[pptp-server] Out of order packet..

[Philip Van Baren]

The buffering out-of-order packet message is a result of the packet
reordering code added to 1.1.2, and doesn't indicate any problems.  Your
problem is your /etc/ppp/chap-secrets file does not contain a username
and/or servername match for the incoming request, probably because you
didn't list the domain name with the username in the chap-secrets file.
Note that it is trying to authenticate with the username "clstech\\georgev",
and NOT "georgev".

Phil

P.S.  The reason you are seeing the buffering out-of-order packet messages
there is a "feature" of how this was implemented.  Some clients start the
sequence with 0, some with 1.  Since pptpd is looking for packet 0 first, if
the client starts the sequence with 1 you will get a buffering packet #1
message while it waits for packet #0, then get a packet reorder timeout
message for packet #0 and then the buffering packet #2 message because it
buffers this packet briefly while it processes packet #1.

The PPTP spec is a little ambiguous on this issue, and can arguably be read
to mean that sequence numbers should start with either 0 or 1, so I can't
say which clients are right.  The way pptpd-1.1.2 is implemented it will
work for both cases, but will give these debug messages when the client
starts with sequence number 1.


> -----Original Message-----
> From: pptp-server-admin at lists.schulte.org
> [mailto:pptp-server-admin at lists.schulte.org]On Behalf Of George Vieira
> Sent: Monday, November 20, 2000 11:41 PM
> To: PPTP List (E-mail)
> Subject: [pptp-server] Out of order packet..
>
>
> Hi all,
>
> I finally found something I didn't notice trying to get mppe compiled into
> the kernel. I noticed that this release of RedHat 6.2 already have MS-CHAP
> and mppe compiled in.
>
> I thought I'd just try a Win98 client can turn on compression and
> encryption
> to see what happens and I got this which I have no idea where to go next..
>
> ----------------------
> Nov 21 14:49:20 linuxdev pppd[8364]: pppd 2.3.11 started by root, uid 0
> Nov 21 14:49:20 linuxdev pppd[8364]: Using interface ppp0
> Nov 21 14:49:20 linuxdev pppd[8364]: Connect: ppp0 <--> /dev/pts/1
> Nov 21 14:49:20 linuxdev pptpd[8363]: Buffering out-of-order packet; got 1
> after 4294967295
> Nov 21 14:49:23 linuxdev pptpd[8363]: Packet reorder timeout waiting for 0
> Nov 21 14:49:23 linuxdev pptpd[8363]: Buffering out-of-order packet; got 2
> after 0
> Nov 21 14:49:23 linuxdev pppd[8364]: No CHAP secret found for
> authenticating
> clstech\\georgev
> Nov 21 14:49:23 linuxdev pppd[8364]: MSCHAP-v2 peer authentication failed
> for remote host clstech\\georgev
> Nov 21 14:49:23 linuxdev pppd[8364]: Connection
> ----------------------
>
> What's the Buffering out-of -order packet error? Is this something I have
> set on the client? Or is there something in the kernel that still needs
> patching as I have had hell trying to patch the kernel properly...
>
>
> thanks,
> George Vieira
> Network Administrator
> http://www.citadelcomputer.com.au
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