Need some help with split DNS

I am not the best at DNS, but here goes. In our gateway I specify the DNS as to use 8.8.8.8 and 4.2.2.2. My first question is, is this best practice? I have a Windows environment, and one of my servers has DNS installed for local lookups.

I am asking this question because while on the office wifi, corporate e-mail doesnt work. My DNS is not set up as .local, it is set up as the external domain name. While researching a fix for this issue, it recommends setting up split DNS. To do this, I would need to set up a new forward primary zone that is not AD integrated. My second question is what effect(s) will this have on my domain PC's?
j_crow1Asked:
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Jason RybergTechnical Consultant IVCommented:
Why is the office wifi set to point to your mail's external domain?  If it's connected to your LAN, it should use the internal DNS server.
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j_crow1Author Commented:
It's not; the Aps use the same DNS setup as the internal office machines. It's the phones that look at the external mail address.
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Pramod UbheCommented:
try using your office dns server's IP as primary dns and keep 8.8.8.8 / 4.2.2.2 as alternate dns on one of the computer to see if it works.
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Jason RybergTechnical Consultant IVCommented:
In our gateway I specify the DNS as to use 8.8.8.8 and 4.2.2.2

On your DNS servers, do you have forwarders pointing to the gateway as a DNS source?  Otherwise you could set forwarders to the 8.8.8.8 and 4.2.2.2 IP addresses.  Is there a reason you're not using your ISP's DNS?
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DrDave242Commented:
In our gateway I specify the DNS as to use 8.8.8.8 and 4.2.2.2.
Is that gateway also the DHCP server for your network? If so, then it's likely giving those DNS server addresses out to DHCP clients, which isn't good if you've got an AD domain in place (and it sounds like you probably do).

All machines in an AD domain need to use only internal DNS servers (DNS servers in your domain, which are typically going to be domain controllers), because those are the only DNS servers that know anything about the machines in your domain. Using external DNS servers such as 8.8.8.8 and 4.2.2.2 will result in machines in your domain not being able to contact other machines in your domain.

I am asking this question because while on the office wifi, corporate e-mail doesnt work. My DNS is not set up as .local, it is set up as the external domain name.
Can you be more specific about this? What do you use for corporate email, and does your AD domain have the same name as your registered internet domain? If so, that's not ideal, but there's probably still a way to make everything work like it should.
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