First of all, I do not really see the advantage of configuring this as point-point. Appearently you want to make all traffic flow over the central router? The radio is actually a point-to-multipoint medium by nature. This means that the bandwidth on the link will be shared, no matter what you configure.
You could "enforce" point-point behaviour by means of static routing. On all spoke-routers you configure a single static route 0.0.0.0 with the hub router as the next hop.
On the the central router you can then put statics to the respective destinations. Very important is to use the interface command "no ip redirects"
This prevents icmp redirects being sent which would cause non-point-to-point behaviour. This implies that you have used the same ip subnet for all routers. This is what I would configure for this case.
Alternatively, you may use different subnets per router and apply secondary IP's on the hub.
You can configure secondary IP address in the hub router, but what I mentioned is to configure one IP in hub router physical interface then configure 4 tunnel interfaces for individual spoke routers. It should provide the same function.
Really appreciate the help, but I'm not sure you're not getting what I want to do.
I want to make it so that if I remove the x.x.x.17 from the interface, one of my router (x.x.x.16) will no longer forward traffic to the hub router.
Someone told me I need to set up a point to point link for this, with one point of the pair being on the spoke and the other on the hub router. I check out point to point and I keep getting references to frame relay. Is that what I need to do?
I'm thinking the first suggestion with all spoke routers being on different subnets and then with multiple secondary address on the single physical interface would work. However, I may not have that many subnets to go around.
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