We broadcast our IPv6 gateway addressess through Router Advertisements. Please make sure your VPS has router advertisements enabled: 'sysctl net.ipv6.conf.all.accept_ra' should be 1.
If not, set it with 'sysctl net.ipv6.conf.all.accept_ra=1'
To make this setting persist after reboots, add 'net.ipv6.conf.all.accept_ra = 1' to /etc/sysctl.conf
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