IPv6 just quit working

[d-cubed]

I see a ticket from May 2020 where this also happened. I was living my life with OpenWRT and IPv6 worked fine out of the box. Then it just disappeared one day.
I was wondering how to trouble shoot and see if maybe it is my provider.
Following the comments here, the output of ifstatus wan6

ifstatus wan6
{
	"up": false,
	"pending": true,
	"available": true,
	"autostart": true,
	"dynamic": false,
	"proto": "dhcpv6",
	"device": "br-wan6",
	"data": {
		
	}
}

ifconfig wan6
ifconfig: wan6: error fetching interface information: Device not found

ifup wan6 doesn't return anything.

[vgaetera]

uci -q delete network.wan.type
uci -q delete network.wan6.type
uci set network.wan6.ifname="@wan"
uci commit network
/etc/init.d/network restart

[d-cubed]

Thanks, Same error.

root@OpenWrt:~# ping6 www.google.com
PING www.google.com (2607:f8b0:4000:812::2004): 56 data bytes
ping6: sendto: Permission denied

and a new error:

{
"up": false,
"pending": false,
"available": false,
"autostart": true,
"dynamic": false,
"proto": "dhcpv6",
"device": "br-wan6",
"data": {

},
"errors": [
{
"subsystem": "interface",
"code": "DEVICE_CLAIM_FAILED"
}
]
}

[trendy]

Please run the following commands (copy-paste the whole block) and paste the output here, using the "Preformatted text </> " button:

Remember to redact passwords, MAC addresses and any public IP addresses you may have

ubus call system board; \
uci export network; uci export dhcp; uci export firewall; \
head -n -0 /etc/firewall.user

[d-cubed]

Thanks. I didn't see any MAC addresses, public IP addresses, or wireless info.

{
	"kernel": "4.14.171",
	"hostname": "OpenWrt",
	"system": "ARMv7 Processor rev 1 (v7l)",
	"model": "Linksys WRT1900ACv2",
	"board_name": "linksys,cobra",
	"release": {
		"distribution": "OpenWrt",
		"version": "19.07.2",
		"revision": "r10947-65030d81f3",
		"target": "mvebu/cortexa9",
		"description": "OpenWrt 19.07.2 r10947-65030d81f3"
	}
}
package network

config interface 'loopback'
	option ifname 'lo'
	option proto 'static'
	option ipaddr '127.0.0.1'
	option netmask '255.0.0.0'

config globals 'globals'
	option ula_prefix 'fdde:1376:5a15::/48'

config interface 'lan'
	option type 'bridge'
	option ifname 'eth0.1'
	option proto 'static'
	option ipaddr '192.168.1.1'
	option netmask '255.255.255.0'
	option ip6assign '60'

config interface 'wan'
	option ifname 'eth1.2'
	option proto 'dhcp'
	option type 'bridge'

config interface 'wan6'
	option proto 'dhcpv6'
	option type 'bridge'
	option reqprefix 'auto'
	option reqaddress 'try'
	option ifname '@wan'

config switch
	option name 'switch0'
	option reset '1'
	option enable_vlan '1'

config switch_vlan
	option device 'switch0'
	option vlan '1'
	option ports '0 1 2 3 5t'

config switch_vlan
	option device 'switch0'
	option vlan '2'
	option ports '4 6t'

package dhcp

config dnsmasq
	option domainneeded '1'
	option boguspriv '1'
	option filterwin2k '0'
	option localise_queries '1'
	option rebind_protection '1'
	option rebind_localhost '1'
	option local '/lan/'
	option domain 'lan'
	option expandhosts '1'
	option nonegcache '0'
	option authoritative '1'
	option readethers '1'
	option leasefile '/tmp/dhcp.leases'
	option resolvfile '/tmp/resolv.conf.auto'
	option nonwildcard '1'
	option localservice '1'

config dhcp 'lan'
	option interface 'lan'
	option start '100'
	option limit '150'
	option leasetime '12h'
	option dhcpv6 'server'
	option ra 'server'

config dhcp 'wan'
	option interface 'wan'
	option ignore '1'

config odhcpd 'odhcpd'
	option maindhcp '0'
	option leasefile '/tmp/hosts/odhcpd'
	option leasetrigger '/usr/sbin/odhcpd-update'
	option loglevel '4'

package firewall

config defaults
	option syn_flood '1'
	option input 'ACCEPT'
	option output 'ACCEPT'
	option forward 'REJECT'

config zone
	option name 'lan'
	list network 'lan'
	option input 'ACCEPT'
	option output 'ACCEPT'
	option forward 'ACCEPT'

