I have exactly the same issue as reported in this post: GL-A1300 (Slate Plus) PPPoE Connection Failure
Model: GL-A1300
Firmware: v4.5.22
The WAN port works perfectly when configured as a WAN port, but won’t sync when configured as a PPPoE port.
VLAN is set to 2, as per ISP supplied router.
Username and password set correctly, exactly the same as in client supplied router.
Using exactly the same cable plugged into the same port on the NTD plugged into a client supplied router works with no drop outs.
The link is unstable and won’t stay up long enough to sync.
Adding a network switch inline doesn’t fix it.
Logs:
root@CORE-ROUTER:~# ip link show dev eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
root@CORE-ROUTER:~# logread | grep -iE 'eth1|link'
Mon Feb 9 15:00:46 2026 kern.info kernel: [ 72.451168] device eth1 left promiscuous mode
Mon Feb 9 15:00:46 2026 daemon.info avahi-daemon[5961]: Interface eth1.IPv6 no longer relevant for mDNS.
Mon Feb 9 15:00:46 2026 daemon.info avahi-daemon[5961]: Leaving mDNS multicast group on interface eth1.IPv6 with address <REMOVED>.
Mon Feb 9 15:00:46 2026 daemon.info avahi-daemon[5961]: Withdrawing address record for <REMOVED> on eth1.
Mon Feb 9 15:00:46 2026 kern.info kernel: [ 72.521614] ess_edma c080000.edma eth1: Link is Down
Mon Feb 9 15:00:46 2026 daemon.notice netifd: VLAN 'eth1.2' link is down
Mon Feb 9 15:00:46 2026 daemon.notice netifd: Interface 'wan' has link connectivity loss
Mon Feb 9 15:00:46 2026 kern.info kernel: [ 72.625554] device eth1 entered promiscuous mode
Mon Feb 9 15:00:46 2026 daemon.notice netifd: Network device 'eth1' link is down
Mon Feb 9 15:00:46 2026 kern.info kernel: [ 72.796527] device eth1 left promiscuous mode
Mon Feb 9 15:00:47 2026 kern.info kernel: [ 73.039016] device eth1 entered promiscuous mode
Mon Feb 9 15:03:50 2026 daemon.notice netifd: Network device 'eth1' link is up
Mon Feb 9 15:03:50 2026 kern.info kernel: [ 76.171391] ess_edma c080000.edma eth1: Link is Up - 1Gbps/Full - flow control rx/tx
Mon Feb 9 15:03:50 2026 kern.info kernel: [ 76.171492] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
Mon Feb 9 15:03:50 2026 daemon.notice netifd: VLAN 'eth1.2' link is up
Mon Feb 9 15:03:50 2026 daemon.notice netifd: Interface 'wan' has link connectivity
Mon Feb 9 15:03:52 2026 daemon.info avahi-daemon[5961]: Joining mDNS multicast group on interface eth1.IPv6 with address fe80::9683:c4ff:fe59:912c.
Mon Feb 9 15:03:52 2026 daemon.info avahi-daemon[5961]: New relevant interface eth1.IPv6 for mDNS.
Mon Feb 9 15:03:52 2026 daemon.info avahi-daemon[5961]: Registering new address record for fe80::9683:c4ff:fe59:912c on eth1.*.
Mon Feb 9 15:03:54 2026 user.notice AdGuardHome[8414]: 2026/02/09 04:03:54.639929 [info] go to http://[<REMOVED>]:3000
Mon Feb 9 15:04:06 2026 kern.info kernel: [ 91.834257] device eth1 left promiscuous mode
Mon Feb 9 15:04:06 2026 daemon.info avahi-daemon[5961]: Interface eth1.IPv6 no longer relevant for mDNS.
That repeats over and over.
More details
root@CORE-ROUTER:~# ip link show dev eth1
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
root@CORE-ROUTER:~# ethtool eth1 2>/dev/null
Settings for eth1:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
1000baseX/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
1000baseX/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Link partner advertised pause frame use: Symmetric Receive-only
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 4
Transceiver: external
Auto-negotiation: on
MDI-X: off (auto)
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000000 (0)
Link detected: yes
root@CORE-ROUTER:~# ifdown wan; ifup wan
root@CORE-ROUTER:~# logread -e pppd
Mon Feb 9 14:53:35 2026 daemon.info pppd[26999]: Plugin rp-pppoe.so loaded.
