Interface 'wan6_4' is setting up and down every 10sec

aluciani · October 11, 2025, 10:23am

Hello there, I recently installed OpenWRT on a router, behind the ISP box in bridge mode.
I m in france using Free ISP.
I’m using :
Protocol: Virtual dynamic interface (464XLAT (CLAT))

I have the logs :
Sat Oct 11 10:19:15 2025 daemon.notice netifd: Interface 'wan6_4' is setting up now
Sat Oct 11 10:19:28 2025 daemon.notice netifd: Interface 'wan6_4' is now down
Sat Oct 11 10:19:28 2025 daemon.notice netifd: Interface 'wan6_4' is setting up now
Sat Oct 11 10:19:41 2025 daemon.notice netifd: Interface 'wan6_4' is now down
Sat Oct 11 10:19:41 2025 daemon.notice netifd: Interface 'wan6_4' is setting up now

I’ve checked the Sys Log : Interface 'wan6_4' is setting up now... now down. In loop issue, but i already have a DNS setup in the options

AndrewZ · October 11, 2025, 10:25am

Please show the output of

ifstatus wan
ifstatus wan6

Don't hide too much

aluciani · October 11, 2025, 10:26am

root@OpenWrt:~# cat /etc/config/network

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

config globals 'globals'
	option ula_prefix '****:****:***::/48'
	option packet_steering '1'

config device
	option name 'br-lan'
	option type 'bridge'
	list ports 'eth0'
	list ports 'eth2'
	list ports 'eth3'
	list ports 'eth4'

config interface 'lan'
	option device 'br-lan'
	option proto 'static'
	option ipaddr '192.168.1.1'
	option netmask '255.255.255.0'
	option ip6assign '60'

config interface 'wan'
	option device 'eth1'
	option proto 'dhcp'
	option peerdns '0'
	list dns '94.140.14.14'
	list dns '94.140.15.15'

config interface 'wan6'
	option device 'eth1'
	option proto 'dhcpv6'
	option reqaddress 'try'
	option reqprefix '0'
	option norelease '1'
	option peerdns '0'
	list dns '2a10:50c0::ad1:ff'
	list dns '2a10:50c0::ad2:ff'
	list dns '2606:4700:4700::64'
	list dns '2606:4700:4700::6400'

config interface 'wireguardvpn'
	option proto 'wireguard'
	option private_key '****************************************'
	option listen_port '51820'
	list dns '94.140.14.14'
	list dns '94.140.15.15'
	list dns '2a10:50c0::ad1:ff'
	list dns '2a10:50c0::ad2:ff'
	list addresses '**.*.***.1/24'

config device
	option name 'wireguardvpn'

config wireguard_wireguardvpn
	option description '********'
	option public_key '********************************************'
	option private_key '*******************************************'
	option route_allowed_ips '1'
	list allowed_ips '**.*.***.*/24

aluciani · October 11, 2025, 10:30am

root@OpenWrt:~# ifstatus wan
{
	"up": true,
	"pending": false,
	"available": true,
	"autostart": true,
	"dynamic": false,
	"uptime": 21492,
	"l3_device": "eth1",
	"proto": "dhcp",
	"device": "eth1",
	"updated": [
		"addresses",
		"routes",
		"data"
	],
	"metric": 0,
	"dns_metric": 0,
	"delegation": true,
	"ipv4-address": [
		{
			"address": "**.**.**.*",
			"mask": 24
		}
	],
	"ipv6-address": [
		
	],
	"ipv6-prefix": [
		
	],
	"ipv6-prefix-assignment": [
		
	],
	"route": [
		{
			"target": "0.0.0.0",
			"mask": 0,
			"nexthop": "**.**.**.***",
			"source": "**.**.**.*/32"
		}
	],
	"dns-server": [
		"94.140.14.14",
		"94.140.15.15"
	],
	"dns-search": [
		
	],
	"neighbors": [
		
	],
	"inactive": {
		"ipv4-address": [
			
		],
		"ipv6-address": [
			
		],
		"route": [
			
		],
		"dns-server": [
			"***.27.40.***",
			"***.27.40.***"
		],
		"dns-search": [
			
