What doens pppoe[3544]: Timeout waiting for PADO packets mean?

Hi all

I get the above error message in var/log/messages after using the adsl-setup
script on Rh9 Linux:

Jun 19 01:26:45 StefanLinux pppd[3637]: pppd 2.4.1 started by root, uid 0
Jun 19 01:26:45 StefanLinux pppd[3637]: Using interface ppp0
Jun 19 01:26:45 StefanLinux pppd[3637]: Connect: ppp0 <--> /dev/pts/4
Jun 19 01:26:45 StefanLinux /etc/hotplug/net.agent: assuming ppp0 is already
up
Jun 19 01:27:16 StefanLinux pppd[3637]: LCP: timeout sending Config-Requests
Jun 19 01:27:16 StefanLinux pppd[3637]: Connection terminated.
Jun 19 01:27:16 StefanLinux /etc/hotplug/net.agent: NET unregister event not
supported
Jun 19 01:27:20 StefanLinux pppoe[3638]: Timeout waiting for PADO packets
Jun 19 01:27:20 StefanLinux pppd[3637]: Exit.
Jun 19 01:27:20 StefanLinux adsl-connect: ADSL connection lost; attempting
re-connection.

My ADSL modem works fine in Windows - what is the "PAD0" packets error? How
can I fix it?

Thanks!
--
---
Stefan Viljoen
Software Support Technician
Polar Design Solutions

On Sat, 19 Jun 2004, Stefan Viljoen <rylan@-deletethis-intekom.co.za> wrote:
> Hi all
>
> I get the above error message in var/log/messages after using the adsl-setup
> script on Rh9 Linux:
>
> Jun 19 01:26:45 StefanLinux pppd[3637]: pppd 2.4.1 started by root, uid 0
> Jun 19 01:26:45 StefanLinux pppd[3637]: Using interface ppp0
> Jun 19 01:26:45 StefanLinux pppd[3637]: Connect: ppp0 <--> /dev/pts/4
> Jun 19 01:26:45 StefanLinux /etc/hotplug/net.agent: assuming ppp0 is already
> up
> Jun 19 01:27:16 StefanLinux pppd[3637]: LCP: timeout sending Config-Requests
> Jun 19 01:27:16 StefanLinux pppd[3637]: Connection terminated.
> Jun 19 01:27:16 StefanLinux /etc/hotplug/net.agent: NET unregister event not
> supported
> Jun 19 01:27:20 StefanLinux pppoe[3638]: Timeout waiting for PADO packets
> Jun 19 01:27:20 StefanLinux pppd[3637]: Exit.
> Jun 19 01:27:20 StefanLinux adsl-connect: ADSL connection lost; attempting
> re-connection.
>
> My ADSL modem works fine in Windows - what is the "PAD0" packets error? How
> can I fix it?

A web search for 'rfc pppoe' might explain this more completely. But I
believe that your PC would first send a PADI request, would receive PADO
and then supply authentication information using what it got from the PADO
response. Although I am using demand kernel pppoe (instead of rp-pppoe)
either uses pppd (my pppd is also 2.4.1). Mine first sets up a dummy
route for the demand connection and when it gets traffic initiating a
connection, that part goes something like this:

May 25 22:15:25 realhost pppd[940]: Starting link
May 25 22:15:25 realhost pppd[940]: Sending PADI
May 25 22:15:25 realhost pppd[940]: HOST_UNIQ successful match
May 25 22:15:25 realhost pppd[940]: HOST_UNIQ successful match
May 25 22:15:25 realhost pppd[940]: Got connection: 191f
May 25 22:15:25 realhost pppd[940]: Connecting PPPoE socket:
00:10:67:00:f9:18 1f19 eth1 0x808a630
May 25 22:15:25 realhost pppd[940]: Connect: ppp0 <--> eth1
May 25 22:15:25 realhost pppd[940]: Setting MTU to 1492.
May 25 22:15:25 realhost pppd[940]: Couldn't increase MRU to 1500
May 25 22:15:25 realhost pppd[940]: Setting MTU to 1492.
May 25 22:15:27 realhost pppd[940]: Local IP address changed to
68.20.x.226
May 25 22:15:27 realhost pppd[940]: Remote IP address changed to
68.20.y.254

Notice that mine shows Connect: ppp0 <--> eth1 (the ethernet to my pppoe
modem) and yours shows Connect: ppp0 <--> /dev/pts/4, but /dev/pts usually
refers to terminals. So I wonder if pppd is attempting to use your
terminal instead of ethernet to modem. Or maybe rp-pppoe does it
differently through a psuedo terminal for interactive hooks to monitor
things (like pppoe transmission speeds).

