[IPv6]: Router Advertisement is Getting Ignored -> no route

[RelentlesS]

THANKS for your fast replies!

@jow

Ipv6 not routed after a while, address marked as deprecated

Can you compare ifstatus wan6 while it works with the output when its broken? To me it sounds as if the IPv6 prefix leased by your ISP is somehow expiring and not renewed.

--> Please have a look at my first post

Ipv6 not routed after a while, address marked as deprecated

Do you have the default firewall rules present which allow inbound udp 546 traffic?

--> It is enabled. I did not changed anything in firewall other then turning Software flow offloading
on.

@shm0

Ipv6 not routed after a while, address marked as deprecated

Do you use the offload feature? When i enable software offload ipv6 connectivity stops working after some time. The wan6 interface is still up but no connections can be made, neither from the router or from the hosts in the lan.

--> I turned it off and rebooted but this had not any effect on my issue. Therefore I re-enabled it.

@cvmiller

[IPv6]: Router Advertisement is Getting Ignored -> no route

If you are using DHCPv6, then the timer on the RA doesn't matter (for the WAN). Since you will get a lease time for the DHCPv6. It sounds like there is an incompatibility between the DHCPv6 server on the Connect Box and the client on OpenWrt (these do exist). As a work-around, you may consider restarting the WAN6 via a cronjob (in the middle of the night.

--> If you compare the ifstatus wan6 of wokring and non working state in my 1st post you can see that 3 routes have a valid lifetime of 1800s which is the setting of the ConnectBox. Form my point of view the problem seems to be that the routes don't get renewed after 180s and therefore are not present after 1800s.

I tried to work around my issue by appending the following static routes to /etc/config/network without success. Therefore I deleted those lines after testing.

static routes

config route6
        option interface 'wan6'
        option target '::/0'
        option gateway 'fe80::3a43:7dff:fe65:611a'
        option metric '384'
	option source '2a02:908:1062:b31c::/62'

config route6
        option interface 'wan6'
        option target '::/0'
        option gateway 'fe80::3a43:7dff:fe65:611a'
        option metric '384'
	option source '2a02:908:1062:b300:deef:9ff:fef2:64e5/64'

config route6
        option interface 'wan6'
        option target '::/0'
        option gateway 'fe80::3a43:7dff:fe65:611a'
        option metric '384'
	option source '2a02:908:1062:b300:c354:2827:eb5a:57da/128'

Please note that I see

root@router:~# traceroute6 openwrt.org
traceroute6: can't connect to remote host: Permission denied
root@router:~# ping6 openwrt.org
PING openwrt.org (2a03:b0c0:3:d0::1af1:1): 56 data bytes
ping6: sendto: Permission denied

after the 1800 seconds (non working state). Is that normal behaviour? From a PC connected to OpenWRT's lan interface I see

[relentless@machine ~]$ traceroute6 openwrt.org
traceroute to openwrt.org (2a03:b0c0:3:d0::1af1:1), 30 hops max, 80 byte packets
connect: Network is unreachable

Attached you will find the IPv6 routes using ip -6 route command of working and non working state:

ip -6 route (working state)

root@router:~# ip -6 route
default from 2a02:908:1062:b300:c354:2827:eb5a:57da via fe80::3a43:7dff:fe65:611a dev eth0.2 proto static metric 384 pref medium
default from 2a02:908:1062:b300::/64 via fe80::3a43:7dff:fe65:611a dev eth0.2 proto static metric 384 pref medium
default from 2a02:908:1062:b31c::/62 via fe80::3a43:7dff:fe65:611a dev eth0.2 proto static metric 384 pref medium
2a02:908:1062:b300::/64 dev eth0.2 proto static metric 256 pref medium
2a02:908:1062:b300::/64 via fe80::3a43:7dff:fe65:611a dev eth0.2 proto static metric 512 pref medium
2a02:908:1062:b31c::/64 dev br-lan proto static metric 1024 pref medium
unreachable 2a02:908:1062:b31c::/62 dev lo proto static metric 2147483647 error -113 pref medium
fdea:cdc6:cf5c::/64 dev br-lan proto static metric 1024 pref medium
unreachable fdea:cdc6:cf5c::/48 dev lo proto static metric 2147483647 error -113 pref medium
fe80::/64 dev eth1 proto kernel metric 256 pref medium
fe80::/64 dev br-lan proto kernel metric 256 pref medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
fe80::/64 dev eth0.2 proto kernel metric 256 pref medium
fe80::/64 dev wlan1 proto kernel metric 256 pref medium
fe80::/64 dev wlan0 proto kernel metric 256 pref medium

ip -6 route (non working state)

root@router:~# ip -6 route
2a02:908:1062:b300::/64 dev eth0.2 proto static metric 256 pref medium
2a02:908:1062:b300::/64 via fe80::3a43:7dff:fe65:611a dev eth0.2 proto static metric 512 pref medium
2a02:908:1062:b31c::/64 dev br-lan proto static metric 1024 pref medium
unreachable 2a02:908:1062:b31c::/62 dev lo proto static metric 2147483647 error -113 pref medium
fdea:cdc6:cf5c::/64 dev br-lan proto static metric 1024 pref medium
unreachable fdea:cdc6:cf5c::/48 dev lo proto static metric 2147483647 error -113 pref medium
fe80::/64 dev eth1 proto kernel metric 256 pref medium
fe80::/64 dev br-lan proto kernel metric 256 pref medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
fe80::/64 dev eth0.2 proto kernel metric 256 pref medium
fe80::/64 dev wlan1 proto kernel metric 256 pref medium
fe80::/64 dev wlan0 proto kernel metric 256 pref medium

How do I add these routes via ip route add?

default from 2a02:908:1062:b300:c354:2827:eb5a:57da via fe80::3a43:7dff:fe65:611a dev eth0.2 proto static metric 384 pref medium
default from 2a02:908:1062:b300::/64 via fe80::3a43:7dff:fe65:611a dev eth0.2 proto static metric 384 pref medium
default from 2a02:908:1062:b31c::/62 via fe80::3a43:7dff:fe65:611a dev eth0.2 proto static metric 384 pref medium