		],
		"neighbors": [
			
		]
	},
	"data": {
		"dhcpserver": "**.**.**.***",
		"leasetime": 604800
	}
}

aluciani · October 11, 2025, 10:31am

root@OpenWrt:~# ifstatus wan6
{
	"up": true,
	"pending": false,
	"available": true,
	"autostart": true,
	"dynamic": false,
	"uptime": 21560,
	"l3_device": "eth1",
	"proto": "dhcpv6",
	"device": "eth1",
	"metric": 0,
	"dns_metric": 0,
	"delegation": true,
	"ipv4-address": [
		
	],
	"ipv6-address": [
		{
			"address": "****:**:***:****:***:****:****:****",
			"mask": 64,
			"preferred": 86169,
			"valid": 86169
		}
	],
	"ipv6-prefix": [
		
	],
	"ipv6-prefix-assignment": [
		
	],
	"route": [
		{
			"target": "****:***:***:****::",
			"mask": 64,
			"nexthop": "::",
			"metric": 256,
			"valid": 86169,
			"source": "::/0"
		},
		{
			"target": "::",
			"mask": 0,
			"nexthop": "fe80::3a07:16ff:fea1:c336",
			"metric": 512,
			"valid": 1569,
			"source": "****:***:***:****:***:****:****:****/64"
		}
	],
	"dns-server": [
		"2a10:50c0::ad1:ff",
		"2a10:50c0::ad2:ff",
		"2606:4700:4700::64",
		"2606:4700:4700::6400"
	],
	"dns-search": [
		
	],
	"neighbors": [
		
	],
	"inactive": {
		"ipv4-address": [
			
		],
		"ipv6-address": [
			
		],
		"route": [
			
		],
		"dns-server": [
			"****:**:**::1"
		],
		"dns-search": [
			
		],
		"neighbors": [
			
		]
	},
	"data": {
		
	}
}

AndrewZ · October 11, 2025, 10:44am

I see no need for 464xlat as you have native IPv4 connectivity, I suggest uninstalling it.
There is no need in using Cloudflare's DNS64 servers, remove them.
If you need a pair of custom DNS severs - keep what you have on wan6 and optionally on wan and remove them elsewhere.

aluciani · October 11, 2025, 11:17am

I’ll try to remove the package, but I installed it when I first install OpenWRT.
I had an connection issue and that package solved it : OpenWRT Loses DNS When ISP Box is set in bridge Mode - #67 by mk24

AndrewZ · October 11, 2025, 11:22am

Then you can add to wan6
option iface_464xlat '0'

aluciani · October 11, 2025, 11:23am

Black magic - it work, I don’t know why and how, but I removed the 464xlat packet, and I still have network connection, but no more log spam of interface going up and down, I’ll try to see if I loose internet connection in some days, or some hours, I’ll reinstall it and add the option.

lleachii · October 11, 2025, 12:42pm

No black magic, just this:

This part. Verify with your ISP, but it seems you initially used the wrong protocol.

I'm curious, why reinstall?

aluciani · October 11, 2025, 1:31pm

To clarify :

I was using CLAT because 2 months ago when I tried to setup OpenWRT, I didn t have network access (you can see in the issue mentionned).
I saying black magic, because today, I removed CLAT package and it still work, even though, 2 months ago, I didn’t have network connection without this packet.
“Verify ISP”, Yes my ISP does ipv6 to ipv6 that’s why I needed that CLAT package, but today, I removed it, and it still work.
“why reinstall” well, If my network goes down after I uninstall the CLAT package, I ll assume it’s because the CLAT package was needed, so I’ll reinstall it.

Anyway my network is now working, without the CLAT package so I don’t know ..

lleachii · October 11, 2025, 2:19pm

Indeed, but I was implying this must have changed.

Definitely keep a watchful eye on your ISP.

aluciani · October 11, 2025, 2:29pm

That s literally why I remove the ISP router… I don‘t trust it

patrakov · October 12, 2025, 1:42am

For the record, this is a known bug: https://github.com/openwrt/openwrt/issues/10907

system · October 22, 2025, 1:43am

This topic was automatically closed 10 days after the last reply. New replies are no longer allowed.