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Instead of always having to force IPv4 or IPv6, let's now also offer "auto" which will only enable IPv6 if the system has a default gateway for it. This means that properly configured dual-stack systems will default to "ipv4,ipv6" while those lacking a gateway will only use "ipv4". Note that no real connectivity test is performed, so firewalled systems may still get it wrong and might prefer to rely on a manual "ipv4" assignment.