Try installing NextDNS CLI on GL-MT300N-V2

But space is not enough …

Isn’t curl already in the default firmware?

If no space, you may need to use exroot and install on external storage.

Otherwise, pls just get a route with Nand flash, e.g. (AR300M, AR750S)

I do not understand about exroot

https://openwrt.org/docs/guide-user/additional-software/extroot_configuration

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