IPs to ping to validate Internet connection up for failover?

I'm setting up a new firewall with a main and backup Internet connection. I need to ping a couple of addresses from the each interface to validate that they are up and able to route traffic.

In the past I have used things like a my next hop router and something like google.com and  DNS servers etc.

What's your pick for a couple of IP's that if either works I can assume the circuit is alive and passing traffic?
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willp2Asked:
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asavenerConnect With a Mentor Commented:
4.2.2.2, 4.2.2.3, 8.8.8.8, 8.8.4.4, as well as your ISP's DNS servers.
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Ross TurnerConnect With a Mentor Management Information Support AnalystCommented:
You could use Googles DNS IP
8.8.8.8
8.8.4.4

this is what i use for my barracuda firewall... it works a treat
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willp2Author Commented:
Thanks for the input!
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