In my experience if the router has an entry in its routing
table for the destination then the GRE tunnel will show as
up/up. But if for some reason the router does not have an
entry in its routing table for the destination then the
GRE tunnel will show as up/down.
HTH
Rick
On 7/13/2011 2:11 PM, Gert Doering wrote:
Hi,
On Wed, Jul 13, 2011 at 12:20:17PM -0400, Matthew Huff wrote:
If it cannot make the original connection it will show up/down
There is no connection to be made for a GRE tunnel.
Can you route from the source to the tunnel destination and are there any
firewalls that would block the GRE protocol?
Can the destination route back to the source loopback1?
All not relevant, unless "tunnel keepalive" is active.
Normally, the tunnel is down if either source or destination IP are not
set (like "loopback1 has no IP") or if there is no route to the destination
IP address.
gert
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