2002-08-06 17:41:59

by Diego Calleja

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Subject: pppd[32497]: Unsupported protocol 'CallBack Control Protocol (CBCP)' (0xc029) received

In different kernels I've seen this message:

Aug 6 19:10:01 localhost pppd[32497]: Unsupported protocol 'CallBack
Control Protocol (CBCP)' (0xc029) received


Is pppd who has to handle this protocol, or it's a "ToDo" in ppp in the
kernel? In the last case, will it be implemented?

and, what's the hell is the "Callback Protocol?"


2002-08-06 19:23:40

by Richard B. Johnson

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Subject: Re: pppd[32497]: Unsupported protocol 'CallBack Control Protocol (CBCP)' (0xc029) received

On Tue, 6 Aug 2002, Diego Calleja wrote:

> In different kernels I've seen this message:
>
> Aug 6 19:10:01 localhost pppd[32497]: Unsupported protocol 'CallBack
> Control Protocol (CBCP)' (0xc029) received
>
>
> Is pppd who has to handle this protocol, or it's a "ToDo" in ppp in the
> kernel? In the last case, will it be implemented?
>
> and, what's the hell is the "Callback Protocol?"

You are connected to a M$ 'server' and it's trying to interrogate
your machine with 'Magic Lantern'. I don't think you want it
implemented. From what I hear, it's what the US Government decided
that M$ must put into everything so that any 'Duly authorized....'
can peer into your computer.

Check it out. Scary...


Cheers,
Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
The US military has given us many words, FUBAR, SNAFU, now ENRON.
Yes, top management were graduates of West Point and Annapolis.

2002-08-06 19:59:56

by Randy.Dunlap

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Subject: Re: pppd[32497]: Unsupported protocol 'CallBack Control Protocol (CBCP)' (0xc029) received

On Tue, 6 Aug 2002, Richard B. Johnson wrote:

| On Tue, 6 Aug 2002, Diego Calleja wrote:
|
| > In different kernels I've seen this message:
| >
| > Aug 6 19:10:01 localhost pppd[32497]: Unsupported protocol 'CallBack
| > Control Protocol (CBCP)' (0xc029) received
| >
| > Is pppd who has to handle this protocol, or it's a "ToDo" in ppp in the
| > kernel? In the last case, will it be implemented?
| >
| > and, what's the hell is the "Callback Protocol?"
|
| You are connected to a M$ 'server' and it's trying to interrogate
| your machine with 'Magic Lantern'. I don't think you want it
| implemented. From what I hear, it's what the US Government decided
| that M$ must put into everything so that any 'Duly authorized....'
| can peer into your computer.
|
| Check it out. Scary...

I've never heard this explanation, but who knows??

I've heard of callback relating to RAS as a method of preventing
just anyone calling into a particlar RAS server.
Using callbacks, the server hangs up and immediately calls the
originator back to a valid, known telephone number.
Also allows the server to be billed for it instead of the caller.

At MS web site:
<quote>
Callback Negotiation with the Callback Control Protocol
The Callback Control Protocol (CBCP) is documented in
ftp://ftp.microsoft.com/developr/rfc/cbcp.txt .
CBCP negotiates the use of callback where the remote access server,
after authenticating the remote access client, terminates the physical
connection, waits a specified amount of time, and then calls the remote
access client back at either a static or dynamically configured phone
number. Common CBCP options include the phone number being used by the
remote access server to call the remote access client back.
</quote>

--
~Randy