Internet not stable

Installing and Using OpenWrt
1

Hi,

I just switched my ISP router to an Archer C7 v5 and changed the firmware to OpenWrt, however, ever since I changed the router, the internet hasn't been stable.
Sometimes it briefly stops working for 10-30 seconds and I see the following info in the system log:

Wed Dec  2 14:29:47 2020 daemon.info hostapd: wlan1: STA 58:20:59:8e:98:94 WPA: pairwise key handshake completed (RSN)
Wed Dec  2 14:29:47 2020 daemon.info dnsmasq-dhcp[2047]: DHCPDISCOVER(br-lan) 58:20:59:8e:98:94
Wed Dec  2 14:29:47 2020 daemon.info dnsmasq-dhcp[2047]: DHCPOFFER(br-lan) 192.168.1.171 58:20:59:8e:98:94
Wed Dec  2 14:29:47 2020 daemon.info dnsmasq-dhcp[2047]: DHCPREQUEST(br-lan) 192.168.1.171 58:20:59:8e:98:94
Wed Dec  2 14:29:47 2020 daemon.info dnsmasq-dhcp[2047]: DHCPACK(br-lan) 192.168.1.171 58:20:59:8e:98:94 Mi10-MiKeitai
Wed Dec  2 14:29:48 2020 daemon.warn odhcpd[1346]: A default route is present but there is no public prefix on lan thus we don't announce a default route!
Wed Dec  2 14:30:51 2020 daemon.warn odhcpd[1346]: A default route is present but there is no public prefix on lan thus we don't announce a default route!
Wed Dec  2 14:32:29 2020 user.info mwan3track[30301]: Check (ping) failed for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:32:31 2020 user.info mwan3track[30301]: Check (ping) failed for target "208.67.222.222" on interface wan (eth0.2)
Wed Dec  2 14:32:33 2020 user.info mwan3track[30301]: Check (ping) failed for target "208.67.220.220" on interface wan (eth0.2)
Wed Dec  2 14:32:40 2020 user.info mwan3track[30301]: Check (ping) failed for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:32:42 2020 user.info mwan3track[30301]: Check (ping) failed for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:32:44 2020 user.info mwan3track[30301]: Check (ping) failed for target "208.67.222.222" on interface wan (eth0.2)
Wed Dec  2 14:32:46 2020 user.info mwan3track[30301]: Check (ping) failed for target "208.67.220.220" on interface wan (eth0.2)
Wed Dec  2 14:32:51 2020 daemon.err uhttpd[1455]: luci: accepted login on / for root from 192.168.1.105
Wed Dec  2 14:32:53 2020 user.info mwan3track[30301]: Check (ping) failed for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:32:55 2020 user.info mwan3track[30301]: Check (ping) failed for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:32:57 2020 user.info mwan3track[30301]: Check (ping) failed for target "208.67.220.220" on interface wan (eth0.2)
Wed Dec  2 14:32:59 2020 user.notice mwan3[29728]: Execute ifdown event on interface wan (eth0.2)
Wed Dec  2 14:33:03 2020 user.info mwan3track[30301]: Detect ifdown event on interface wan (eth0.2)
Wed Dec  2 14:33:09 2020 user.notice mwan3track[30301]: Interface wan (eth0.2) is offline
Wed Dec  2 14:33:09 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:33:10 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:33:10 2020 user.info mwan3track[30301]: Lost 10 ping(s) on interface wan (eth0.2)
Wed Dec  2 14:33:15 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:33:15 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:33:20 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:33:20 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:33:25 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:33:25 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:33:30 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:33:30 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:33:35 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:33:36 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:33:41 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:33:41 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:33:46 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.4.4" on interface wan (eth0.2)
Wed Dec  2 14:33:46 2020 user.info mwan3track[30301]: Check (ping) success for target "8.8.8.8" on interface wan (eth0.2)
Wed Dec  2 14:33:46 2020 user.notice mwan3track[30301]: Interface wan (eth0.2) is online
Wed Dec  2 14:33:47 2020 user.notice mwan3[32493]: Execute ifup event on interface wan (eth0.2)
Wed Dec  2 14:33:47 2020 user.notice mwan3[32493]: Starting tracker on interface wan (eth0.2)
Wed Dec  2 14:33:53 2020 user.info mwan3rtmon[2122]: Detect rtchange event.
Wed Dec  2 14:33:54 2020 user.notice firewall: Reloading firewall due to ifup of wan (eth0.2)

Hostname	OpenWrt
Model	TP-Link Archer C7 v5
Architecture	Qualcomm Atheros QCA956X ver 1 rev 0
Firmware Version	OpenWrt 19.07.4 r11208-ce6496d796 / LuCI openwrt-19.07 branch git-20.325.64304-92c01e2
Kernel Version	4.14.195
Local Time	2020-12-02 14:37:24
Uptime	16h 14m 53s
Load Average	1.79, 0.81, 0.35

Any idea how I can troubleshoot this?

Thanks a lot in advance for the help!

2

do you have two or more isp? you are running mwan3.

3

Thanks for the reply.
I only have one ISP.

Screenshot_30
Screenshot_301059×530 68.7 KB

4

not sure but i see that in your log

5

How can I disable the unused WAN? (the router only has one slot though..)

6

you should post your config, also have you installed packages? i see that you are using ipv4 and ipv6 on your wan. with no config only you know about that.
about your ISP, so other users that have same provider can help you.

8

How can I export my config? I can't seem to find it in the documentation (i'm using the GUI)

My ISP is: Telenet, Belgium

9

If you only have a single WAN uplink, mwan3 is not needed and adds a significant complication to the configuration. I'd suggest to do a factory reset (firstboot) and start over with a simple configuration (and without installing additional packages you don't strictly need).