How to find problem with Asus RT-N66U and Yota LTE?

Question

Yota

Good afternoon!
For a month now I have been trying to get the Internet working at home. The Internet works through the Yota LTE modem, the modem is connected to the Asus RT-N66U router,
which distributes the Internet via Ethernet and Wi-Fi. However, from time to time, problems with the Internet begin (not all requests are fulfilled, some sites open, some do not).
Here is the log from the router:

Jun  8 12:43:16 miniupnpd[24047]: Expired NAT-PMP mapping port 8787 UDP removed
Jun  8 12:43:16 miniupnpd[24047]: Expired NAT-PMP mapping port 8787 TCP removed
Jun  8 16:01:33 rc_service: hotplug 27177:notify_rc stop_rdnssd
Jun  8 16:01:33 rc_service: hotplug 27177:notify_rc stop_radvd
Jun  8 16:01:33 rc_service: waitting "stop_rdnssd" via hotplug ...
Jun  8 16:01:34 stop_wan(): perform DHCP release
Jun  8 16:01:37 WAN Connection: Ethernet link up.
Jun  8 16:01:37 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun  8 16:01:37 stop_wan(): perform DHCP release
Jun  8 16:01:45 WAN Connection: Ethernet link down.
Jun  8 16:01:45 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun  8 16:01:45 stop_wan(): perform DHCP release
Jun  8 16:01:48 rc_service: wanduck 314:notify_rc restart_wan_if 0
Jun  8 16:01:48 stop_wan(): perform DHCP release
Jun  8 16:01:48 kernel: Attempt to kill tasklet from interrupt
Jun  8 16:01:55 miniupnpd[24047]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  8 16:01:55 miniupnpd[24047]: Failed to get ip address for interface eth3
Jun  8 16:02:51 miniupnpd[24047]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  8 16:02:51 miniupnpd[24047]: Failed to get ip address for interface eth3
Jun  8 16:02:52 miniupnpd[24047]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  8 16:02:52 miniupnpd[24047]: Failed to get ip address for interface eth3
Jun  8 16:02:54 miniupnpd[24047]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  8 16:02:54 miniupnpd[24047]: Failed to get ip address for interface eth3
Jun  8 16:02:56 rc_service: wanduck 314:notify_rc restart_wan_if 0
Jun  8 16:02:56 stop_wan(): perform DHCP release
Jun  8 16:02:56 kernel: Attempt to kill tasklet from interrupt
Jun  8 16:02:58 miniupnpd[24047]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  8 16:02:58 miniupnpd[24047]: Failed to get ip address for interface eth3
Jun  8 16:03:00 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun  8 16:03:00 stop_wan(): perform DHCP release
Jun  8 16:03:03 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth3_eth3)!
Jun  8 16:03:03 rc_service: udhcpc 27283:notify_rc stop_upnp
Jun  8 16:03:03 miniupnpd[24047]: received signal 15, good-bye
Jun  8 16:03:03 rc_service: udhcpc 27283:notify_rc start_upnp
Jun  8 16:03:03 miniupnpd[27312]: HTTP listening on port 51238
Jun  8 16:03:03 miniupnpd[27312]: Listening for NAT-PMP traffic on port 5351
Jun  8 16:03:03 dhcp client: bound 10.0.0.10 via 10.0.0.1 during 604800 seconds.
Jun  8 16:03:08 WAN Connection: WAN was restored.
Jun  8 16:03:11 miniupnpd[27312]: HTTP Connection from 192.168.1.183 closed unexpectedly
Jun  8 17:21:13 miniupnpd[27312]: Expired NAT-PMP mapping port 8787 UDP removed
Jun  8 17:21:14 miniupnpd[27312]: Expired NAT-PMP mapping port 8787 TCP removed
Jun  8 19:10:11 kernel: nf_ct_ras: decoding error: out of range
Jun  8 20:45:56 rc_service: httpd 328:notify_rc start_webs_update
Jun  8 20:49:28 rc_service: httpd 328:notify_rc start_webs_update
