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Firewall best practices

I have the setup in the attached drawing.

The 871 is for VPN connections only. The firewall is enabled and only the IPSEC traffic is allowed in on that router.

I want to configure a failover to the other ISP by using object tracking.

I will need to add an address from the Sprint subnet to do this.

I have a couple of questions about the set up.

Should I be doing something to increase the security of the set up either way (with or without the changes)?

Will the changes I want to make have any affect negatively on security?

Thanks for any input

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