Thought I had a RAS/VPN Problem but....

[Bill]

Hi all,

Just wanted to make sure I was seeing things right.

When I try to connect to my server with pptpclnt from the Internet I
connect to port 1723 just fine but when the GRE packets are sent I
receive ICMP Type 3 (Destination Unreachable) from an upstream server,
from the company that provides our T1. This means they are blocking
GRE/IP47, right?

Thanks,
Bill

 

[Herb Martin]

When I try to connect to my server with pptpclnt from the Internet I

connect to port 1723 just fine but when the GRE packets are sent I
receive ICMP Type 3 (Destination Unreachable) from an upstream server,
from the company that provides our T1. This means they are blocking
GRE/IP47, right?

That sounds probable -- GRE is IP 47 and is the actual tunnel used by
PPTP. (i.e., Generic Routing ENCAPSULATION)

 

[Marc Reynolds [MSFT]]

yes it sounds likely that the upstream router is blocking IP Protocol 47
(GRE).

Thanks,
Marc Reynolds
Microsoft Technical Support

This posting is provided "AS IS" with no warranties, and confers no rights.
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[Bill]

Thank you Herb,
Bill

That sounds probable -- GRE is IP 47 and is the actual tunnel used by
PPTP. (i.e., Generic Routing ENCAPSULATION)

 

[Bill]

Thank you Marc,
Bill

yes it sounds likely that the upstream router is blocking IP Protocol 47
(GRE).

Thanks,
Marc Reynolds
Microsoft Technical Support