Using PPP networking under Linux

Paull & Williamson Solicitors | 1 Jun 2010 10:34

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Ben McKeegan | 1 Jun 2010 13:18

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Re: [Patch] fix packet loss and massive ping spikes with PPP multi-link

Richard Hartmann wrote:

> As 2.6.35-rc1 is out, does this mean that we are looking at 2.6.36 at the
> earliest? Or could this make it in as it is
> 
> a) a bug fix

This isn't really a bug fix.  Its a behavioural change to work around 
poor quality/mismatched underlying PPP channels.

Regards,
Ben.
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Richard Hartmann | 1 Jun 2010 13:28

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Re: [Patch] fix packet loss and massive ping spikes with PPP multi-link

On Tue, Jun 1, 2010 at 13:18, Ben McKeegan <ben <at> netservers.co.uk> wrote:

> This isn't really a bug fix.  Its a behavioural change to work around poor
> quality/mismatched underlying PPP channels.

Maybe not a bug in the Linux kernel itself, but certainly in the real world
that exists around Linux. Similar to how a change to a device driver that
is needed to work around broken hardware is a bug fix, imo.

RIchard
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arun b | 1 Jun 2010 16:54

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PPPoA server setup how to?

All,
How to we test PPPoA using pppd deemon...
I mean to understand the remote-server setup ?
what devie has the pppoa server and  how is the iintial hannd shake ?
 does this go with sequence of PADI, PADO,PADS .....etc... sequec?
please  respond.
Regs,
Arun
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James Carlson | 1 Jun 2010 17:10

Re: PPPoA server setup how to?

arun b wrote:
> All,
> How to we test PPPoA using pppd deemon...
> I mean to understand the remote-server setup ?
> what devie has the pppoa server and  how is the iintial hannd shake ?
>  does this go with sequence of PADI, PADO,PADS .....etc... sequec?

Are you looking for PPPoA or PPPoE?  What hardware do you have?

PPP over ATM just uses ATM-related drivers and runs regular PPP.

PPPoE is quite different.  It runs over Ethernet and uses a separate
protocol to set up the point-to-point virtual link.  The messages you're
referring to (PADI, and so on) are parts of the PPPoE protocol.

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David Miller | 2 Jun 2010 00:15

Re: [Patch] fix packet loss and massive ping spikes with PPP multi-link

From: Richard Hartmann <richih.mailinglist <at> gmail.com>
Date: Tue, 1 Jun 2010 13:28:59 +0200

> Maybe not a bug in the Linux kernel itself, but certainly in the real world
> that exists around Linux. Similar to how a change to a device driver that
> is needed to work around broken hardware is a bug fix, imo.

It's not the same situation at all.

It is easier to fix misconfigured products that exist because of
software and configurations than it is to fix a physical piece of
hardware.

So you could work around it if you wanted to.

I definitely don't see this as -stable material, as a result.  We will
push it to net-next-2.6 and it will thus hit 2.6.36 as previously
mentioned.
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arun b | 2 Jun 2010 09:46

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Re: PPPoA server setup how to?

On Tue, Jun 1, 2010 at 8:40 PM, James Carlson <carlsonj <at> workingcode.com> wrote:
> arun b wrote:
>> All,
>> How to we test PPPoA using pppd deemon...
>> I mean to understand the remote-server setup ?
>> what devie has the pppoa server and  how is the iintial hannd shake ?
>>  does this go with sequence of PADI, PADO,PADS .....etc... sequec?
>
> Are you looking for PPPoA or PPPoE?  What hardware do you have?
>
> PPP over ATM just uses ATM-related drivers and runs regular PPP.
>
> PPPoE is quite different.  It runs over Ethernet and uses a separate
> protocol to set up the point-to-point virtual link.  The messages you're
> referring to (PADI, and so on) are parts of the PPPoE protocol.
>
> --

Hi James,
Thanks for the info ..
Well I am looking for PPPoA explicitly, which basically uses
pppoatm.ko-driver module and pppoatm.so-lib along with pppd-deamon.
As explained above is being my client setup which I execute on, Now my
trouble/doubts is How/where to run PPPoA-server and on what device, Is
there a standard device/software available (Such as DSLAM, ISAM..etc).
Which can respond to the PPPoA-client (linux-box) packet and establish
the ppp-interface.

