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

[Darrin B. Jewell]

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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