Cant get IPv6 working on LAN, works fine on router

Installing and Using OpenWrt
1

If I plug straight into my cable modem I can use IPv6 just fine. When I plug in the router it looks like its only getting a /128 address. I've tried relay mode. Stock firmware, dd-wrt. Nothing seems to work. I had it working before for years with prefix delegation but now that doesn't work.. When plugged into the modem the online IPv6 tests say it's native IPv6. ISP is Spectrum. Maybe I'm missing something.

2

Post the output:

ubus call system board; uci show network; uci show dhcp; ifstatus wan6

https://openwrt.org/docs/guide-quick-start/sshadministration

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3 
root@OpenWrt:~# ubus call system board; uci show network; uci show dhcp; ifstatu
s wan6
{
        "kernel": "4.14.195",
        "hostname": "OpenWrt",
        "system": "ARMv7 Processor rev 1 (v7l)",
        "model": "Linksys WRT1200AC",
        "board_name": "linksys,caiman",
        "release": {
                "distribution": "OpenWrt",
                "version": "19.07.4",
                "revision": "r11208-ce6496d796",
                "target": "mvebu/cortexa9",
                "description": "OpenWrt 19.07.4 r11208-ce6496d796"
        }
}
network.loopback=interface
network.loopback.ifname='lo'
network.loopback.proto='static'
network.loopback.ipaddr='127.0.0.1'
network.loopback.netmask='255.0.0.0'
network.globals=globals
network.globals.ula_prefix='fddc:27d8:1f96::/48'
network.lan=interface
network.lan.type='bridge'
network.lan.ifname='eth0.1'
network.lan.proto='static'
network.lan.ipaddr='192.168.1.1'
network.lan.netmask='255.255.255.0'
network.lan.ip6assign='60'
network.wan=interface
network.wan.ifname='eth1.2'
network.wan.proto='dhcp'
network.wan6=interface
network.wan6.ifname='eth1.2'
network.wan6.proto='dhcpv6'
network.@switch[0]=switch
network.@switch[0].name='switch0'
network.@switch[0].reset='1'
network.@switch[0].enable_vlan='1'
network.@switch_vlan[0]=switch_vlan
network.@switch_vlan[0].device='switch0'
network.@switch_vlan[0].vlan='1'
network.@switch_vlan[0].ports='0 1 2 3 5t'
network.@switch_vlan[1]=switch_vlan
network.@switch_vlan[1].device='switch0'
network.@switch_vlan[1].vlan='2'
network.@switch_vlan[1].ports='4 6t'
dhcp.@dnsmasq[0]=dnsmasq
dhcp.@dnsmasq[0].domainneeded='1'
dhcp.@dnsmasq[0].boguspriv='1'
dhcp.@dnsmasq[0].filterwin2k='0'
dhcp.@dnsmasq[0].localise_queries='1'
dhcp.@dnsmasq[0].rebind_protection='1'
dhcp.@dnsmasq[0].rebind_localhost='1'
dhcp.@dnsmasq[0].local='/lan/'
dhcp.@dnsmasq[0].domain='lan'
dhcp.@dnsmasq[0].expandhosts='1'
dhcp.@dnsmasq[0].nonegcache='0'
dhcp.@dnsmasq[0].authoritative='1'
dhcp.@dnsmasq[0].readethers='1'
dhcp.@dnsmasq[0].leasefile='/tmp/dhcp.leases'
dhcp.@dnsmasq[0].resolvfile='/tmp/resolv.conf.auto'
dhcp.@dnsmasq[0].nonwildcard='1'
dhcp.@dnsmasq[0].localservice='1'
dhcp.lan=dhcp
dhcp.lan.interface='lan'
dhcp.lan.start='100'
dhcp.lan.limit='150'
dhcp.lan.leasetime='12h'
dhcp.lan.dhcpv6='server'
dhcp.lan.ra='server'
dhcp.wan=dhcp
dhcp.wan.interface='wan'
dhcp.wan.ignore='1'
dhcp.odhcpd=odhcpd
dhcp.odhcpd.maindhcp='0'
dhcp.odhcpd.leasefile='/tmp/hosts/odhcpd'
dhcp.odhcpd.leasetrigger='/usr/sbin/odhcpd-update'
dhcp.odhcpd.loglevel='4'
{
        "up": true,
        "pending": false,
        "available": true,
        "autostart": true,
        "dynamic": false,
        "uptime": 1621,
        "l3_device": "eth1.2",
        "proto": "dhcpv6",
        "device": "eth1.2",
        "metric": 0,
        "dns_metric": 0,
        "delegation": true,
        "ipv4-address": [

        ],
        "ipv6-address": [
                {
                        "address": "2607:fcc8:bfc0:3e:a166:dff8:7a60:cf94",
                        "mask": 128,
                        "preferred": 603177,
                        "valid": 603177
                }
        ],
        "ipv6-prefix": [

        ],
        "ipv6-prefix-assignment": [

        ],
        "route": [
                {
                        "target": "::",
                        "mask": 0,
                        "nexthop": "fe80::201:5cff:fe75:fe46",
                        "metric": 512,
                        "valid": 1793,
                        "source": "2607:fcc8:bfc0:3e:a166:dff8:7a60:cf94/128"
                }
        ],
        "dns-server": [

        ],
        "dns-search": [

        ],
        "neighbors": [

        ],
        "inactive": {
                "ipv4-address": [

                ],
                "ipv6-address": [

                ],
                "route": [

                ],
                "dns-server": [

                ],
                "dns-search": [

                ],
                "neighbors": [

                ]
        },
        "data": {

        }
}
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4

Apparently there's no prefix and only a /128 address.

Check this way:

/etc/init.d/firewall stop; ifup wan6; sleep 10; ifstatus wan6

If there's still no prefix, then try to set up relaying:
https://openwrt.org/docs/guide-user/network/ipv6/start#router_advertisement_dhcpv6

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5

Any tips for getting relay mode working? Clients are only getting a link-local and gateway address. Even tried resetting router to defaults first

6

Spectrum gives out /56. I suggest reboot their modem. If that doesn't work, call their support.

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