IPv6 disappears in relay mode

Installing and Using OpenWrt
1

Hello!

I managed to activate and the relay mode is working great, but something strange is happening... After a few hours, IPv6 disappears from devices, and I have to reconnect to bring back IPv6.

How can I resolve this?

2

What is relay mode?

Do you mean this:

If so why do you think you need it?

3

No friend.

The IPv6 interface has a relay mode that allows you to retransmit IPv6

1 Like
4

You could refer to your previous post if you cannot be bothered to give even a brief description of your problem. Then maybe people will not have to guess what you are talking about.

5

Explain the issue!!

I activated the relay mode settings and everything works. However, after a few hours I try to always reconnect my devices because IPv6 disappears on the devices

6

Do you have multiple LANs or just one?

I use IPv6 relay on an LTE connection (with one LAN, no guest) and it has been very stable. I have never tried multiple LANs. I would suggest disable everything DHCPv6 and run your network under RA/SLAAC only.

Another approach would be to NAT6 the guest network, and only provide the main lan with non-NAT relay addresses.

7

I use relay mode only on the lan interface.

It is like I said. It seems stable to me, however, a few hours later in the available ones, I have to reconnect them all, because the IPv6 disappears in them

8

“Insanity is doing the same thing over and over and expecting different results.” - Einstein.

I believe @viniribeirossa is talking about IPv6 relay mode.
e.g. /etc/config/dhcp

config dhcp 'lan'
	option interface 'lan'
...
	option ra 'relay'
	option dhcpv6 'relay'
	option ra_default '1'
	option ndp 'relay'
...

First things to check are whether your external interface also loses IPv6. Operators and ISP play with their IPv6 settings because they are not IPv6 ready yet.

Start by sharing your /etc/config/dhcp settings.

9 
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 cachesize '1000'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
        option nonwildcard '1'
        option localservice '1'
        option ednspacket_max '1232'
        option filter_aaaa '0'
        option filter_a '0'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv4 'server'
        list dhcp_option '6,10.10.10.1'
        option ra 'relay'
        option dhcpv6 'relay'
        option ndp 'relay'

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'

config dhcp 'wan6'
        option interface 'wan6'
        option ignore '1'
        option master '1'
        option ra 'relay'
        option dhcpv6 'relay'
        option ndp 'relay'

config dhcp 'mgmt'
        option interface 'mgmt'
        option start '100'
        option limit '150'
        option leasetime '12h'
        list dhcp_option '6,1.1.1.1,8.8.8.8'

config dhcp 'guest'
        option interface 'guest'
        option start '100'
        option limit '150'
        option leasetime '12h'
        list dhcp_option '6,8.8.8.8,1.1.1.1'
        option ra 'relay'
        option dhcpv6 'relay'
        option ndp 'relay'
10

what version are you running? Im on 23.05.2 and also trying to get IPv6 working with multiple VLANs on multiple APs, but often i dont get a working IPv6, no gateway gets passed to the client and IP gets assigned. If i do service ohdcpd restart then it will work for that client. So im guessing there is a bit of issue with that. I think i may try to use dnsmasq instead as DHCPv6/RA server.

11

I'm using 23.05.02

On my device it works very well on all interfaces, however, it is not recommended to do this, but it works.

However, after a few hours more devices lose IPv6, I try to always reconnect the devices to recognize the IPv6 addresses again.

12

Is the ISP changing your prefix?

13

It's always the same

14

Friends, I need your help

Moving with the ONT and my router I notice that the RA is not announcing new addresses IPv6 to the devices in mode relay

How can I resolve this?.

15

Are you getting a PD from your ISP? I get a /48 PD and have it set up that all my lan interfaces are in server mode, with a /64 delegated prefix.

16

You need to post how you configure WAN6 & LAN port, also your devices are Android? Windows? iOS? All of them losing the V6 address? Any system log showing some kind of error? You have to describe clearly.