Whatever the case, whatever interface pppd is attempting to use is not
returning a PADO response or responding to LCP requests for pppoe.

--
David Efflandt - All spam ignored http://www.de-srv.com/

David Efflandt wrote:

> On Sat, 19 Jun 2004, Stefan Viljoen <rylan@-deletethis-intekom.co.za>
> wrote:
>> Hi all
>>
>> I get the above error message in var/log/messages after using the
>> adsl-setup script on Rh9 Linux:
>>

>> My ADSL modem works fine in Windows - what is the "PAD0" packets error?
>> How can I fix it?
>
> A web search for 'rfc pppoe' might explain this more completely. But I
> believe that your PC would first send a PADI request, would receive PADO
> and then supply authentication information using what it got from the PADO
> response. Although I am using demand kernel pppoe (instead of rp-pppoe)
> either uses pppd (my pppd is also 2.4.1). Mine first sets up a dummy
> route for the demand connection and when it gets traffic initiating a
> connection, that part goes something like this:

Hi David! Thanks for the reply. Any idea how it sets up this dummy
connection to do LCP negotiation?

Everything works fine in Windows as regards ADSL surfing (on physically same
machine - I dual boot) so I guess hardware is ok...

Thanks for the reply,

--
---
Stefan Viljoen
Software Support Technician
Polar Design Solutions

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In comp.os.linux.networking Stefan Viljoen <rylan@-deletethis-intekom.co.za> suggested:
> Hi all

> I get the above error message in var/log/messages after using the adsl-setup
> script on Rh9 Linux:

> Jun 19 01:26:45 StefanLinux pppd[3637]: pppd 2.4.1 started by root, uid 0
> Jun 19 01:26:45 StefanLinux pppd[3637]: Using interface ppp0
[..]
> Jun 19 01:27:20 StefanLinux pppoe[3638]: Timeout waiting for PADO packets
[..]

> My ADSL modem works fine in Windows - what is the "PAD0" packets error? How
> can I fix it?

PADO == PPPoE Active Discovery Offer

If I get this, it usually means there's some problem on my ISP
side, albeit if it works for you with M$, it's probably a
misconfiguration on your side, perhaps MTU settings? Hard to
tell, perhaps a google search for you ISP/Linux could offer some
more hints if there's something missing.

--
Michael Heiming (GPG-Key ID: 0xEDD27B94)
mail: echo (E-Mail Removed) | perl -pe 'y/a-z/n-za-m/'
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Michael Heiming wrote:

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>
> In comp.os.linux.networking Stefan Viljoen
> <rylan@-deletethis-intekom.co.za> suggested:
>> Hi all
>
>> I get the above error message in var/log/messages after using the
>> adsl-setup script on Rh9 Linux:
>
>> Jun 19 01:26:45 StefanLinux pppd[3637]: pppd 2.4.1 started by root, uid 0
>> Jun 19 01:26:45 StefanLinux pppd[3637]: Using interface ppp0
> [..]
>> Jun 19 01:27:20 StefanLinux pppoe[3638]: Timeout waiting for PADO packets
> [..]
>
>> My ADSL modem works fine in Windows - what is the "PAD0" packets error?
>> How can I fix it?
>
> PADO == PPPoE Active Discovery Offer
>
> If I get this, it usually means there's some problem on my ISP
> side, albeit if it works for you with M$, it's probably a
> misconfiguration on your side, perhaps MTU settings? Hard to
> tell, perhaps a google search for you ISP/Linux could offer some
> more hints if there's something missing.

Thanks for replying, Michael!

Any idea how or where I can change MTU settings? Is it an adjustment done on
the PC side or at the router/POTS modem itself?

Thanks!



--
---
Stefan Viljoen
Software Support Technician
Polar Design Solutions

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In comp.os.linux.networking Stefan Viljoen <rylan@-deletethis-intekom.co.za> suggested:
> Michael Heiming wrote:
>> In comp.os.linux.networking Stefan Viljoen
>> <rylan@-deletethis-intekom.co.za> suggested:
[..]

> Any idea how or where I can change MTU settings? Is it an adjustment done on
> the PC side or at the router/POTS modem itself?

