内网用户IPV6故障不通

ipv6 dhcp prefix-pool 1 prefix 240E:648:18A2:1F00::/56 assign-len 56 # ipv6 dhcp pool ipv6 network 240E:648:18A2:1F00::/56 address range 240E:648:18A2:1F00::2 240E:648:18A2:1F00::FFFF dns-server 240E:51:C800:4::4 dns-server 240E:51:C800:8::8 prefix-pool 1 preferred-lifetime 86400 valid-lifetime 259200 gateway-list 240E:648:18A2:1F00::1 # interface GigabitEthernet0/1 port link-mode route description Multiple_Line combo enable copper ip address 222.80.39.97 255.255.255.0 dns server 61.128.114.133 dns server 61.128.114.166 nat outbound nat server protocol tcp global 222.80.39.92 21 inside 192.168.0.120 21 ipv6 address 240E:648:18A0:19F0::2/64 # interface GigabitEthernet0/2 port link-mode route combo enable copper ip address 192.168.0.254 255.255.255.0 ipv6 dhcp select server ipv6 dhcp server apply pool ipv6 ipv6 address 240E:648:18A2:1F00::1/56 ipv6 nd autoconfig managed-address-flag ipv6 nd autoconfig other-flag undo ipv6 nd ra halt # ip route-static 0.0.0.0 0 GigabitEthernet0/1 222.80.39.1 preference 250 ipv6 route-static :: 0 240E:648:18A0:19F0:: #

运营商bas-光猫-ICG5000-交换机-计算机，IPv4是通的，防火墙上可以ping通运营商DNS，防火墙上也可以ping通内网计算机，但内网计算机无法ping通DNS