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Dual WAN failover DNS question

Right now, I am passing one DNS server from each of my ISPs with the DHCP server for my LAN. I'd like to be able pass the correct DNS servers for the WAN which is currently up. I'm worried that the clients may be choosing the wrong DNS server for the current WAN connection and suffering a performance hit for DNS lookups.

I guess an alternative if I can't do that would be to set up my router as a DNS server for the LAN?

Thoughts? Suggestions?

Thanks,

     Greg

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