SonicWall TZ215 WAN failover

I have a sonicwall   setup for wan failover< ISP1 and ISP2.  When one goes down and switches over the DNS does not.  The ISP that it switches too DNS doesnt switch over and still looks at the initial DNS of the down ISP.  Is their a solution to this??
DNS is not setup on Sonicwall
DNS stops working on server when failover from isp1 to isp2 happens
DNS forwarders on server are open DNS First in list then google DNS servers
Server nic points to its self
clients nic point to Server for DNS
nexxtepAsked:
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Aaron TomoskySD-WAN SimplifiedCommented:
You you have an internal DNS? What hands out dhcp?

It sounds like you have an internal DNS server which means the sonicwall should use that for its DNS. Personally I never use the ISP DNS servers for anything.
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carlmdCommented:
Changing to point to external dns servers (like google) might solve your problem.
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nexxtepAuthor Commented:
DHCP and DNS is run on 2012 r2 server.  my server does point to Google and open DNS servers google being first. I have moved the forwarders up and down but no difference.  Once the failover falls back to the primary everthing works again.  Its just happens when going from ISP 1 to ISP 2 failover.
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carlmdCommented:
Do you have any firewall or App Control rules that force the dns services out a particular interface, or block it from one?

If not try this and see if it works. On your lan dns server change the dns to point to the LAN interface of the Sonicwall. Leave the secondary dns etc settings blank.
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nexxtepAuthor Commented:
Carlmd,      I have basic setup of the TZ215 loadbalaceing and failover all defaults new sonicwall. Question, on lan dns server you mentioned above do you mean change the primary forwarders on my dns server to point to the LAN interface of sonicwall???
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Aaron TomoskySD-WAN SimplifiedCommented:
There are lots of ways to setup dns, but here is what I would suggest:
sonicwall, dhcp, and everything else points to your internal windows 2012r2 dns server. If you have a second dc (you really really should), use that ip as the secondary. Remove all forwarders from your dns servers, and just let them use root hints.
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carlmdCommented:
Yes, change the forwarder to the LAN Sonicwall interface and do not list any secondary.

This is something that sometimes works depending upon your specific configuration.
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nexxtepAuthor Commented:
thank you experts that did help out alot.
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