How to use route-map to permit only LAN (loopback) traffic or deny public traffic

I have 2 routers connected via iBGP (in a DMVPN tunnel) and i want to allow only LAN traffic to pass through them.

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If i use an ACL that denies them , like

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access-list 1 deny x.x.x.x x.x.x.x (as x.x.x.x being the network on my public interface) 

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all of the traffic stops.

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Any suggestionns ?

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