WAN Disconnections ASUS RT-AX86U Pro

[SteevieWeevie]

I recently upgraded to an AX86U Pro which is running up to date Merlin firmware. There are occasional WAN drops. I don't think these are necessarily related to the router itself as they occurred with the previous one as well, AC68U, but does anyone have any suggestions on the cause of them and a potential fix? I have posted excerpts from the event log where it's happened. You can see from this that the disconnection only lasts a matter of seconds. With the previous router, this was minutes but I guess the faster processer in the new router mitigates this to a degree. My ISP provides a static IP address - I don't know if that is of any relevance.

Sep 3 22:46:41 pppd[2473]: Serial link appears to be disconnected.
Sep 3 22:46:41 wsdd2[18620]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Sep 3 22:46:42 WAN_Connection: Fail to connect with some issues.
Sep 3 22:46:47 pppd[2473]: Connection terminated.
Sep 3 22:46:47 pppd[2473]: Modem hangup
Sep 3 22:46:57 pppd[2473]: Connected to f8:13:08:40:d7:16 via interface eth0
Sep 3 22:46:57 pppd[2473]: Connect: ppp0 <--> eth0
Sep 3 22:46:57 pppd[2473]: CHAP authentication succeeded
Sep 3 22:46:57 pppd[2473]: peer from calling number F8:13:08:407:16 authorized
Sep 3 22:46:57 wsdd2[18620]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Sep 3 22:46:57 pppd[2473]: local IP address xxxxxxxxxxxx
Sep 3 22:46:57 pppd[2473]: remote IP address xxxxxxxxxxxx
Sep 3 22:46:57 wsdd2[18620]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Sep 3 22:46:57 wan: finish adding multi routes
Sep 3 22:47:00 BWDPI: force to flush flowcache entries
Sep 3 22:47:00 kernel: udb_core lock_num = 183
Sep 3 22:47:00 BWDPI: rollback fc
Sep 3 22:47:01 wlceventd: wlceventd_proc_event(645): eth6: Deauth_ind 1C:FE:2B:05:44:E2, status: 0, reason: Unspecified reason (1), rssi:-48
Sep 3 22:47:01 wlceventd: wlceventd_proc_event(685): eth6: Auth 1C:FE:2B:05:44:E2, status: Successful (0), rssi:-48
Sep 3 22:47:01 wlceventd: wlceventd_proc_event(722): eth6: Assoc 1C:FE:2B:05:44:E2, status: Successful (0), rssi:-48
Sep 3 22:47:02 WAN_Connection: WAN was restored.

Sep 8 22:48:45 pppd[2473]: Serial link appears to be disconnected.
Sep 8 22:48:45 wsdd2[30321]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Sep 8 22:48:46 WAN_Connection: Fail to connect with some issues.
Sep 8 22:48:51 pppd[2473]: Connection terminated.
Sep 8 22:48:51 pppd[2473]: Modem hangup
Sep 8 22:48:57 wlceventd: wlceventd_proc_event(645): eth6: Deauth_ind 1C:FE:2B:05:44:E2, status: 0, reason: Unspecified reason (1), rssi:-49
Sep 8 22:48:57 wlceventd: wlceventd_proc_event(685): eth6: Auth 1C:FE:2B:05:44:E2, status: Successful (0), rssi:-49
Sep 8 22:48:57 wlceventd: wlceventd_proc_event(722): eth6: Assoc 1C:FE:2B:05:44:E2, status: Successful (0), rssi:-49
Sep 8 22:49:01 pppd[2473]: Connected to f8:13:08:40:d7:16 via interface eth0
Sep 8 22:49:01 pppd[2473]: Connect: ppp0 <--> eth0
Sep 8 22:49:01 pppd[2473]: CHAP authentication succeeded
Sep 8 22:49:01 pppd[2473]: peer from calling number F8:13:08:407:16 authorized
Sep 8 22:49:01 wsdd2[30321]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Sep 8 22:49:01 pppd[2473]: local IP address xxxxxxxxxxx
Sep 8 22:49:01 pppd[2473]: remote IP address xxxxxxxxxxxx
Sep 8 22:49:01 wsdd2[30321]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Sep 8 22:49:02 wan: finish adding multi routes
Sep 8 22:49:04 BWDPI: force to flush flowcache entries
Sep 8 22:49:04 kernel: udb_core lock_num = 56
Sep 8 22:49:04 BWDPI: rollback fc
Sep 8 22:49:06 WAN_Connection: WAN was restored.

