Include ipv6 flag in dual-stack macvlan IPv4/IPv6 network

[jordan-powers]

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Hello, I just spent several hours trying to debug why my macvlan network wasn't working with ipv6 connectivity. Turns out, I needed the --ipv6 flag in the docker network create command. It would be nice if the documentation indicated that this flag was needed.

Proposed changes

Add --ipv6 flag to the example command to create a dual-stack IPv4/IPv6 macvlan network.

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[usha-mandya]

@thaJeztah Could you PTAL? Thanks.

[SoraKasvgano]

oh hello do you know how to create an ipv6 macvlan network?

docker network create -d macvlan --subnet=192.168.1.0/24 --gateway=192.168.1.1 --ipv6 -o parent=eth0 -o macvlan_mode=bridge macnet

i want to use a openwrt docker image on my rpi as my sencondary router......

it needs a macvlan network....

i view examples from official doc is

docker network create -d macvlan --subnet=192.168.216.0/24 --gateway=192.168.216.1 --subnet=2001:db8:abc8::/64 --gateway=2001:db8:abc8::10 -o parent=eth0.218 -o macvlan_mode=bridge macvlan216

but my IPV6 is dynamic offered by ASUS router IPV6 native method,like 240e:345:c1b:a101::/56 it will changed when i restart router.....240e:345:c1b:a201::/56 240e:345:c11:a000::/56 so how to create a macvlan with both IPV4 and IPV6?

[docker-robott]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

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