Re: Networking problem....

[Adam Tauno Williams <adam@xxxxxxxxxxxxxxxx>]

>>the question boils down to... why doesn't it work through the router? 
>Most likely the router only does (or is configured to do) TCP/IP and
>UDP/IP.  PPTP at least uses GRE/IP for session setup and management 
>which means it won't work via most routers/firewalls.  
>>(and thus) How can the router configuration be changed to accomodate 
>>all of this?

To help you in searching the router docs:

PPTP uses a control channel on TCP port 1723,  tunneled data is sent in GRE
(protocol 47, RFC1701).  PPTP is basically a PPP connection via GRE instead of
serial.

IPsec uses UDP port 500 for key exchange and ESP (protocol 50) for tunnelled
data.  Some IPsec client/servers use protocol AH (protocol 51) as well, which
computes a checksum off the IP and thus CANNOT be run through NAT.

Systems and Network Administrator
Morrison Industries
1825 Monroe Ave NW.
Grand Rapids, MI. 49505