Re: PPP 2.3.10 and kernel 2.2.13 problem?

Paul Fulghum (
Fri, 5 Nov 1999 12:31:38 -0600

From: Parto Chobeiry <>
> I use PPP to dial into an NT server with call back. Unfortunately, now
> I get the following when activating debug mode -- which I cannot
> correctly interpret:
> Serial connection established.
> Using interface ppp0
> Connect: ppp0 <--> /dev/modem
> sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MD5> <callback CBCP>
> 0x2159a4a9> <pcomp> <accomp>]
> rcvd [LCP ConfReq id=0x0 <asyncmap 0x0> <auth chap m$oft> <magic 0x22ef>
> <pcomp> <accomp>]
> sent [LCP ConfAck id=0x0 <asyncmap 0x0> <auth chap m$oft> <magic 0x22ef>
> <pcomp> <accomp>]
> rcvd [LCP ConfRej id=0x1 <auth chap MD5>]
> sent [LCP ConfReq id=0x2 <asyncmap 0x0> <callback CBCP> <magic 0x2159a4a9>
> <pcomp> <accomp>]
> rcvd [LCP ConfAck id=0x2 <asyncmap 0x0> <callback CBCP> <magic 0x2159a4a9>
> <pcomp> <accomp>]
> cbcp_lowerup
> want: 14
> peer refused to authenticate: terminating link
> sent [LCP TermReq id=0x3 "peer refused to authenticate"]
> rcvd [CHAP Challenge id=0xc <0ff5f9d502a9a2c4>, name = ""]
> rcvd [LCP TermAck id=0x3]
> Connection terminated.
> Terminating on signal 2.
> Connect script failed

It looks like the linux wants the NT server to authenticate with
chap-md5, which NT refuses with the ConfRej.
I dont think NT supports chap-md5 (only chap-m$oft).

NT requests linux to authenticate with chap-m$soft and linux
accepts, so chap-m$soft support is there.

You need to get pppd to either authenticate the peer (NT) with
chap-m$soft (I'm not sure how, look at the docs) or disable
authentication of the peer (noauth option).

Paul Fulghum
Microgate Corporation
9501 Capital of Texas Hwy
Austin, Texas 78759

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