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We would like to force all our local node traffic to use the local network instead of the internet to communicate between eachother. Any best practice to do this?

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To allow a node to connect to other nodes in the local network you will want to use the following flags:

--allow-private-ipv4: Always accept connecting to private IPv4 addresses.
--discover-local: Enable peer discovery on local networks.

As is explained in polkadot --help, those options are Enabled by default for chains marked as "local" in their chain specifications, or when --dev is passed".

Moreover if you want to restrict connection only to certain peers, you should look into the --reserved-nodes and --reserved-only flags.

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  • Would this still allow external connections over the internet though? I would like the nodes we are running only communicate local but still want other nodes to connect across the internet.
    – Zoltan75
    Nov 1, 2022 at 14:53
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    As far as I know this doesn't prevent internet traffic as long as your node is reachable on a public IP. Nov 3, 2022 at 11:44

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