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[IPv6] IPv6 lease troubles after cable modem reboot

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During Summer months always have bad luck with cable modem (SB6121) rebooting due to signal problems. Now that HE tunnel is replaced /w delegated prefix from comcast :) (ISC 4.2.5 - "dhclient -6 -P eth0") Running into a problem after T4 reboot when cable modem comes back online IPv4 works...however IPv6 won't pass traffic until I manually restart dhcp client and it tries to pull a /64 again. Any ideas?

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