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# Ad-Hoc Configuration {#ad-hoc-network-config}
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You can use [](#opt-networking.localCommands) to
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specify shell commands to be run at the end of `network-setup.service`. This
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is useful for doing network configuration not covered by the existing NixOS
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modules. For instance, to statically configure an IPv6 address:
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```nix
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{
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networking.localCommands =
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''
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ip -6 addr add 2001:610:685:1::1/64 dev eth0
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'';
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}
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```
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