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<title>Re: [rbak-nsp] Cisco AS5300 L2TP forwarding to Redback SmartEdge</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Frans,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I’m not clear on how to check what
PPP parameters are being used by each device; nothing like MRRU is explicitly
configured; should I be looking in any particular debug output for this?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>A fragment of the debug output from the
Redback is below; it suggests an issue with authentication although I may just
be miss-interpreting it. I’m unclear as to why the subscriber
cannot be bound to the context which exists and is able to terminate DSL
subscribers forwarded to it from other Redback SEs. RADIUS configuration is
also exactly the same for the LNS as it is when terminating DSL forwarded
subscribers. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-SESFSM:
sp_lac:9231:8074 FSM event LNS-READY [Wait-LNS-ready -> Wait-ICCN]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPA: Unpacking
messages from PPA, total length:28, msg type len:28<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPA: Received
SESSION_BIND msg #1 from PPA, remaining len:0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPA: Received
bind from L2TP SLOT 01/0 for circuit 255/16:1023:63/5/2/1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPA: Unpacking
messages from PPA, total length:28, msg type len:28<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPA: Received
SESSION_BIND msg #1 from PPA, remaining len:0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPA: Received
bind from L2TP SLOT 01/1 for circuit 255/16:1023:63/5/2/1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-ISM:
255/16:1023:63/5/2/1: no aaa_index<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-ISM: L2TP-cfg
255/16:1023:63/5/2/1 [PPP] [SB] LNS L:9231/8074 Rs:13<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PKT: RX
sp_lac:9231 <3:2> ICCN L:150 T:9231 S:8074<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-AVP:
M Len= 2 IETF Message-Type=ICCN<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-AVP:
M Len= 4 IETF TX-Connect-Speed=44000<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: Len= 4 IETF Rx-Connect-Speed=28800<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=SV
style='font-size:10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: M Len= 4 IETF Framing-Type=Async <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: Len=20 IETF Last-TX-ConfReq=0206000a00000304c02305067fd09d7e07020802<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: Len=16 IETF
Last-RX-ConfReq=020600000000050631b44f3c07020802<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: Len= 2 IETF Proxy-Authen-ID=33<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=SV
style='font-size:10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: Len=16 IETF Proxy-Authen-Name=<user>@zen.net.uk<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: Len= 8 IETF Proxy-Authen-Response=<password
removed><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: Len= 2 IETF Proxy-Authen-Type=PAP<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-SES:
sp_lac:9231:8074 Received ICCN<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-AAA: sp_lac:9231:8074:
tx speed: 44000 rx speed: 28800<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-SESFSM: Running
SES event RECV_ICCN on sp_lac:9231:8074<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-ISM:
sp_lac:9231:8074 ism ses state change state: Established<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-SESFSM:
sp_lac:9231:8074 FSM event RECV_ICCN [Wait-ICCN -> Established]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPP: Starting LNS
PPP session for sp_lac:9231:8074<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPP: RenegMRU: 0
FragMru: 2 RenegLCP: 1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-WINDOW:
sp_lac:9231 Sending ZLB ack Ns=2 Nr=4<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PKT: TX
sp_lac:9231 <2:4> ZLB L:12 T:11198 S:0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-ISM:
sp_lac:9231:8074 ism ses state change state: Established<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPA: FWD
Processing tun sp_lac:9231 in state Established (chg: 4)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPA: PPA already
up to date for sp_lac:9231<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPP: Peer ACCM
received : 0 0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PPP: OUR ACCM
received : a0000<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-SES:
sp_lac:9231:8074 Sending SLI, Tx ACCM: 00000000 Rx ACCM: 0x000a0000<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PKT: TX
sp_lac:9231 <2:4> SLI L:36 T:11198 S:13<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=DA
style='font-size:10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19:
%L2TP-7-AVP: M Len= 2 IETF Message-Type=SLI<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-AVP:
M Len=10 IETF ACCM=000000000000000a0000<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:19: %L2TP-7-PKT: RX
sp_lac:9231 <4:3> ZLB L:12 T:9231 S:0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: [255/16:1023:63/5/2/1]:
