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Is it valuable to do DNS Leak Testing directly from a firewall and not just from the client side?

ao flag

I've been writing a tool that can be added as a package for pfSense, and essentially the tool allows you to perform a DNS leak test on any of the interfaces on the firewall appliance.

One developer I spoke with said that DNS leak testing from a firewall is not valuable, and that the test should only be performed from the client side.

I disagree with this sentiment, because I feel that ensuring that both the clients and firewall are not leaking DNS info (especially with a kill-switched, network-wide VPN config in place) is essential to maintaining the level of privacy and security desired.

I'm at a loss for thinking of any reasons why DNS leak testing at the firewall would not be useful, and unfortunately the other developer I spoke with didn't elaborate on their reasoning, so I was hoping someone could provide me with their opinion and reasons that I could use in my own consideration.

Thank you for any help!

mangohost

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