Mon Feb 9 14:53:35 2026 daemon.info pppd[26999]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.8
Mon Feb 9 14:53:35 2026 daemon.notice pppd[26999]: pppd 2.4.8 started by root, uid 0
Mon Feb 9 14:53:50 2026 daemon.warn pppd[26999]: Timeout waiting for PADO packets
Mon Feb 9 14:53:50 2026 daemon.err pppd[26999]: Unable to complete PPPoE Discovery
Mon Feb 9 14:53:50 2026 daemon.info pppd[26999]: Exit.
Mon Feb 9 14:53:54 2026 daemon.info pppd[28681]: Plugin rp-pppoe.so loaded.
Mon Feb 9 14:53:54 2026 daemon.info pppd[28681]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.8
Mon Feb 9 14:53:54 2026 daemon.notice pppd[28681]: pppd 2.4.8 started by root, uid 0
Mon Feb 9 14:54:10 2026 daemon.warn pppd[28681]: Timeout waiting for PADO packets
Mon Feb 9 14:54:10 2026 daemon.err pppd[28681]: Unable to complete PPPoE Discovery
Mon Feb 9 14:54:10 2026 daemon.info pppd[28681]: Exit.
Mon Feb 9 14:54:14 2026 daemon.info pppd[30459]: Plugin rp-pppoe.so loaded.
Mon Feb 9 14:54:14 2026 daemon.info pppd[30459]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.8
Mon Feb 9 14:54:14 2026 daemon.notice pppd[30459]: pppd 2.4.8 started by root, uid 0
Mon Feb 9 14:54:29 2026 daemon.warn pppd[30459]: Timeout waiting for PADO packets
Mon Feb 9 14:54:29 2026 daemon.err pppd[30459]: Unable to complete PPPoE Discovery
Mon Feb 9 14:54:29 2026 daemon.info pppd[30459]: Exit.
That repeats over and over.
root@CORE-ROUTER:~# uci set network.wan.proto='pppoe'
root@CORE-ROUTER:~# uci set network.wan.username='<REMOVED>'
root@CORE-ROUTER:~# uci set network.wan.password='<REMOVED>'
root@CORE-ROUTER:~# uci set network.wan.vlanid='2'
root@CORE-ROUTER:~# uci set network.wan.macaddr=’<REMOVED>'
root@CORE-ROUTER:~# uci commit network
root@CORE-ROUTER:~# ifdown wan; ifup wan
root@CORE-ROUTER:~# ifstatus wan
{
"up": false,
"pending": false,
"available": true,
"autostart": true,
"dynamic": false,
"proto": "pppoe",
"device": "eth1.2",
"data": {
},
"errors": [
{
"subsystem": "pppoe",
"code": "USER_REQUEST"
}
]
}
root@CORE-ROUTER:~# logread -e pppd
Mon Feb 9 14:39:31 2026 daemon.warn pppd[18970]: Timeout waiting for PADO packets
Mon Feb 9 14:39:31 2026 daemon.err pppd[18970]: Unable to complete PPPoE Discovery
Mon Feb 9 14:39:31 2026 daemon.info pppd[18970]: Exit.
Mon Feb 9 14:39:35 2026 daemon.info pppd[20541]: Plugin rp-pppoe.so loaded.
Mon Feb 9 14:39:35 2026 daemon.info pppd[20541]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.8
Mon Feb 9 14:39:35 2026 daemon.notice pppd[20541]: pppd 2.4.8 started by root, uid 0
Mon Feb 9 14:39:50 2026 daemon.warn pppd[20541]: Timeout waiting for PADO packets
Mon Feb 9 14:39:50 2026 daemon.err pppd[20541]: Unable to complete PPPoE Discovery
Mon Feb 9 14:39:50 2026 daemon.info pppd[20541]: Exit.
Mon Feb 9 14:39:55 2026 daemon.info pppd[22074]: Plugin rp-pppoe.so loaded.