config zone
	option name 'wan'
	list network 'wan'
	list network 'wan6'
	option input 'REJECT'
	option output 'ACCEPT'
	option forward 'REJECT'
	option masq '1'
	option mtu_fix '1'

config forwarding
	option src 'lan'
	option dest 'wan'

config rule
	option name 'Allow-DHCP-Renew'
	option src 'wan'
	option proto 'udp'
	option dest_port '68'
	option target 'ACCEPT'
	option family 'ipv4'

config rule
	option name 'Allow-Ping'
	option src 'wan'
	option proto 'icmp'
	option icmp_type 'echo-request'
	option family 'ipv4'
	option target 'ACCEPT'

config rule
	option name 'Allow-IGMP'
	option src 'wan'
	option proto 'igmp'
	option family 'ipv4'
	option target 'ACCEPT'

config rule
	option name 'Allow-DHCPv6'
	option src 'wan'
	option proto 'udp'
	option src_ip 'fc00::/6'
	option dest_ip 'fc00::/6'
	option dest_port '546'
	option family 'ipv6'
	option target 'ACCEPT'

config rule
	option name 'Allow-MLD'
	option src 'wan'
	option proto 'icmp'
	option src_ip 'fe80::/10'
	list icmp_type '130/0'
	list icmp_type '131/0'
	list icmp_type '132/0'
	list icmp_type '143/0'
	option family 'ipv6'
	option target 'ACCEPT'

config rule
	option name 'Allow-ICMPv6-Input'
	option src 'wan'
	option proto 'icmp'
	list icmp_type 'echo-request'
	list icmp_type 'echo-reply'
	list icmp_type 'destination-unreachable'
	list icmp_type 'packet-too-big'
	list icmp_type 'time-exceeded'
	list icmp_type 'bad-header'
	list icmp_type 'unknown-header-type'
	list icmp_type 'router-solicitation'
	list icmp_type 'neighbour-solicitation'
	list icmp_type 'router-advertisement'
	list icmp_type 'neighbour-advertisement'
	option limit '1000/sec'
	option family 'ipv6'
	option target 'ACCEPT'

config rule
	option name 'Allow-ICMPv6-Forward'
	option src 'wan'
	option dest '*'
	option proto 'icmp'
	list icmp_type 'echo-request'
	list icmp_type 'echo-reply'
	list icmp_type 'destination-unreachable'
	list icmp_type 'packet-too-big'
	list icmp_type 'time-exceeded'
	list icmp_type 'bad-header'
	list icmp_type 'unknown-header-type'
	option limit '1000/sec'
	option family 'ipv6'
	option target 'ACCEPT'

config rule
	option name 'Allow-IPSec-ESP'
	option src 'wan'
	option dest 'lan'
	option proto 'esp'
	option target 'ACCEPT'

config rule
	option name 'Allow-ISAKMP'
	option src 'wan'
	option dest 'lan'
	option dest_port '500'
	option proto 'udp'
	option target 'ACCEPT'

config include
	option path '/etc/firewall.user'

# This file is interpreted as shell script.
# Put your custom iptables rules here, they will
# be executed with each firewall (re-)start.

# Internal uci firewall chains are flushed and recreated on reload, so
# put custom rules into the root chains e.g. INPUT or FORWARD or into the
# special user chains, e.g. input_wan_rule or postrouting_lan_rule.

The GUI shows this.

[trendy]

@d-cubed

option type 'bridge'

Remove the bridge from wan and wan6. Also have a look here, he had the same issue with you.

Wan6 - Unknown error (DEVICE_CLAIM_FAILED)

Okay, something is very strange here. As a test, I temporarily set the protocol on WAN (eth0.2) to 'DHCPv6 client' instead of 'DHCP client' and restarted the interface. Thereafter, as expected, I pulled an IPv6 address via DHCP and could use ping6 as a test, BUT the IPv4 address was gone and I couldn't use ping4 (again, as expected). After then going back into the WAN (eth0.2) configuration and changing it back to 'DHCP client', I pull an IPv4 address on WAN and an IPv6 address on WAN6 (which…

[d-cubed]

You are awesome. I had not touched my router config. Any thoughts on how that might have happened?
I removed the bridge option and reran

uci -q delete network.wan.type
uci -q delete network.wan6.type
uci set network.wan6.ifname="@wan"
uci commit network
/etc/init.d/network restart

and it worked. Thank you.
[Sidenote - nano/pico isn't a package anymore?]

[dlakelan]

Nano should be available. Do opkg update and you should get it

[vgaetera]

package: nano

[d-cubed]

so odd, it didn't work - then it did
perhaps related to ipv6