[pptp-server] Problems with iPAQ clients?

[Geckomail User]

G'day everyone!

I've been lurking on the list for a while now, but this is my first post. I
was wondering if anyone else has tried to set up a VPN server for the Compaq
iPAQ and PocketPC 2002.

I'm running PoPToP on a box with the 2.2.19 kernel and all the patches
suggested on the PoPToP web site, and everything works perfectly with Win98,
Win2K and WinXP Pro clients.

When I try to connect with the iPAQ, the VPN client can establish a
connection (it uses 128-bit stateless MPPE) and all seems to be well. It
obtains an IP address, default gateway, DNS servers etc and becomes
addressable on the network. I can ping it from other hosts on my home LAN -
for hours without fail.

The problem is that as soon as I transmit any reasonable amount of data (eg.
a web page) over the link, the VPN falls over and the iPAQ crashes (needs a
hard reset).

I'm thinking maybe it could be the iPAQ isn't handling a full IP packet - it
handles all the small ICMP packets, but when I send large (full) packets in
downloading files (or even ping -s 1500 <address>) it crashes.

I've tried reducing the max MTU, thinking that perhaps it has buffer
troubles, but to no avail. Tried settings of 1500, 1412 (same as PPPoE);
1000, 500 and 412. No luck - same problem.

Has anyone else experienced this kind of problem? Is there a known bug in
PocketPC 2002's PPTP implementation? Does anyone have it working?


Regards,
Andrew