UDP broadcast packets across subnets

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Yes, and no.

It’s actually do-able, so long as the intervening routers don’t have no ip directed-broadcasts or similar configured. However these days that’s the default because allowing normal broadcasts to traverse routers is a DoS problem.

If you really want to broadcast across subnets then you should be using IP Multicast instead. That still requires that the intervening routers are configured appropriately, but it is the “right” way to do it.

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