From: George Spahl (georges@xxxxxxxxx)
Date: Sat Jul 29 2000 - 11:27:32 GMT-3
I can't remember the details but I once had a problem setting up some
tunnels and TAC advised me to try "tunnel mode ipip" which fixed the
problem. I tried this later on other tunnels, but I had some problems
which cleared up when I went back to GRE. Anyone know when you need to use
"ipip" tunnels instead of "gre"?
George
At 12:42 PM 7/28/00 -0400, Wojtek Iwanczyk wrote:
>yea, i intentionally changed the ip addressing values, im not sure the
>"fake" addresses are valid or not, i probably just typed in random #s ...
>
>Wojtek Iwanczyk
>Sr Support Engineer
>Exenet Technologies
>15 E 26th Street
>New York, NY 10010
>(212) 684 7300
>wiwanczyk@exenet.com
>
>
>>>> Dave Gingrich <Dave@dcg.org> 07/28/00 12:35PM >>>
>At 11:33 7/28/00 -0400, Wojtek Iwanczyk wrote:
>>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 ...
>
>It is uncommon for ISPs to block GRE unless requested to do so, however it
>is somewhat more common for an ISP to use addresses for serial links that
>are not routable (advertised) to the Internet. Sometimes you'll even see
>RFC1918 addresses used for this. Generally the major carriers don't do
>this, but the mom & pops might. Before you even start building the tunnel,
>the source and destination addresses must be able to ping each other.
>
>Also... Please tell us that you intentionally munged the IP addresses in
>your posted configs, since they are not even valid IPs.
>
>-Dave
>
>=========================
>David C. Gingrich, K9DC
>Indianapolis, Indiana
>Dave@dcg.org
>=========================
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:23:59 GMT-3