Mon Feb 9 14:39:55 2026 daemon.info pppd[22074]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.8
Mon Feb 9 14:39:55 2026 daemon.notice pppd[22074]: pppd 2.4.8 started by root, uid 0
Mon Feb 9 14:40:10 2026 daemon.warn pppd[22074]: Timeout waiting for PADO packets
Mon Feb 9 14:40:10 2026 daemon.err pppd[22074]: Unable to complete PPPoE Discovery
Mon Feb 9 14:40:10 2026 daemon.info pppd[22074]: Exit
root@CORE-ROUTER:~# uci show network.wan
network.wan=interface
network.wan.force_link='0'
network.wan.ipv6='0'
network.wan.classlessroute='0'
network.wan.peerdns='1'
network.wan.metric='2'
network.wan.disabled='0'
network.wan.macaddr='<REMOVED>'
network.wan.device='eth1.2'
network.wan.proto='pppoe'
network.wan.username='<REMOVED>'
network.wan.password='<REMOVED>'
network.wan.vlanid='2'
root@CORE-ROUTER:~# uci show network.vlan_wan
network.vlan_wan=switch_vlan
network.vlan_wan.device='switch0'
network.vlan_wan.vid='2'
network.vlan_wan.vlan='2'
network.vlan_wan.ports='5t 0t'
root@CORE-ROUTER:~# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br-lan state UP mode DEFAULT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
9: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
11: ztuku57egm: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 2800 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
59: wlan-sta0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
113: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
183: eth1.2@eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether <REMOVED> brd ff:ff:ff:ff:ff:ff
root@CORE-ROUTER:~#
Link flapping…
root@CORE-ROUTER:~# while true; do date; cat /sys/class/net/eth1/carrier; sleep 1; done
Mon Feb 9 15:15:50 AEDT 2026
0
Mon Feb 9 15:15:51 AEDT 2026
0
Mon Feb 9 15:15:52 AEDT 2026
0
Mon Feb 9 15:15:53 AEDT 2026
0
Mon Feb 9 15:15:54 AEDT 2026
0
Mon Feb 9 15:15:55 AEDT 2026
0
Mon Feb 9 15:15:56 AEDT 2026
1
Mon Feb 9 15:15:57 AEDT 2026
1
Mon Feb 9 15:15:58 AEDT 2026
1
Mon Feb 9 15:15:59 AEDT 2026
1
Mon Feb 9 15:16:00 AEDT 2026
1
Mon Feb 9 15:16:01 AEDT 2026
1
Mon Feb 9 15:16:02 AEDT 2026
1
Mon Feb 9 15:16:04 AEDT 2026
1
Mon Feb 9 15:16:05 AEDT 2026
0
Mon Feb 9 15:16:06 AEDT 2026
0
Mon Feb 9 15:16:07 AEDT 2026
0
Mon Feb 9 15:16:08 AEDT 2026
0
Mon Feb 9 15:16:09 AEDT 2026
0
Mon Feb 9 15:16:10 AEDT 2026
0
Mon Feb 9 15:16:11 AEDT 2026
0
Mon Feb 9 15:16:12 AEDT 2026
0
Mon Feb 9 15:16:13 AEDT 2026
0
Mon Feb 9 15:16:14 AEDT 2026
0
Mon Feb 9 15:16:15 AEDT 2026
0
Mon Feb 9 15:16:16 AEDT 2026
0