%AAA-7-EXCEPT: aaa_idx 10000002: Cannot bind subscriber <user>@zen.net.uk
to valid context<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: [255/16:1023:63/5/2/1]:
%AAA-3-ERR: aaa_idx 10000002: Can't find pvd_idx ffffffff<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: [255/16:1023:63/5/2/1]:
%AAA-7-EXCEPT: aaa_idx 10000002: aaa_remove_session_from_trees: remove session
that is not bound to any context yet<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-ISM:
255/16:1023:63/5/2/1: no aaa_index<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-ISM: L2TP-cfg
255/16:1023:63/5/2/1 [PPP] [SB] LNS L:9231/8074 Rs:13<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-ISM: SUB down
cplt 255/16:1023:63/5/2/1 tc:24 (ses)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-PKT: TX
sp_lac:9231 <3:4> CDN L:93 T:11198 S:13<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-AVP:
M Len= 2 IETF Message-Type=CDN<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-AVP:
M Len= 2 IETF Assigned-Session-ID=8074<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20:
%L2TP-7-AVP: Len=27 IETF PPP-Disc-Cause=16:C223:1
Authentication failure<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-AVP:
M Len=26 IETF Result-Code=(2,6):Authentication failure<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-SESABORT:
sp_lac:9231:8074 local abort: Authentication failure (tc 24)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-SESFSM: Running
SES event LOCAL_CLOSE on sp_lac:9231:8074<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mar 12 15:02:20: %L2TP-7-SESFSM:
sp_lac:9231:8074 FSM event LOCAL_CLOSE [Established -> Idle]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The initial purpose of my post was to try
and establish if anyone has tried L2TP forwarding dialup users from an AS5300
to a SE and gauge if it is worth putting effort into trying to make it work. If
however anyone can point out anything simple that I may be missing based on the
above information it would be much appreciated.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Carl<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
redback-nsp-bounces@puck.nether.net
[mailto:redback-nsp-bounces@puck.nether.net] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Frans Legdeur<br>
<b><span style='font-weight:bold'>Sent:</span></b> 15 March 2010 15:27<br>
<b><span style='font-weight:bold'>To:</span></b> Carl Simpson;
redback-nsp@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [rbak-nsp] Cisco
AS5300 L2TP forwarding to Redback SmartEdge</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Calibri><span
style='font-size:11.0pt;font-family:Calibri'>Hi Carl,<br>
<br>
Have you tried:<br>
Debug aaa authen<br>
Debug aaa author<br>
Debug aaa rad-attr<br>
<br>
Watch the output closely, you might see some attributes failing to find a place
to hook them on.<br>
Be aware that the SE400 doesn’t support compression algorithms.<br>
Another caveat is that the first negotiation is done between client and AS5300,
and secondly is done between client and SE400.<br>
If these have different parameters for PPP, like MRRU, the client might expect
a man-in-the-middle attack and close connection directly.<br>
Keep all negotiated info between AS5300 and SE400 the same, else debug PPP
negotiation to see where it fails on ...<br>
<br>
Kind regards,<br>
<br>
<br>
Frans.<br>
<br>
<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;font-weight:bold'>From: </span></font></b><font
size=2 face=Calibri><span style='font-size:11.0pt;font-family:Calibri'>Carl
Simpson <<a href="carl.simpson@zeninternet.co.uk">carl.simpson@zeninternet.co.uk</a>><br>
<b><span style='font-weight:bold'>Date: </span></b>Mon, 15 Mar 2010 14:56:59
+0000<br>
<b><span style='font-weight:bold'>To: </span></b><<a
href="redback-nsp@puck.nether.net">redback-nsp@puck.nether.net</a>><br>
<b><span style='font-weight:bold'>Subject: </span></b>[rbak-nsp] Cisco AS5300
L2TP forwarding to Redback SmartEdge<br>
<br>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Hi All,<br>
<br>
I'm trying to dial in to a Cisco AS5300 and have it L2TP forward the PPP
session to a context on a Redback Smart Edge for termination.<br>
<br>
Dialup modem ---> AS5300(LAC) ---> SE400 (LNS)<br>
<br>
Does anyone know if this is possible or have any experience (successful or
unsuccessful) of doing this?<br>
<br>
I've got as far as the AS5300 seemingly bringing up the L2TP tunnel
successfully but the SE fails to terminate dialup users PPP session in the
context specified by RADIUS.<br>
<br>
I can provide debug/log message if anyone can help.<br>
<br>
Thanks,<br>
<br>
Carl<br>
<br>
</span></font><font size=2 face=Arial><span style='font-size:11.0pt;font-family:
Arial'><br>
-- <br>
Carl Simpson<br>
Senior Network Engineer, Zen Internet<br>
T: 0845 058 9168<br>
F: 0845 058 9005<br>
W: <a href="http://www.zen.co.uk">http://www.zen.co.uk</a> <<a
href="http://www.zen.co.uk/">http://www.zen.co.uk/</a>> <br>
<br>
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<br>
<br>
</span></font><font size=2 face=Calibri><span style='font-size:11.0pt;
font-family:Calibri'><o:p></o:p></span></font></p>
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