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-rw-r--r--doc/book/cookbook/real-world.md2
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diff --git a/doc/book/cookbook/real-world.md b/doc/book/cookbook/real-world.md
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--- a/doc/book/cookbook/real-world.md
+++ b/doc/book/cookbook/real-world.md
@@ -152,6 +152,8 @@ Check the following for your configuration files:
- Make sure `rpc_public_addr` contains the public IP address of the node you are configuring.
This parameter is optional but recommended: if your nodes have trouble communicating with
one another, consider adding it.
+ Alternatively, you can also set `rpc_public_addr_subnet`, which can filter
+ the addresses announced to other peers to a specific subnet.
- Make sure `rpc_secret` is the same value on all nodes. It should be a 32-bytes hex-encoded secret key.
You can generate such a key with `openssl rand -hex 32`.