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Fixes #22777 - Include IPv6 DNS in dual-stack ifcfg - #11288
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lzap
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Should be safe, we do not have any dual-stack snapshot tests.
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The generic kickstart ifcfg snippet selected either IPv4 or IPv6 DNS servers. On a dual-stack interface the IPv4 subnet always won, so IPv6 resolvers were omitted.
This combines the unique resolvers from both subnets and preserves their order. A safe-mode renderer test verifies all IPv4 and IPv6 DNS entries.