Re: GRE VPN

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Thank you for the update.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
Hey all,
Looks like the manager at my ISP got everything going.  He did find the
router firewall blocking traffic and the Netopia firmware out of date.
Robert, Thanks for pointing me to those tools, gave me the ammo I needed to
go back to the ISP.  Everyone at ISP support line told me that everything
was open on the router and nothing is being blocked.  Funny how the manager
found it.  Anyway, in the end as long as it is working all is good.

Now I have to figure why the dialup clients work fine but one with a cable
internet connection wont browse :)

Again...
Thank you all
Steve

"Bill Grant" <not.available@online> wrote in message
news:%23PXhbYE1FHA.1108@xxxxxxxxxxxxxxxxxxxx...
>    GRE (Generic Routing Encapsulation) is an IP protocol, just like TCP or
> UDP. PPTP sets up and maintains the VPN connection. The data crossing the
> link is encrypted and then encapsulated with a GRE header. If anything in
> the path blocks GRE, no data is transmitted and the connection closes.
>
> ESteveP wrote:
>> Ok, thank you for these tools, used the pptpsrv and clnt and found
>> that my remote client is sending GRE packets but the server is not
>> recieving them. Reversed the roles and made the client the server and
>> vice versa and everything is good in that scenario.
>>
>> So it looks like my router, manged by my ISP is not allowing inbound
>> GRE or the ISP is blocking GRE.  ISP tells me that my router is wide
>> open and is acting only like a bridge scince we had a pix behind it. That
>> is as far as tech support from them goes, one guy told me he
>> never heard of GRE and wouldnt know how to check.
>>
>> I also tried connecting our test server to the inet via dialup and
>> then ran pptpsvr and the client connected and talked fine.
>>
>> Again I think it is either the ISP or the router.  The router btw is a
>> netopia 7100-c.  Sent ISP mgmt a long letter asking for higher level
>> support with this.
>>
>> Will keep everyone posted, if interested.  Any feed back is greatly
>> appreciated.
>>
>> Thanks Again
>>
>>
>> "ESteveP" <spetropoulos@xxxxxxxxxxx> wrote in message
>> news:OzDyv%23%230FHA.2428@xxxxxxxxxxxxxxxxxxxx...
>> Thanks, I will take a look and update you guys.
>>
>> Thanks Again,
>> Steve
>> "Robert L [MS-MVP]" <noreply@xxxxxxxxxxx> wrote in message
>> news:uicQfY50FHA.2932@xxxxxxxxxxxxxxxxxxxx...
>> if both client and server are windows, you may try pptpclnt and
>> pptpsrv tools. check this page for more details,
>>
>> VPN Troubleshooting Tools
>> VPN Troubleshooting Tools. 1. PPTPclnt and PPTPsrv to test GRE and
>> PPTP ... Troubleshooting IPSec Tools ...
>>
>> Bob Lin, MS-MVP, MCSE & CNE
>> Networking, Internet, Routing, VPN Troubleshooting on
>> http://www.ChicagoTech.net
>> How to Setup Windows, Network, VPN & Remote Access on
>> http://www.HowToNetworking.com
>> "SteveP" <SteveP@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>> news:DADA5B3E-9D49-4E67-AE0E-C9C697EC9EB9@xxxxxxxxxxxxx...
>> Hi,
>> How can we be sure GRE is working?
>> We have an ISA2004 server that we want to use as a VPN server and
>> can not seem to connect.  Everything we read pretty much is saying to
>> make sure we have GRE enabled.
>>
>> What happens is when we try to connect from an external location via
>> dialup or a cable connection we get timed out with the 721.
>>
>> Thanks
>> Steve
>
>



Relevant Pages

  • Re: Error 721 when trying to VPN
    ... either their ISP is ... "A connection between the VPN server and the VPN client w.x.y.z has been ... cause for this is that a firewall or router between the VPN server and the ... VPN client is not configured to allow Generic Routing Encapsulation (GRE) ...
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  • Re: Error 800 Unable to establish the VPN connection
    ... VPN error 800 is GRE or firewall issue. ... VPN troubleshooting toolsVPN Troubleshooting Tools. ... PPTPclnt and PPTPsrv to test GRE and PPTP ... ... The connection Details as follows: ...
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  • Re: GRE VPN
    ... Looks like the manager at my ISP got everything going. ... router firewall blocking traffic and the Netopia firmware out of date. ... > link is encrypted and then encapsulated with a GRE header. ... >> that my remote client is sending GRE packets but the server is not ...
    (microsoft.public.win2000.ras_routing)
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