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Clarify container external connectivity in multi-network scenario #22086

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4 changes: 3 additions & 1 deletion docs/userguide/networking/dockernetworks.md
Expand Up @@ -293,7 +293,9 @@ specifications.
You can create multiple networks. You can add containers to more than one
network. Containers can only communicate within networks but not across
networks. A container attached to two networks can communicate with member
containers in either network.
containers in either network. When a container is connected to multiple
networks, its external connectivity is provided via the first non-internal
network, in lexical order.

The next few sections describe each of Docker's built-in network drivers in
greater detail.
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