Jun  8 21:53:10 miniupnpd[27312]: Expired NAT-PMP mapping port 8787 UDP removed
Jun  8 21:53:10 miniupnpd[27312]: Expired NAT-PMP mapping port 8787 TCP removed
Jun  8 23:50:44 miniupnpd[27312]: Expired NAT-PMP mapping port 8787 UDP removed
Jun  8 23:50:44 miniupnpd[27312]: Expired NAT-PMP mapping port 8787 TCP removed
Jun  9 02:05:11 kernel: nf_ct_ras: decoding error: out of range
Jun  9 15:00:23 miniupnpd[27312]: Expired NAT-PMP mapping port 8787 UDP removed
Jun  9 15:00:23 miniupnpd[27312]: Expired NAT-PMP mapping port 8787 TCP removed
Jun  9 16:07:14 rc_service: hotplug 30533:notify_rc stop_rdnssd
Jun  9 16:07:14 rc_service: hotplug 30533:notify_rc stop_radvd
Jun  9 16:07:14 rc_service: waitting "stop_rdnssd" via hotplug ...
Jun  9 16:07:15 stop_wan(): perform DHCP release
Jun  9 16:07:16 WAN Connection: Fail to connect with some issues.
Jun  9 16:07:16 stop_nat_rules: apply the redirect_rules!
Jun  9 16:07:21 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun  9 16:07:21 stop_wan(): perform DHCP release
Jun  9 16:07:25 rc_service: wanduck 314:notify_rc restart_wan_if 0
Jun  9 16:07:25 stop_wan(): perform DHCP release
Jun  9 16:07:25 kernel: Attempt to kill tasklet from interrupt
Jun  9 16:08:05 miniupnpd[27312]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  9 16:08:05 miniupnpd[27312]: Failed to get ip address for interface eth3
Jun  9 16:08:06 miniupnpd[27312]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  9 16:08:06 miniupnpd[27312]: Failed to get ip address for interface eth3
Jun  9 16:08:08 miniupnpd[27312]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  9 16:08:08 miniupnpd[27312]: Failed to get ip address for interface eth3
Jun  9 16:08:12 miniupnpd[27312]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  9 16:08:12 miniupnpd[27312]: Failed to get ip address for interface eth3
Jun  9 16:08:20 miniupnpd[27312]: ioctl(s, SIOCGIFADDR, ...): Cannot assign requested address
Jun  9 16:08:20 miniupnpd[27312]: Failed to get ip address for interface eth3
Jun  9 16:08:29 rc_service: wanduck 314:notify_rc restart_wan_if 0
Jun  9 16:08:29 stop_wan(): perform DHCP release
Jun  9 16:08:29 kernel: Attempt to kill tasklet from interrupt
Jun  9 16:08:33 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun  9 16:08:33 stop_wan(): perform DHCP release
Jun  9 16:08:36 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth3_eth3)!
Jun  9 16:08:36 rc_service: udhcpc 30642:notify_rc stop_upnp
Jun  9 16:08:36 miniupnpd[27312]: received signal 15, good-bye
Jun  9 16:08:36 rc_service: udhcpc 30642:notify_rc start_upnp
Jun  9 16:08:36 miniupnpd[30671]: HTTP listening on port 36271
Jun  9 16:08:36 miniupnpd[30671]: Listening for NAT-PMP traffic on port 5351
Jun  9 16:08:36 WAN Connection: WAN was restored.
Jun  9 16:08:36 dhcp client: bound 10.0.0.10 via 10.0.0.1 during 604800 seconds.
Jun  9 20:16:28 kernel: nf_ct_ras: decoding error: out of range
Jun 10 10:29:08 kernel: nf_ct_ras: decoding error: out of range
Jun 10 16:12:57 rc_service: hotplug 1351:notify_rc stop_rdnssd
Jun 10 16:12:57 rc_service: hotplug 1351:notify_rc stop_radvd
Jun 10 16:12:57 stop_wan(): perform DHCP release
Jun 10 16:12:59 WAN Connection: Fail to connect with some issues.
Jun 10 16:12:59 stop_nat_rules: apply the redirect_rules!
Jun 10 16:13:04 WAN Connection: Ethernet link up.
Jun 10 16:13:04 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun 10 16:13:04 stop_wan(): perform DHCP release
Jun 10 16:13:11 WAN Connection: Ethernet link up.
