[ale] Windoze VPN + Linux Firewall....

[Alan Dobkin]

On 9/20/2005 2:02 AM, Marvin the Martian wrote:
> I've got the port (1723) forwarded to the right IP on the lan, but the 
> client hangs on "verifying user/pass"...  Is there something else I need 
> to do?  Am I missing a clue here?

Yes, you must also forward the GRE protocol 47.  (This is not a TCP
port.)  With iptables:

iptables -A INPUT -p 47 -j ACCEPT

For more troubleshooting info, see:

http://poptop.sourceforge.net/dox/gre-protocol-unavailable.phtml

Alan