Is it possible to add ipv6 to a deployed Shared network?

##### ISSUE TYPE

* Other / Question

##### COMPONENT NAME

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Network
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##### CLOUDSTACK VERSION

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CloudStack 4.18.1.0
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##### CONFIGURATION

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Network in advanced core zone
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##### OS / ENVIRONMENT

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N/A
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##### SUMMARY

Can you tell me if it is possible to add ipv6 to a deployed Shared network in an advanced core zone if the fields related to ipv6 were not filled in during its creation. Perhaps this can be achieved by editing the database? The important point is that there are already deployed vms in the network and their operability should not be disturbed.

まず、advanced core zones の Shared networks に対する CloudStack の IPv6 フィールドの処理方法と、変更がすでにデプロイされている VMs に与える影響を確認します。それらの VMs を中断せずに利用できるサポート対象の手段が存在するかを判断します。この手順を文書化するか、制限事項を確認できれば完了です。

索引モデルが issue の本文から書いたものです。