Mailing List Archive: L2TP LAC to LNS

L2TP LAC to LNS

Jul 19, 2006, 2:49 AM

Post #1 of 3 (6496 views)

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??

vpdn enable
!
vpdn-group 1
! Default L2TP VPDN group
request-dialin
protocol l2tp
initiate-to ip x.x.x.x priority 1
!
interface ATM0
no ip address
no ip route-cache cef
no ip route-cache
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0.1 point-to-point
no ip route-cache
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
interface Vlan1
ip address 10.60.4.129 255.255.255.192
ip helper-address 10.50.32.32
ip nat inside
ip virtual-reassembly
!
interface Dialer0
ip address negotiated
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
no peer neighbor-route
no peer default ip address
no cdp enable
ppp authentication chap callin
ppp chap hostname xxxxxxxxx
ppp chap password 0 xxxxxxxxxx
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
!

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Re: L2TP LAC to LNS [ In reply to ]

oboehmer at cisco

Jul 19, 2006, 3:53 AM

Post #2 of 3 (6298 views)

Permalink

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
(http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature
_guide09186a00801a7592.html) which should do what you want on the 857..

oli

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Re: L2TP LAC to LNS [ In reply to ]

afoster at gammatelecom

Jul 19, 2006, 4:18 AM

Post #3 of 3 (6283 views)

Permalink

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
pseudowires.
The version I have is: c850-advsecurityk9-mz.123-8.YI2.bin. Do you know
what version I need to support the pseudowire feature.

Regards

Alex

-----Original Message-----
From: Oliver Boehmer (oboehmer) [mailto:oboehmer@cisco.com]
Sent: 19 July 2006 11:53
To: Alex Foster; cisco-nas@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
(http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature
_guide09186a00801a7592.html) which should do what you want on the 857..

oli

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The information in this e-mail and any attachments is confidential and may be subject to legal professional privilege. It is intended solely for the attention and use of the named addressee(s). If you are not the intended recipient, or person responsible for delivering this information to the intended recipient, please notify the sender immediately. Unless you are the intended recipient or his/her representative you are prohibited from, and therefore must not, read, copy, distribute, use or retain this message or any part of it. The views expressed in this e-mail may not represent those of Gamma Telecom.

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