That was just a random guess, since it's common with pppoe
problems. I don't know your setup, I have these lines in
/etc/ppp/options:

mru 1492
mtu 1492

But then I'm using the kernel pppoe module and this setting is
specific to my ISP. Bets idea would be looking/searching for
suggestions on your ISP regarding Linux/pppoe or even asking him.

--
Michael Heiming (GPG-Key ID: 0xEDD27B94)
mail: echo (E-Mail Removed) | perl -pe 'y/a-z/n-za-m/'
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David Efflandt <(E-Mail Removed)> wrote:
> May 25 22:15:25 realhost pppd[940]: Connect: ppp0 <--> eth1
> May 25 22:15:25 realhost pppd[940]: Setting MTU to 1492.
> May 25 22:15:25 realhost pppd[940]: Couldn't increase MRU to 1500
> May 25 22:15:25 realhost pppd[940]: Setting MTU to 1492.
> May 25 22:15:27 realhost pppd[940]: Local IP address changed to
> 68.20.x.226
> May 25 22:15:27 realhost pppd[940]: Remote IP address changed to
> 68.20.y.254

> Notice that mine shows Connect: ppp0 <--> eth1 (the ethernet to my pppoe
> modem) and yours shows Connect: ppp0 <--> /dev/pts/4, but /dev/pts usually
> refers to terminals. So I wonder if pppd is attempting to use your
> terminal instead of ethernet to modem.

I experienced this behavior (ppp0 <--> /dev/pts/N) briefly while
floundering around to make the transition to the 2.6.x kernel series.
Still, pppd worked okay with my regular POTS PPP connection which
specifies /dev/ttyS1.

> Whatever the case, whatever interface pppd is attempting to use is not
> returning a PADO response or responding to LCP requests for pppoe.

Yes, and pppd should not start before the PPP0E Active Discovery phase
is completed, unless pppd itself does the PAD as in kernel-mode PPPoE.
If the OP expects pppd to do PAD then he should read KERNEL-MODE-PPPOE,
which is in the top directory of pppd's source. If he is using rp-pppoe
then he should read README.pppoe in that directory.

--
Clifford Kite Email: "echo xvgr_yvahk-(E-Mail Removed)|rot13"
PPP-Q&A links, downloads: http://ckite.no-ip.net/

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In comp.os.linux.networking Clifford Kite <(E-Mail Removed)> suggested:
> David Efflandt <(E-Mail Removed)> wrote:
[..]

>> Notice that mine shows Connect: ppp0 <--> eth1 (the ethernet to my pppoe
>> modem) and yours shows Connect: ppp0 <--> /dev/pts/4, but /dev/pts usually
>> refers to terminals. So I wonder if pppd is attempting to use your
>> terminal instead of ethernet to modem.

> I experienced this behavior (ppp0 <--> /dev/pts/N) briefly while
> floundering around to make the transition to the 2.6.x kernel series.
> Still, pppd worked okay with my regular POTS PPP connection which
> specifies /dev/ttyS1.

Hadn't any problems with pppd while moving to kernel 2.6, but
this seems to be the reason for the problems, mine shows of
course:
Connect: ppp0 <--> eth0

--
Michael Heiming (GPG-Key ID: 0xEDD27B94)
mail: echo (E-Mail Removed) | perl -pe 'y/a-z/n-za-m/'
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Michael Heiming <michael+(E-Mail Removed)> wrote:
> In comp.os.linux.networking Clifford Kite <(E-Mail Removed)>
> suggested:

>> I experienced this behavior (ppp0 <--> /dev/pts/N) briefly while
>> floundering around to make the transition to the 2.6.x kernel series.
>> Still, pppd worked okay with my regular POTS PPP connection which
>> specifies /dev/ttyS1.

> Hadn't any problems with pppd while moving to kernel 2.6, but
> this seems to be the reason for the problems, mine shows of
> course:
> Connect: ppp0 <--> eth0

Perhaps that was badly worded. What I meant to say was at one point I
had seen ppp0 <--> /dev/pts/<N> even while still specifying /dev/ttyS1
for pppd, but PPP worked anyway. The 2.6 kernel compiled as per the final
configuration reverted to Connect: ppp0 <--> /dev/ttyS1. I believe the
difference was caused by configuring CONFIG_LEGACY_PTYS as opposed to
CONFIG_UNIX98_PTYS. The xterms, or rather rxvt terms here, show up as
/dev/pts/<N> for both configurations.

--
Clifford Kite Email: "echo xvgr_yvahk-(E-Mail Removed)|rot13"
PPP-Q&A links, downloads: http://ckite.no-ip.net/