IPv6 question - Can it be enabled without resetting the settings to default

[sppmaster]

I've edited the rule by removing both lines

        option src_ip 'fc00::/6'
        option dest_ip 'fc00::/6'

Restarted the wan6 interface then rebooted the router but still no IPv6.

[trendy]

Run the troubleshooting commands for dhcp6

DHCP configuration

[sppmaster]

Any ideas?

~# tcpdump -evni any udp port 547 & \
> sleep 5; \
> killall -SIGUSR1 odhcp6c; \
> sleep 5; \
> killall tcpdump
tcpdump: data link type LINUX_SLL2
tcpdump: listening on any, link-type LINUX_SLL2 (Linux cooked v2), snapshot length 262144 bytes
20:47:36.023938 eth0.2 Out ifindex 14 b0:7f:b9:3e:4f:ae ethertype IPv6 (0x86dd), length 171: (flowlabel 0x7578d, hlim 1, next-header UDP (17) payload length: 111) fe80::b27f:b9ff:fe3e:4fae.546 > ff02::1:2.547: [bad udp cksum 0xb873 -> 0x2bd6!] dhcp6 solicit (xid=181f6d (elapsed-time 0) (option-request SIP-servers-domain SIP-servers-address DNS-server DNS-search-list SNTP-servers NTP-server AFTR-Name opt_67 opt_94 opt_95 opt_96 opt_82) (client-ID hwaddr type 1 b07fb93e4fae) (reconfigure-accept) (Client-FQDN) (IA_NA IAID:1 T1:0 T2:0) (IA_PD IAID:1 T1:0 T2:0))
20:47:37.102710 eth0.2 Out ifindex 14 b0:7f:b9:3e:4f:ae ethertype IPv6 (0x86dd), length 171: (flowlabel 0x7578d, hlim 1, next-header UDP (17) payload length: 111) fe80::b27f:b9ff:fe3e:4fae.546 > ff02::1:2.547: [bad udp cksum 0xb873 -> 0x2b6b!] dhcp6 solicit (xid=181f6d (elapsed-time 107) (option-request SIP-servers-domain SIP-servers-address DNS-server DNS-search-list SNTP-servers NTP-server AFTR-Name opt_67 opt_94 opt_95 opt_96 opt_82) (client-ID hwaddr type 1 b07fb93e4fae) (reconfigure-accept) (Client-FQDN) (IA_NA IAID:1 T1:0 T2:0) (IA_PD IAID:1 T1:0 T2:0))
20:47:39.182720 eth0.2 Out ifindex 14 b0:7f:b9:3e:4f:ae ethertype IPv6 (0x86dd), length 171: (flowlabel 0x7578d, hlim 1, next-header UDP (17) payload length: 111) fe80::b27f:b9ff:fe3e:4fae.546 > ff02::1:2.547: [bad udp cksum 0xb873 -> 0x2a9b!] dhcp6 solicit (xid=181f6d (elapsed-time 315) (option-request SIP-servers-domain SIP-servers-address DNS-server DNS-search-list SNTP-servers NTP-server AFTR-Name opt_67 opt_94 opt_95 opt_96 opt_82) (client-ID hwaddr type 1 b07fb93e4fae) (reconfigure-accept) (Client-FQDN) (IA_NA IAID:1 T1:0 T2:0) (IA_PD IAID:1 T1:0 T2:0))

3 packets captured
5 packets received by filter
0 packets dropped by kernel

[trendy]

It doesn't show much. Packets go out but nothing returns.
Maybe it would be best time-wise to take a backup, reset to defaults and set it up step by step. This way you'll know what breaks ipv6.

[sppmaster]

Just a short update to the topic. It seems that the commands I've used to disable IPv6 (look at the first post) fundamentally broke that functionality. I was unable to reverse the broken IPv6 functions without resetting to default settings.
So my conclusion and recommendation to others is simply to not use those commands to disable IPv6 if you intend to use IPv6 later, because you will have to reset your router to default.