From: Sam Munzani (sam@xxxxxxxxxx)
Date: Fri Jul 28 2000 - 13:28:35 GMT-3
It's not port 47. It is Protocol type 47. Totally different animal.
On Fri, 28 Jul 2000, Truman, Michelle, NTCOM wrote:
> It is not common, but it does happen. I have seen it happen with
> International. Perhaps it was a case of using the access list to permit
> certain ports and deny all others and the GRE protocol was not considered
> when they set up the list. (Isn't that port 47?)
>
> -----Original Message-----
> From: Wojtek Iwanczyk [mailto:wiwanczyk@exenet.com]
> Sent: Friday, July 28, 2000 10:33 AM
> To: sam@chinet.com
> Cc: ccielab@groupstudy.com
> Subject: Re: GRE Tunneling ..
>
>
> Is it common for ISPs to block GRE ? I have set up GRE tunnels several times
> before and never ran into problems like this .... As for source/destination.
> i have tried using both the ethernet and serial (unnumbered IP from e0 ) but
> either did not work ...
>
> Wojtek Iwanczyk
> Sr Support Engineer
> Exenet Technologies
> 15 E 26th Street
> New York, NY 10010
> (212) 684 7300
> wiwanczyk@exenet.com
>
>
> >>> Sam Munzani <sam@chinet.com> 07/28/00 11:31AM >>>
> On Router1 you have set destination address to be Router-2's Ethernet
> interface address.
> So,
> On router-2 your tunnel source will be etheret0 not serial 0.1.
>
> Through internet you may face some problems if some ISP in your PATH to
> destination blocks GRE protocol. There is nothing you can do if that's the
> case.
>
> Sam
>
> On Fri, 28 Jul 2000, Wojtek Iwanczyk wrote:
>
> > I am attempting to set up a GRE tunnel through the internet between 2
> private networks. I am trying to use the ISP/WAN interfaces as my
> source/destination of the tunnel .. The config for the GRE is really simple,
> - Tunnel interface , source of tunnel, and destination ... Somehow I can not
> get it to work .. I know its probably something really stupid I am missing..
>
> >
> > at Router 2 I have tried using both the serial and ethernet interfaces as
> the tunnel source, but either does not work.. I also attempted using
> loopback interfaces as tunnel sources, but to no avail ..
> >
> > I would really appreciate any suggestions and/or comments ..
> >
> > thanx
> >
> >
> >
> > my configs are as follows ..
> > Router 1
> > »---------------------------
> > interface Tunnel0
> > ip address 192.168.151.1 255.255.255.0
> > tunnel source Serial0/1
> > tunnel destination 207.323.35.1
> >
> > interface Serial0/1
> > description Level-3
> > ip address 53.212.64.456 255.255.255.252
> > ip nat outside
> > encapsulation ppp
> >
> > Router2
> > »----------------------------------------
> > interface Tunnel0
> > ip address 192.168.151.2 255.255.255.0
> > tunnel source Serial0.1
> > tunnel destination 53.212.64.456
> >
> > interface Ethernet0
> > description Dayton-legal
> > ip address 207.323.35.1 255.255.255.0
> >
> > interface Serial0
> > description to WORLDCOM
> > no ip address
> > encapsulation frame-relay IETF
> > bandwidth 1536
> > no fair-queue
> > frame-relay lmi-type ansi
> > !
> > interface Serial0.1 point-to-point
> > description to WORLDCOM
> > ip unnumbered Ethernet0
> > no arp frame-relay
> > bandwidth 1536
> > frame-relay interface-dlci 426 IETF
> >
> >
> > Wojtek Iwanczyk
> > Sr Support Engineer
> > Exenet Technologies
> > 15 E 26th Street
> > New York, NY 10010
> > (212) 684 7300
> > wiwanczyk@exenet.com
> >
> >
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