[cisco-nas] L2TP LAC to LNS

Alex Foster afoster at gammatelecom.com
Wed Jul 19 07:18:43 EDT 2006

Hi Oli,

I was actually just looking at this from advice from someone else - but
it looks as thought the version I have on the 857 doesn't support
The version I have is: c850-advsecurityk9-mz.123-8.YI2.bin.  Do you know
what version I need to support the pseudowire feature.



-----Original Message-----
From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com] 
Sent: 19 July 2006 11:53
To: Alex Foster; cisco-nas at puck.nether.net
Subject: RE: [cisco-nas] L2TP LAC to LNS

Alex Foster <> wrote on Wednesday, July 19, 2006 11:49 AM:

> Hi,
> Is it possible to unconditionally establish an l2tp tunnel between a
> LAC 
> and an LNS.  Im trying to do this with a Cisco 857 (call this the LAC)
> and a 7206 (call this the LNS).  The 857 has an established PPPoA
> session with an ADSL provider and I am trying to piggy-back the L2TP
> tunnel over this to an LNS on the public network.  There is no client
> connection initiating the L2TP tunnel (on the LAC) so I want the L2TP
> tunnel to establish unconditionally.  I have tried the following
> config on the 857 without success (Im happy with the config. on the
LNS).  Is
> this possible??

you should look at the client-initiated L2TP tunneling feature
_guide09186a00801a7592.html) which should do what you want on the 857..


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