Pls do let me know any possible info related to this. Secondly also
any means of server configuration details.

(Continue reading)

James Chapman | 2 Jun 2010 11:26

Re: PPPoA server setup how to?

arun b wrote:
> On Tue, Jun 1, 2010 at 8:40 PM, James Carlson <carlsonj <at> workingcode.com> wrote:
>> arun b wrote:
>>> All,
>>> How to we test PPPoA using pppd deemon...
>>> I mean to understand the remote-server setup ?
>>> what devie has the pppoa server and  how is the iintial hannd shake ?
>>>  does this go with sequence of PADI, PADO,PADS .....etc... sequec?
>> Are you looking for PPPoA or PPPoE?  What hardware do you have?
>>
>> PPP over ATM just uses ATM-related drivers and runs regular PPP.
>>
>> PPPoE is quite different.  It runs over Ethernet and uses a separate
>> protocol to set up the point-to-point virtual link.  The messages you're
>> referring to (PADI, and so on) are parts of the PPPoE protocol.
>>
>> --
> 
> Hi James,
> Thanks for the info ..
> Well I am looking for PPPoA explicitly, which basically uses
> pppoatm.ko-driver module and pppoatm.so-lib along with pppd-deamon.
> As explained above is being my client setup which I execute on, Now my
> trouble/doubts is How/where to run PPPoA-server and on what device, Is
> there a standard device/software available (Such as DSLAM, ISAM..etc).
> Which can respond to the PPPoA-client (linux-box) packet and establish
> the ppp-interface.

As James said previously, for PPPoA there is no additional setup
protocol, so there is no PPPoA server. You just start pppd with

(Continue reading)

James Carlson | 2 Jun 2010 12:57

Re: PPPoA server setup how to?

On 06/02/10 05:26, James Chapman wrote:
> starts a pppd instance on ATM VPI 0, VCI 80 and assigns IP 192.168.1.1
> to the local interface and 192.168.1.2 to the peer when the PPPoA peer
> connects on VPI 0, VCI 80. If you are building a DSLAM-like box which
> accepts connections from many PPPoA clients, you will need to start a
> pppd instance for every possible ATM VPI/VCI that clients might use...

That's one possibility.  Another would be having UNI Q.2931 signaling
set up the virtual circuit for you, and launching pppd based on the
signaling.

I don't think the existing implementation includes the bits required to
do that.  You'd have to write it yourself.  And it (obviously) depends
on what sort of connection you have to the network.

>> Well I coated this (PADI, PADO,...) because, wanted to know does PPPoA
>> also follows these message sequence or it has new set of sequence ?
> 
> No, they are for PPPoE.

The closest equivalent to those messages I can imagine would be the ATM
signaling mechanism referenced above.

But I think it's probably time to take a step back and ask the obvious
question: can you tell us what you've got (in terms of hardware,
software, and operational environment) and what you're trying to do (in
as much high-level detail as possible)?

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(Continue reading)

AkashB | 2 Jun 2010 12:58

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How to increase TCP windows Size in PPP connection


Hi,

I have created a MLPPP connection using pppd(s).My PPP config file is as
follow:-

    defaultroute
    asyncmap 0
    sync
    lcp-echo-interval 1
    lcp-echo-failure 11

    nobsdcomp
    nodeflate
    nopcomp
    novj
    novjccomp
    noaccomp -am

    multilink
    passive
    ipcp-max-configure 7
    nodetach
    debug
    kdebug 31

Interface:
ppp0    Link encap:Point-to-Point Protocol
          inet addr:192.168.0.22  P-t-P:192.168.0.21  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:300  Metric:1

(Continue reading)

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