43 lines
1.5 KiB
Markdown
43 lines
1.5 KiB
Markdown
---
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title: Automatic IP Allocation and the Weave Proxy
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menu_order: 30
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search_type: Documentation
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---
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If [automatic IP address allocation]({{ '/tasks/ipam/ipam' | relative_url }}) is enabled in Weave Net (by default IPAM is enabled),
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then containers started via the proxy are automatically assigned an IP address, *without having to specify any
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special environment variables or any other options*.
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host1$ docker run -ti alpine:latest
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To use a specific subnet, you can pass a `WEAVE_CIDR` to the container, for example:
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host1$ docker run -ti -e WEAVE_CIDR=net:10.32.2.0/24 alpine:latest
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To start a container without connecting it to the Weave network, pass
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`WEAVE_CIDR=none`, for example:
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host1$ docker run -ti -e WEAVE_CIDR=none alpine:latest
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### Disabling Automatic IP Address Allocation
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If you do not want an IP to be assigned by default, the proxy needs to
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be passed the `--no-default-ipalloc` flag, for example:
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host1$ weave launch --no-default-ipalloc
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In this configuration, containers using no `WEAVE_CIDR` environment
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variable are not connected to the Weave network.
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Containers started with a `WEAVE_CIDR` environment variable are handled as before.
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To automatically assign an address in this mode, start the
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container with a blank `WEAVE_CIDR`, for example:
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host1$ docker run -ti -e WEAVE_CIDR="" alpine:latest
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**See Also**
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* [Address Allocation with IP Address Management (IPAM)]({{ '/tasks/ipam/ipam' | relative_url }})
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* [How to Manually Specify IP Addresses and Subnets]({{ '/tasks/ipam/manual-ip-address' | relative_url }})
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