[pptp-server] Weird connection problem

[Nate Carlson]

On Mon, 13 Mar 2000, Andrew McRory wrote:

> On Mon, 13 Mar 2000, Nate Carlson wrote:
> 
> <snip>
> 
> > > into ther server and can telnet to port 1723 just fine. The problem starts
> > > when we try to initiate a connection from the Windows 98 machine we get an
> > > "error 629 you have been disconnected from the machine you dialed...". My
> > > Windows machine will connect to other PoPToP servers but not this one.
> > 
> > *massive snip*
> > 
> > According to the above, the cable modem has it's own IP address, and then
> > NAT translates traffic to your machine. Are you _positive_ that it is
> > translating & allowing GRE? From what I can tell, it doesn't sound like
> > the GRE traffic is ever getting to the linux box... I've heard of tons of
> > problems using cable modems with weird protocols, this could be another
> > one of those..
> 
> AFAIK the GRE is being allowed. Running the GRE modified traceroute shows
> GRE being passed up until the final interface, eth1 on the linux box. It
> looks to me like eth1 won't allow GRE OR the cable modem is not bridging
> correctly... 
> 

Yeah... my bet is that the cable modem is not translating it across the
connection.. have you looked for any configuration options on it to allow
you to configure what protocols are allowed through/filtered/etc? Also,
just for the sake of experimentation, have you tried making and outgoing
pptp connection from that Linux box to see if GRE will go across the
connection? Another good troubleshooting step would be to use the GRE
traceroute from the pptp server out to the internet..

-- 
Nate Carlson <natecars at real-time.com>   | Phone : (612)943-8700
http://www.real-time.com                | Fax   : (612)943-8500