3D80000<LINKSTATE>
inet 10.0.5.1 --> 10.0.0.32 netmask 0xffffffff
Opened by PID 12630
If the loop back address is 10.0.5.1 and closing one of them deletes the =
loopback what should happen? Should it delete all routes that refer to =
10.0.5.1?
Mel
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