Wireshark · Ethereal-dev: Re: [Ethereal-dev] PPP dissector bug

[Motonori Shindo <mshindo@xxxxxxxxxxx>]

Irfan,

Just for curiosity, which implementation are you playing with? I know
of at least one implementation (i.e. l2tpd) that passes Octet-stuffed
PPP-HDLC frames to LAC/LNS when the peer announces only "Asynchronous
framing" (A flag set, S flag unset) in Framing Capability AVP.

Regards,

From: Irfan Khan <ikhan@xxxxxxxxxxxx>
Subject: Re: [Ethereal-dev] PPP dissector bug
Date: Mon, 10 Mar 2003 20:33:26 -0700

> >
> >
> >On Mon, Mar 10, 2003 at 08:15:22PM -0700, Irfan Khan wrote:
> >  
> >
> >>0x7e is escaped in PPP (preceded by 0x7d).
> >>    
> >>
> >
> >To be precise, 0x7e is escaped in PPP in HDLC-like framing.  However, at
> >least as I read the L2TP spec, the framing is supposed to be removed by
> >the time the packets are encapsulated in L2TP, so that a 0x7e is just a
> >0x7e.
> >  
> >
> Yes a 0x7e becomes a 0x7e 0x5e.  I see what you are saying a protocol 
> with a protocol number 0x7e 0xkk would not work in this case.
> 
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