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Routing configuration

• Always configure a default route.
• Add blackhole routes for subnets reachable using VPN tunnels. This ensures that if a VPN tunnel goes down, traffic is not mistakingly routed to the Internet unencrypted.

Policy routing

Keep the number of policy routes to a minimum to optimize performance in route lookup and to simplify troubleshooting.

Dynamic routing

• Select a Router ID that matches an IP assigned to an interface. This avoids the likelihood of having two devices with the same router ID.
• For routing over an IPsec tunnel, assign IP addresses to both ends of the tunnel.