Can't create and use a Class C network

[W Boring]

I have a lot of machines and IPs on my local network, and I want to be able to use a Class C 192.168.0.0 netmask 255.255.0.0, but I get a js error popup, which is quite bizarre.

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“Netmask should have at least 22 bits (255.255.252.0). You may continue anyway but remember - you was warned”

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[rs232]

Is this when defining br0 ? I would suggest posting a support request on the forum first:

https://www.linksysinfo.org/index.php?forums/tomato-firmware.33/

Specifying the tomato version, HW model and perhaps add a couple of screenshots?

[M_ars]

Can you re-test with 2020-8 ? (no backups, start from scratch)

[M_ars]

Working now?

[pedro]

Sure it working now.