Mon Feb 9 15:16:17 AEDT 2026
0
Mon Feb 9 15:16:18 AEDT 2026
1
Mon Feb 9 15:16:19 AEDT 2026
1
Mon Feb 9 15:16:20 AEDT 2026
1
Mon Feb 9 15:16:21 AEDT 2026
1
Mon Feb 9 15:16:22 AEDT 2026
1
Mon Feb 9 15:16:23 AEDT 2026
1
Mon Feb 9 15:16:24 AEDT 2026
1
Mon Feb 9 15:16:25 AEDT 2026
1
Mon Feb 9 15:16:26 AEDT 2026
1
Mon Feb 9 15:16:27 AEDT 2026
1
Mon Feb 9 15:16:28 AEDT 2026
1
Mon Feb 9 15:16:29 AEDT 2026
1
Mon Feb 9 15:16:30 AEDT 2026
1
Mon Feb 9 15:16:31 AEDT 2026
1
Mon Feb 9 15:16:32 AEDT 2026
1
Mon Feb 9 15:16:33 AEDT 2026
0
Mon Feb 9 15:16:34 AEDT 2026
0
Mon Feb 9 15:16:35 AEDT 2026
0
Mon Feb 9 15:16:36 AEDT 2026
0
Mon Feb 9 15:16:37 AEDT 2026
1
Mon Feb 9 15:16:38 AEDT 2026
1
Mon Feb 9 15:16:39 AEDT 2026
1
Mon Feb 9 15:16:40 AEDT 2026
1
Mon Feb 9 15:16:41 AEDT 2026
1
Mon Feb 9 15:16:42 AEDT 2026
1
Mon Feb 9 15:16:43 AEDT 2026
1
Mon Feb 9 15:16:44 AEDT 2026
1
Mon Feb 9 15:16:45 AEDT 2026
1
Mon Feb 9 15:16:46 AEDT 2026
1
Mon Feb 9 15:16:47 AEDT 2026
1
Mon Feb 9 15:16:48 AEDT 2026
1
Mon Feb 9 15:16:49 AEDT 2026
1
Mon Feb 9 15:16:50 AEDT 2026
1
Mon Feb 9 15:16:51 AEDT 2026
1
Mon Feb 9 15:16:52 AEDT 2026
0
Mon Feb 9 15:16:54 AEDT 2026
0
Mon Feb 9 15:16:55 AEDT 2026
0
Mon Feb 9 15:16:56 AEDT 2026
0
Mon Feb 9 15:16:57 AEDT 2026
1
Mon Feb 9 15:16:58 AEDT 2026
1
Mon Feb 9 15:16:59 AEDT 2026
1
Mon Feb 9 15:17:00 AEDT 2026
1
Mon Feb 9 15:17:01 AEDT 2026
1
Mon Feb 9 15:17:02 AEDT 2026
1
Mon Feb 9 15:17:03 AEDT 2026
1
Mon Feb 9 15:17:04 AEDT 2026
1
Mon Feb 9 15:17:05 AEDT 2026
1
Mon Feb 9 15:17:06 AEDT 2026
1
Mon Feb 9 15:17:07 AEDT 2026
1
Mon Feb 9 15:17:08 AEDT 2026
1
Mon Feb 9 15:17:09 AEDT 2026
1
Mon Feb 9 15:17:10 AEDT 2026
1
Mon Feb 9 15:17:11 AEDT 2026
1
Mon Feb 9 15:17:12 AEDT 2026
0
Mon Feb 9 15:17:13 AEDT 2026
0
Mon Feb 9 15:17:14 AEDT 2026
0
Mon Feb 9 15:17:15 AEDT 2026
1
Mon Feb 9 15:17:16 AEDT 2026
1
Mon Feb 9 15:17:17 AEDT 2026
1
Mon Feb 9 15:17:18 AEDT 2026
1
Mon Feb 9 15:17:19 AEDT 2026
1
Mon Feb 9 15:17:20 AEDT 2026
1
Mon Feb 9 15:17:21 AEDT 2026
1
Mon Feb 9 15:17:22 AEDT 2026
1
Mon Feb 9 15:17:23 AEDT 2026
1
Mon Feb 9 15:17:24 AEDT 2026
1
Mon Feb 9 15:17:25 AEDT 2026
1
Mon Feb 9 15:17:26 AEDT 2026
1
Mon Feb 9 15:17:27 AEDT 2026
1
Mon Feb 9 15:17:28 AEDT 2026
1
Mon Feb 9 15:17:29 AEDT 2026
1
Mon Feb 9 15:17:30 AEDT 2026
1
Mon Feb 9 15:17:31 AEDT 2026
0
Mon Feb 9 15:17:32 AEDT 2026
0
Mon Feb 9 15:17:33 AEDT 2026
0
Mon Feb 9 15:17:34 AEDT 2026
1
Mon Feb 9 15:17:35 AEDT 2026
1
Mon Feb 9 15:17:37 AEDT 2026
1
Mon Feb 9 15:17:38 AEDT 2026
1
Mon Feb 9 15:17:39 AEDT 2026
1
