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Pieter Loubser | 3 May 11:46

VJCOMP Issue with Siemens MC75


Hi,

I have a problem when using the GSM/GPRS/EDGE Siemens MC75 module
with PPP (version 2.4.2).

LCP comes up fine and authentication succeed, but while negotiating
IPCP, the VJ compression keeps failing.

<snip>

sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>
     <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01> <compress VJ 0f 01>]
Received bad configure-nak/rej:  02 06 00 2d 0f 01 02 06 00 2d 0f 01

rcvd [IPCP ConfReq id=0x1 <addr 10.0.0.1>]
sent [IPCP ConfAck id=0x1 <addr 10.0.0.1>]
sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>
     <ms-dns10.0.0.0> <ms-dns3 0.0.0.0>]
rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01> <compress VJ 0f 01>]
Received bad configure-nak/rej:  02 06 00 2d 0f 01 02 06 00 2d 0f 01

sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>
     <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01> <compress VJ 0f 01>]
Received bad configure-nak/rej:  02 06 00 2d 0f 01 02 06 00 2d 0f 01

<snip>
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James Carlson | 3 May 14:45

Re: VJCOMP Issue with Siemens MC75

Pieter Loubser writes:
> I think its because when the Siemens replies with the confrej, it
> rejects the vjcomp twice in the same message.

Yes.  The peer is broken.

> It does work if I disable the VJ comp in PPP with "novj" and
> "novjccomp". But I would like not to, for vjcomp is supported  on some
> other GPRS/EDGE modules and this is a generic setup. Anyway it should
> just reject it correctly and continue. The Siemens MC55 module (the
> MC75's predecessor) works fine, and rejects vjcomp properly.

Sometimes, there's little you can do but choose between tweaking your
configuration for a particularly broken peer, or just avoiding that
device in the hope that the manufacturer will fix it.

You could hack the code (you have source, after all), but I doubt that
it'd be good to have the main line of pppd damaged to accomodate this
confused system.

--

-- 
James Carlson         42.703N 71.076W         <carlsonj <at> workingcode.com>
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何普江 | 5 May 05:20
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LCP terminated by peer?

I use pppd and find sometimes the connection is closed by server, how can i fix
it? following is the print info, thanks!

pppd options in effect:
debug           # (from command line)
kdebug 0                # (from command line)
-detach         # (from command line)
dump            # (from command line)
lock            # (from command line)
connect /usr/ppp-on-dialer              # (from command line)
disconnect /usr/ppp-off-command         # (from command line)
escape ff               # (from command line)
asyncmap 20a0000                # (from command line)
noipdefault             # (from command line)
defaultroute            # (from command line)
netmask 255.255.255.0           # (from command line)
:               # (from command line)
Serial connection established.
using channel 7
Using interface ppp0
Connect: ppp0 <--> /dev/ttyS1
mtu = 1500, accm = 4294967295, pcomp = 0, accomp = 0
tty_recv_config: mru = 1500, asyncmap = 4294967295, pcomp = 1, accomp = 1
sent [LCP ConfReq id=0x1 <asyncmap 0x20a0000> <magic 0x5d93a4c4> <pcomp>
<accomp>]
rcvd 24
rcvd [LCP ConfAck id=0x1 <asyncmap 0x20a0000> <magic 0x5d93a4c4> <pcomp>
<accomp>]
rcvd 29
rcvd [LCP ConfReq id=0x3 <asyncmap 0xa0000> <pcomp> <accomp> <magic 0x93cecf54>
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johnson okorocha | 13 May 14:55
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payment.

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to send the amount to you without any delay.

With best regards,

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______________________________________
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http://ad.tiscali.com/adclick/CID=0002ceb4c6efdc0e00000000/SITE=CZ.TISCALI/AREA=NEWSLETTER..HOME/POS=L2
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JOBY THAMPAN | 23 May 08:45

(unknown)

Hi all,

	When I made DHCP Relay listening on a machine containing PPP
Interface, the DHCP Relay is not recieving the offer packet from dhcp server

	But when I made DHCP Relay listening on ethernet interface on a
different machine other than the machine containing PPP Interface DHCP Offer
Successfully recieved.

	If somebody knows, Please explain why this is so???

Rgds
joby

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Bill Unruh | 23 May 18:01
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DHCP failure on machine with ppp running.

On Tue, 23 May 2006, JOBY THAMPAN wrote:

> Hi all,
>
> 	When I made DHCP Relay listening on a machine containing PPP
> Interface, the DHCP Relay is not recieving the offer packet from dhcp server

Sounds like your routing is messed up. I do not knw what you mean  in your
description of the problem however. Your machine contains both a ppp and an
eth0 interface? and you want it to set up dhcp on eth0? How do you go about
it?

Also please use subjects to your emails and do NOT use all capitals in your
name. both are typical of spam and your email almost certainly got tossed
out from almost everyone in this group as spam.

>
> 	But when I made DHCP Relay listening on ethernet interface on a
> different machine other than the machine containing PPP Interface DHCP Offer
> Successfully recieved.
>
> 	If somebody knows, Please explain why this is so???
>
> Rgds
> joby
>
>
> ---------------------------------------------------------------------------
>       "This e-mail and any files transmitted with it are for the sole use
> of the intended recipient(s) and may contain confidential and privileged
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JOBY THAMPAN | 24 May 07:48

RE: DHCP failure on machine with ppp running.


Hi,

	This is company mail ID, so it is not easy to change the Format of
mail ID. Sorry for any inconvenience.

	I am attaching the setup diagram... (Setup-sha)

	Explanation:
	
	DHCP Server running on Linux machine 1 on 192.168.10.1

	DHCP Relay started with Server IP as 192.168.10.1 and listening on
ppp0. and eth1.
 	Link 2 is PPPoE link.

	The client is expecting an IP in the range 192.168.40.X

	But the DHCP Offer packet from Server is reaching only upto PPPoE
Client interface...

	Then I did a setup like placing another machine between the client
machine and pppoe-client machine

	and started dhcprelay on that machine which listens on eth
interface.

	as shown in the attachment (Setup-jo).

	This worked..
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Bill Unruh | 24 May 08:14
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RE: DHCP failure on machine with ppp running.

On Wed, 24 May 2006, JOBY THAMPAN wrote:

>
> Hi,
>
> 	This is company mail ID, so it is not easy to change the Format of
> mail ID. Sorry for any inconvenience.
>
> 	I am attaching the setup diagram... (Setup-sha)
>
> 	Explanation:
>
> 	DHCP Server running on Linux machine 1 on 192.168.10.1
>
> 	DHCP Relay started with Server IP as 192.168.10.1 and listening on
> ppp0. and eth1.

Do you mean 192.168.10.200?
and 192.168.20.1

> 	Link 2 is PPPoE link.

Why? PPPoE is ppp over ethernet. If you already have an ethernet link, why
in the world would you then want to have ppp running on top of that? pppoe
was and abortion which had life breathed into it by a commercail company
for no reason but to make money. It is used as a way of doing
authentication , but you have a single machine (#3) hanging off #2.
Strange.

>
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Gmane