[101771] in RedHat Linux List
Re: frame with bad fcs
daemon@ATHENA.MIT.EDU (Boris Lutz)
Sun Nov 29 10:30:03 1998
In-Reply-To: <36607F21.ED606F9A@chelmsford.com>
Date: Sun, 29 Nov 1998 16:18:57 +0100
To: redhat-ppp-list@redhat.com, redhat-list@redhat.com
From: Boris Lutz <blutz@stud.ee.ethz.ch>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
Thank you for your help! After setting asyncmap a0000 everything works fine!
I still don't know why the old settings without the asyncmap worked with
the analog modem and not with the new ISDN TA which is of course set to
hardware handshake and not software flow control but don't ask it's working!
An interesting thing was that the ISP didn't accept asyncmap ffffffff
(ConfRej) but asyncmap a0000 works.
Boris
>> I have problems running my ppp I always get this message (when full
>> debugging is enabled):
>>
>> ppp: frame with bad fcs, excess = f9c8
>>
>> Any Idea what might be wrong? Authentification and other setting
>> negotiation works fine but receiving ppp packages seems to fail :-(
>>
>
>This is sometimes caused by a misunderstanding between the two sides as
>to what the ACCM (Asynchronous Control Character Mask) is for sending
>control characters (i.e. < 20hex) from the other side to you. The usual
>thing to try first is to request that ALL 32 control characters be
>"escaped", the way they are anyway during the initial phase (which seems
>to be working for you). With pppd, you do that by saying in your pppd
>options:
>
>asyncmap ffffffff
>
>See what happens. Pay special attention in the log to whether the other
>side ACK's your asyncmap request. If the other side thinks you are using
>software flow control, he might be assuming a0000, so another thing to
>try is
>
>asyncmap a0000
Computers are actually powered by Chaos theory, not electricity...that
is just for the fan.
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