The problem was with the asyncmap option not beeing set. I read in a
newsgroup that the CRC problem probably was due to a broken peer. Anyway the
asyncmap 0 parameter to pppd solved my problems.
M�rten Gustafson wrote:
> Hi
>
> I have a problem with linux PPP and my ZyXEL ISDN omni.net plus modem. I
> know this mailing list is not the appropriate place for this question,
> but since got answers concerning ISDN before, I guess there are a few
> people on this list with the same configuration as me.
>
> Is there a better mailing list or news group for my question?
>
> I have a linux box with kernel 2.0.36, pppd version 2.3.5-1.The modem is
> a omi.net plus with firmware version 4.16c (European ISDN). The modem is
> set up for sync HDLC to async PPP conversion, modem command ATB40.
>
> The connection phase works alright with authentication and network
> address negotiation etc. The problems starts in the network phase. All
> incoming packets are discarded due to a CRC error:
> kernel: ppp: frame with bad fcs, excess = XXXX.
> Not a single frame is received. I have turned off anything resmbling of
> compression in my pppd.
>
> When using the modem from windows 95 it works just fine.
>
> Is the CRC received created by my ISP or by the modem?
> Is there a special Microsoft PPP protocol?
> The manual states that STAC/LZS (RFC1974) is only supported in modes 0,
> 3 and 4, not mode 2(CRC). Is this the problem?
> Does anyone have a clue?
>
> Thanks
>
> /M�rten
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