RE: Other than VPN, what is affected by GRE 47?
- From: v-edtian@xxxxxxxxxxxxxxxxxxxx (Edward Tian)
- Date: Wed, 14 Sep 2005 03:23:29 GMT
Dear David:
Thank you for posting here.
Technically speaking, GRE 47 protocol is used for PPTP connection between
the remote client and the VPN Server. It only affects the VPN connection
and nothing else will be affected by the router that doesn't fully
supported GRE 47 protocol. For example, RWW is using the port 80/443/4125,
OWA is using the port 443.
In most cases, we use the utility called "PPTP Ping" to test if 1723 port
and GRE protocol are allowed to pass through.
To do so:
a. Please run Pptpsrv.exe on the server side.
b. Run Pptpclnt.exe [ServerNameorIPaddress] on remote client.
c. When prompted by Pptpclnt.exe, type some text to send to Pptpsrv.exe,
and then click Enter.
d. You will see the text received at the host running Pptpsrv.exe. Then you
will see five GRE packets sent from Pptpclnt.exe and received at
Pptpsrv.exe.
NOTE: PPTP Ping tools (Pptpclnt and Pptpsrv) exist in Windows XP support
tools. For your convenience, I have attached the file within this reply.
NOTE: You should stop the Routing and Remote Access service on the RRAS
(VPN) server so that PPTPSRV can bind to port 1723
For your information: We usually use PPTP Ping utility to determine whether
any hardware router or firewall is blocking GRE Protocol 47. The router
must be able to pass Generic Route Encapsulation (GRE) protocol 47 for PPTP
traffic to connect correctly to use VPN. When a cable/DSL router cannot map
GRE protocol 47 to the Routing and Remote Access server, you cannot connect
to the server from the Internet.
More information about GRE 47:
VPN Tunnels- GRE Protocol 47 Packet Description and Use
http://support.microsoft.com/default.aspx?scid=KB;[LN];241251
Hope the above information helps. Please feel free to let me know if you
have any questions or concerns.
Have a nice day, David! :-)
Best Regards
Edward Tian(MSFT)
Microsoft CSS Online Newsgroup Support
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| Thread-Topic: Other than VPN, what is affected by GRE 47?
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| Subject: Other than VPN, what is affected by GRE 47?
| Date: Tue, 13 Sep 2005 10:36:02 -0700
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| I know that VPN uses GRE 47 and that some routers/firewalls have to be
| specifically configured for GRE 47, but what else is affected by a router
| that isn't correctly set up for GRE 47?
|
| VPN - affectted
| RWW -
| OWA -
| OMA -
| ???
|
| Thanx, David.
|
|
.
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