On Fri, 10 Oct 2014 13:05:18 -0600
Doug Applegate <dappleg...@cradlepoint.com> wrote:

> I'm seeing some strange behaviour trying to get shortcut routes
> working between three opennhrp routers using OSPF (Cradlepoint
> routers with linux kernel 3.10). Here's my setup:
> 
> R1------------------------------>NBMA gateway------------------>HUB
> Lan client: 192.168.1.5/24        NBMA: 10.0.0.2
> NBMA: 10.0.1.2             mGRE: 192.168.100.254
> mGRE: 192.168.100.1/24
> 
> R2------------------------------>
> Lan client: 192.168.2.5/24
> NBMA: 10.0.2.2
> mGRE: 192.168.100.2/24
> 
> The NBMA gateway provides full routing between R1, R2, and the HUB.
> 
> Basically I'm seeing troubles when using an OSPF point-to-multipoint 
> network getting the shortcut route to establish when pinging from the 
> lan client networks of R1 (192.168.1.5/24) to the lan client networks
> of R2(192.168.2.5/24).
> 
> The error I'm seeing is that the shortcut route is being added with
> the correct nexthop address, but the peer GRE link between
> 192.168.100.1 and 192.168.100.2 is not coming up and this is
> preventing the shortcut route from being added by opennhrp to the
> routing table.

This looks unusual setup to me. Why is R1 having a mGRE address,
but not being directly connected to the mGRE network?

I think the problem is caused by the fact that R1's mGRE address is
OSPF routed and not NHRP managed. Currently the code treats mGRE
addresses specially and they all are expected to be directly connected.

If you want to route R1 via NBMA GRE, it would be better if the NBMA
gateway announced itself as next hop; and thus R1 does not need mGRE
address.

/Timo

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