From: Dave Gingrich (Dave@xxxxxxx)
Date: Fri Jul 28 2000 - 13:35:46 GMT-3
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
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David C. Gingrich, K9DC
Indianapolis, Indiana
Dave@dcg.org
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