Jun 10 16:13:11 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun 10 16:13:11 stop_wan(): perform DHCP release
Jun 10 16:13:14 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth3_eth3)!
Jun 10 16:13:14 rc_service: udhcpc 1449:notify_rc stop_upnp
Jun 10 16:13:14 miniupnpd[30671]: received signal 15, good-bye
Jun 10 16:13:14 rc_service: udhcpc 1449:notify_rc start_upnp
Jun 10 16:13:14 dhcp client: bound 10.0.0.10 via 10.0.0.1 during 604800 seconds.
Jun 10 16:13:14 miniupnpd[1478]: HTTP listening on port 44672
Jun 10 16:13:14 miniupnpd[1478]: Listening for NAT-PMP traffic on port 5351
Jun 10 16:13:19 WAN Connection: WAN was restored.
Jun 10 21:11:42 miniupnpd[1478]: Expired NAT-PMP mapping port 8787 UDP removed
Jun 10 21:11:42 miniupnpd[1478]: Expired NAT-PMP mapping port 8787 TCP removed
Jun 11 12:38:30 miniupnpd[1478]: Expired NAT-PMP mapping port 8787 UDP removed
Jun 11 12:38:30 miniupnpd[1478]: Expired NAT-PMP mapping port 8787 TCP removed
Jun 11 16:10:55 miniupnpd[1478]: Expired NAT-PMP mapping port 8787 UDP removed
Jun 11 16:10:55 miniupnpd[1478]: Expired NAT-PMP mapping port 8787 TCP removed
Jun 11 16:18:37 rc_service: hotplug 4603:notify_rc stop_rdnssd
Jun 11 16:18:37 rc_service: hotplug 4603:notify_rc stop_radvd
Jun 11 16:18:38 stop_wan(): perform DHCP release
Jun 11 16:18:38 WAN Connection: Fail to connect with some issues.
Jun 11 16:18:38 stop_nat_rules: apply the redirect_rules!
Jun 11 16:18:44 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun 11 16:18:44 stop_wan(): perform DHCP release
Jun 11 16:18:47 rc_service: wanduck 314:notify_rc restart_wan_if 0
Jun 11 16:18:47 stop_wan(): perform DHCP release
Jun 11 16:18:47 kernel: Attempt to kill tasklet from interrupt
Jun 11 16:19:52 rc_service: wanduck 314:notify_rc restart_wan_if 0
Jun 11 16:19:52 stop_wan(): perform DHCP release
Jun 11 16:19:52 kernel: Attempt to kill tasklet from interrupt
Jun 11 16:19:56 rc_service: wanduck 314:notify_rc restart_wan_if 1
Jun 11 16:19:56 stop_wan(): perform DHCP release
Jun 11 16:19:59 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth3_eth3)!
Jun 11 16:19:59 rc_service: udhcpc 4709:notify_rc stop_upnp
Jun 11 16:19:59 miniupnpd[1478]: received signal 15, good-bye
Jun 11 16:19:59 rc_service: udhcpc 4709:notify_rc start_upnp
Jun 11 16:19:59 dhcp client: bound 10.0.0.10 via 10.0.0.1 during 604800 seconds.
Jun 11 16:19:59 miniupnpd[4738]: HTTP listening on port 36928
Jun 11 16:19:59 miniupnpd[4738]: Listening for NAT-PMP traffic on port 5351
Jun 11 16:19:59 WAN Connection: WAN was restored.
Jun 12 00:23:51 miniupnpd[4738]: unsupported NAT-PMP version : 2
Jun 12 13:05:54 rc_service: httpd 328:notify_rc start_webs_update

What could be the problem? Is she on the router? Or in yota?
Also, a second router for distributing Wi-Fi Asus EA-N66 is connected via Ethernet via a TEG-S24g switch, but sometimes it falls off and the Internet stops working at all (is this normal? How to determine why this happens?).

Answer 1

Faced a similar problem. Most likely it's the MTU values. Apparently, either the modem itself or what is behind the modem (on the side of the eta) does not pass packets of length 1500.
Alternatively, try reducing the MTU value for the modem (I did not succeed through the web interface, there is simply no such setting).
I connected via telnet and added a rule to the router
Here is a more detailed article on the topic , read the comments, there are examples of other rules.