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

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