[l2tpns-users] mlppp+intracom netmod

[Aleksandar Zakic <azakic@gm...>]

Hi,

I install l2tpns-2.2.0-head with mlppp patch. Mi ISDN pci card (Fritz B1)
with two line working corectli, but my intracom terminal adapter (netmod)
with integrated isdn modem disconnected 5-10s after connection . In
connection status PPP Multilink is off, on pci card PPP Multilink is on.
Terminal adapter is connected to PC over serial or USB cable.

Re: [l2tpns-users] LCP: ignoring ConfigReq in state Closing

[Tim Warnock <timoid@ge...>]

-----Original Message-----
>Can we get to the bottom of the problem if is a code problem, or
>can we code l2tpns to deal with this situation without requiring an
>external monitoring script?

I've never seen this occur on l2tpns, but I have with rp-l2tp. I wrote a
patch that immediately killed the session should this event occur. The
end user would then reauth successfully.

What needs to be determined is: is l2tpns not completing the tunnel
teardown because there is incoming data (and maybe resetting the tunnel
idle timer)?

>
>What are other peoples thoughts on this, please?
>

It sounds to me like a code problem and should be addressed there.

Thanks
Tim Warnock

ISP Technical Manager
getonit internet
1300 88 00 97
timoid (at) getonit.net.au

Re: [l2tpns-users] LCP: ignoring ConfigReq in state Closing

[<paul@cu...>]

On Thu, Apr 12, 2007 at 06:28:20PM +0200, Eden Akhavi wrote:
> We see this regularly; we only option we have to resolve it is drop the
> connection from the CLI.
> 
> I ended up writing a script to check the connections using expect and then
> drop the ones in hung state.
> 
> It would be nice to get a fix for this.

It sounds like lots of people are affected by this. An older thread
viewable on sf.net suggests that this problem tends to be related to
Netgear and D-Link CPEs - certainly we only see it with these -
customers with Belkin, Zyxel etc CPEs do not seem to be affected.

Not withstanding Mat's comments about fixing the real source of the
disconnections, I believe that this is scenario should be dealt with by
l2tpns - certainly the Cisco L2TP implemenation either deals with the
problem or doesn't have the problem.

Is everyone other than Mat dealing with this by writing their own
monitoring scripts? If so, should we pool efforts to have a single good
script? Can we get to the bottom of the problem if is a code problem, or
can we code l2tpns to deal with this situation without requiring an
external monitoring script?

What are other peoples thoughts on this, please?

Re: [l2tpns-users] LCP: ignoring ConfigReq in state Closing

[Mat Walker <mat@ma...>]

Paul,

We find this quite regularly.

The closest reason we could find for it happening, was particular users 
were disconnecting regularly (for numerous reasons) without correct 
session termination sequences occurring.

When the user disconnects, L2TPNS takes around 10seconds for it to 
detect the session is dead and takes some time to shut it down via cleanup.

L2TPNS starts its close down sequence, but during this time the users 
re-syncs, and tries to re authenticate. In most cases the users comes in 
via the same tunnel and session number, thus L2TPNS starts to receive 
"ConfigReq" for a session thats in Closing state.
This goes on forever until you drop the session manually via CLI.

We chose to more correct the issue with the customer rather than L2TPNS, 
and find out why the users was disconnecting un-cleanly, that is, 
without sending the correct disconnection notice for the PPP session 
shut down.

In most cases its either been a bad line, incorrect filter use or 
stuffed filter, faulty CPE, user just pulling the power on a USB CPE and 
not disconnecting the PPP session etc etc.

Not sure if this helps you or not, but it at least explains why it happens.

Mat

Paul Cupis wrote:
> [ re-sent to -users rather then devel ]
>
>  LCP: ignoring ConfigReq in state Closing
>
> Has anyone else seen the above error in their l2tpns logs? We have a
> user who's session will, after a while, start spewing this message into
> our log and they cannot pass any traffic. Dropping their session and
> allowing them to log back in and it works as before.
>
> Plenty of other users connected and they don't have this problem.
> Customer is using a Netgear DG834v3. If I connect them to a Cisco VXR I
> do not get this problem.
>
> This is using an L2TP feed for UK ADSL and l2tpns 2.1.21-1 on Debian 4.0
> 'etch'.
>
> Thanks in advance.
>
>
> -------------------------------------------------------------------------
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Re: [l2tpns-users] LCP: ignoring ConfigReq in state Closing

[Eden Akhavi <eden.akhavi@lt...>]

We see this regularly; we only option we have to resolve it is drop the
connection from the CLI.

I ended up writing a script to check the connections using expect and then
drop the ones in hung state.

It would be nice to get a fix for this.



> -----Original Message-----
> From: l2tpns-users-bounces@... 
> [mailto:l2tpns-users-bounces@...] On Behalf 
> Of Paul Cupis
> Sent: 12 April 2007 12:43
> To: l2tpns-users@...
> Subject: [l2tpns-users] LCP: ignoring ConfigReq in state Closing
> 
> [ re-sent to -users rather then devel ]
> 
>  LCP: ignoring ConfigReq in state Closing
> 
> Has anyone else seen the above error in their l2tpns logs? We 
> have a user who's session will, after a while, start spewing 
> this message into our log and they cannot pass any traffic. 
> Dropping their session and allowing them to log back in and 
> it works as before.
> 
> Plenty of other users connected and they don't have this problem.
> Customer is using a Netgear DG834v3. If I connect them to a 
> Cisco VXR I do not get this problem.
> 
> This is using an L2TP feed for UK ADSL and l2tpns 2.1.21-1 on 
> Debian 4.0 'etch'.
> 
> Thanks in advance.
> 
> 
> --------------------------------------------------------------
> -----------
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> SourceForge.net's Techsay panel and you'll get the chance to 
> share your opinions on IT & business topics through brief 
> surveys-and earn cash 
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&CID=DEVDEV
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> 

[l2tpns-users] LCP: ignoring ConfigReq in state Closing

[<paul@cu...>]

[ re-sent to -users rather then devel ]

 LCP: ignoring ConfigReq in state Closing

Has anyone else seen the above error in their l2tpns logs? We have a
user who's session will, after a while, start spewing this message into
our log and they cannot pass any traffic. Dropping their session and
allowing them to log back in and it works as before.

Plenty of other users connected and they don't have this problem.
Customer is using a Netgear DG834v3. If I connect them to a Cisco VXR I
do not get this problem.

This is using an L2TP feed for UK ADSL and l2tpns 2.1.21-1 on Debian 4.0
'etch'.

Thanks in advance.