[pptp-server] Re: [pptp-server] PPTP over dialup

[David Luyer]

> My problem is that it works fine over a LAN connection with either client, but
> fails with both clients when used over a dialup connection.  From looking at
> the debug traces on the server and the linux client, I can see that the server
> is sending the LCP requests and the client receives these and responds by
> sending the LCP acks, and its own LCP requests, BUT these are never received
> by the server.  The server just sends 10 requests and having got nothing back,
> times out.
> 
> This is not a firewall issue (I've eliminated the firewall for the purpose of
> trying to get this going) so what is it?  How do I get a handle on it?

Try doing 'tcpdump proto 47' at both ends to see if any GRE traffic is actually
getting sent/received at both ends.  If it's sent at one end but not received 
at the other, then it's getting lost somewhere in-between.

David.