[pptp-server] PPTPD under NetBSD: Proxy Arp not working?

Tue Oct 12 05:57:12 CDT 1999

Darrin,

Thank you for the email. To answer your questions:

1. Yes, I have the gre pseudo-device compiled into the kernel. It's most strange
that pptp does not work with this. I guess that both the kernel and the pptp are
trying to intercept ip protocol 6 packets?

    => The documentation should probably mention this fact.
    =>  and pptp should detect it and give a reasonable error.

I'll remove it and give it a try. Thank you for your help.
----- Original Message -----
From: Darrin B. Jewell <jewell at mit.edu>
To: Simson L. Garfinkel <simsong at vineyard.net>
Cc: <pptp-server at lists.schulte.org>; Darrin B. Jewell <jewell at mit.edu>
Sent: Monday, October 11, 1999 2:27 AM
Subject: Re: [pptp-server] PPTPD under NetBSD: Proxy Arp not working?

>
> Do you have the gre(4) pseudo-device compiled into your kernel?
> You will need to remove it for pptp to work on NetBSD.
>
> If that doesn't solve the problem, can you send along
> your /etc/ppp/options and /etc/pptpd.conf files?
>
> Also, does 'tcpdump -v' on walden's real network interface
> show both tcp packets on port 1723 and gre (ip protocol 6) packets?
>
> Darrin
>
> "Simson L. Garfinkel" <simsong at vineyard.net> writes:
>
> > Hi there. I'm trying to get PPTPD to run under NetBSD 1.4. The server
compiled
> > just fine, it receives incoming connections just fine, it starts up pppd
just
> > fine, and then I have problems.  Specifically, the pppd on the NetBSD box
seems
> > unable to exchange packets with the ppp client on the Win95 box.
> >
> > It seems that the problem is that the IP addresses being assigned to the
PPTPD
> > process are not accessible from the NetBSD box. I've tried assigning IP
> > addresses both on the local subnet and off, and neither seems to work.
> >
> > Here is typical trace:
> >
> > Oct  9 19:35:12 walden pptpd[994]: MGR: Reaped child 995
> > Oct  9 19:35:23 walden pptpd[999]: MGR: Launching /usr/local/sbin/pptpctrl
to
> > handle client
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: local address = 192.168.0.235
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: remote address = 192.168.1.235
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: pppd speed = 115200
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Client 195.36.211.41 control
> > connection started
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Received PPTP Control Message
(type:
> > 1)
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Made a START CTRL CONN RPLY packet
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: I wrote 156 bytes to the client.
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Sent packet to client
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Received PPTP Control Message
(type:
> > 7)
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Set parameters to 0 maxbps, 16
window
> > size
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Made a OUT CALL RPLY packet
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Starting call (launching pppd,
opening
> > GRE)
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: pty_fd = 4
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: tty_fd = 5
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: I wrote 32 bytes to the client.
> > Oct  9 19:35:23 walden pptpd[1000]: CTRL (PPPD Launcher): Connection speed =
> > 115200
> > Oct  9 19:35:23 walden pptpd[999]: CTRL: Sent packet to client
> > Oct  9 19:35:23 walden pptpd[1000]: CTRL (PPPD Launcher): local address =
> > 192.168.0.235
> > Oct  9 19:35:23 walden pptpd[1000]: CTRL (PPPD Launcher): remote address =
> > 192.168.1.235
> > Oct  9 19:35:23 walden pppd[1000]: pppd 2.3.5 started by simsong, uid 0
> > Oct  9 19:35:23 walden pppd[1000]: Using interface ppp0
> > Oct  9 19:35:23 walden pppd[1000]: Connect: ppp0 <--> /dev/ttyp2
> > Oct  9 19:35:23 walden pppd[1000]: sent [LCP ConfReq id=0x1 <auth chap MD5>
> > <magic 0x693fecf7> <pcomp> <accomp>]
> > Oct  9 19:35:50 walden last message repeated 9 times
> > Oct  9 19:35:53 walden pppd[1000]: LCP: timeout sending Config-Requests
> > Oct  9 19:35:53 walden pppd[1000]: Connection terminated.
> > Oct  9 19:35:54 walden pppd[1000]: Exit.
> > Oct  9 19:35:54 walden pptpd[999]: GRE: read(fd=4,buffer=6514,len=8196) from
> > PTY failed: status = 0 error = No error
> > Oct  9 19:35:54 walden pptpd[999]: CTRL: PTY read or GRE write failed
> > (pty,gre)=(4,5)
> > Oct  9 19:35:54 walden pptpd[999]: CTRL: Client 195.36.211.41 control
> > connection finished
> > Oct  9 19:35:54 walden pptpd[999]: CTRL: Exiting now
> > Oct  9 19:35:54 walden pptpd[994]: MGR: Reaped child 999
> >
> > As you can see, pptpd gets started up. It just seems then, though, that the
LCP
> > packets from the local machine aren't getting sent to the client, and that
> > requests from the client aren't coming in. I don't know if this has anything
to
> > do with the local and remote IP addresses assigned to pptpd or not.
> >
> > I do know that I am not seeing the IP address 192.168.0.235 show up in my
ARP
> > table. I'm not sure if I should see it show up or not.
> >
> > Perhaps the problem is that the pppd doesn't like being run on the other
side
> > of a PTY? I don't think so, but I don't have any proof.
> >
> > Any thoughts?
> >
> >
> >
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