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Subject: pptp connection unreliable with MacOSX client, help!
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I've setup a vpn server with poptop 1.1.3 from the ports (FreeBSD 4.8 
release). It work fine, with mppe 128 enabled, from Windows 2000 and 
MacOSX 10.2 (using the built-in vpn client).

I use it to mount a volume through nfs and samba, so I can use cvs in 
local mode (needed).

However, on MacOSX, it is unreliable and the mountpoint freezes, until 
I manage to disconnect and reconnect the vpn.
  The following appears in /var/log/messages:

Jul  9 02:10:56 napalm pptpd[412]: CTRL: EOF or bad error reading ctrl 
packet length.
Jul  9 02:10:56 napalm pptpd[412]: CTRL: couldn't read packet header 
(exit)
Jul  9 02:10:56 napalm pptpd[412]: CTRL: CTRL read failed
Jul  9 02:11:58 napalm pptpd[421]: CTRL: EOF or bad error reading ctrl 
packet length.
Jul  9 02:11:58 napalm pptpd[421]: CTRL: couldn't read packet header 
(exit)
Jul  9 02:11:58 napalm pptpd[421]: CTRL: CTRL read failed
Jul  9 02:17:13 napalm pptpd[434]: GRE: 
read(fd=5,buffer=804d580,len=8196) from PTY failed: status = 0
error = No error
Jul  9 02:17:13 napalm pptpd[434]: CTRL: PTY read or GRE write failed 
(pty,gre)=(5,4)
Jul  9 02:18:35 napalm pptpd[441]: CTRL: EOF or bad error reading ctrl 
packet length.
Jul  9 02:18:35 napalm pptpd[441]: CTRL: couldn't read packet header 
(exit)
Jul  9 02:18:35 napalm pptpd[441]: CTRL: CTRL read failed

I've gone as far as setting nfs to tcp only, which helps go through 
disconnection/reconnection cycles. But it seems that once the vpn 
connection is wedged, it doesn't recover by itself.

I spent hours pinpointing this to pptp. Curiously, this problem 
manifests itself only on slow llinks, such as dialups. I can reproduce 
it by reducing the bandwidth with altq.

help...

Raph