Oct 5 15:49:05 pppd[2473]: Serial link appears to be disconnected.
Oct 5 15:49:05 wsdd2[16690]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Oct 5 15:49:06 WAN_Connection: Fail to connect with some issues.
Oct 5 15:49:11 pppd[2473]: Connection terminated.
Oct 5 15:49:11 pppd[2473]: Modem hangup
Oct 5 15:49:15 wlceventd: wlceventd_proc_event(645): eth6: Deauth_ind 1C:FE:2B:05:44:E2, status: 0, reason: Unspecified reason (1), rssi:0
Oct 5 15:49:15 wlceventd: wlceventd_proc_event(685): eth6: Auth 1C:FE:2B:05:44:E2, status: Successful (0), rssi:-47
Oct 5 15:49:15 wlceventd: wlceventd_proc_event(722): eth6: Assoc 1C:FE:2B:05:44:E2, status: Successful (0), rssi:-47
Oct 5 15:49:26 pppd[2473]: Connected to f8:13:08:40:d7:16 via interface eth0
Oct 5 15:49:26 pppd[2473]: Connect: ppp0 <--> eth0
Oct 5 15:49:26 pppd[2473]: CHAP authentication succeeded
Oct 5 15:49:26 pppd[2473]: peer from calling number F8:13:08:407:16 authorized
Oct 5 15:49:26 wsdd2[16690]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Oct 5 15:49:26 pppd[2473]: local IP address xxxxxxxxxxxx
Oct 5 15:49:26 pppd[2473]: remote IP address xxxxxxxxxxxx
Oct 5 15:49:26 wsdd2[16690]: error: wsdd-mcast-v4: wsd_send_soap_msg: send
Oct 5 15:49:26 wan: finish adding multi routes
Oct 5 15:49:29 BWDPI: force to flush flowcache entries
Oct 5 15:49:29 kernel: path_push_stats_clear: Invalid netdevice dev_p=0000000037f0699f
Oct 5 15:49:29 kernel: udb_core lock_num = 295
Oct 5 15:49:29 BWDPI: rollback fc
Oct 5 15:49:31 WAN_Connection: WAN was restored.

 

[bennor]

What ISP equipment is the RT-AX86U Pro's WAN port connected to? A router, or ONT, or something else? If you are getting WAN drops across different routers check that upstream ISP equipment. Also which port, 1GB or the 2.5GB port, is the RT-AX86U Pro configured to use for it's WAN port?

 

[SteevieWeevie]

My ISP is Zen UK and the Asus is connected to an Openreach SKU of Huawei MT992 G.fast modem. When the disconnect happens nothing appears different with the modem's status LEDs, e.g., it doesn't show an internet disconnect or a reset etc.

The Huawei is connected to the Asus into the standard WAN port on the Asus. The connection max bandwidth is 330Mbps.

 

[bennor]

My ISP is Zen UK and the Asus is connected to an Openreach SKU of Huawei MT992 G.fast modem.

Access the Huawei's administration page and see if there is a log you can review to see if the modem or broadband connection is going offline at the same time the router is indicating the WAN connection going offline. If you don't know how to access the Huawei MT992's admin interface, see the user manual for the MT992 which should explain how to access it.

Edit to add: You may also have to search Huawei support forums to see if the MT992 needs any additional configuration when a down stream customer purchased router like an Asus is used. Or if the downstream Asus router needs any specific configuration adjustments.

 

[Lynx]

@SteevieWeevie I developed this:

GitHub - lynxthecat/maintain-wan-lease: Resolve problem with Asus Merlin routers in terms of release/renew of udhcpc.

Resolve problem with Asus Merlin routers in terms of release/renew of udhcpc. - lynxthecat/maintain-wan-lease

github.com

to maintain connection when connected with Huawei B818-263 in bridge mode.