How-to debug problems?

[ruig]

Hello!

For a couple of days I installed 380.63_2 on my RT-N66U.
I am also using Huawei E3372h-153 (usb modem mode / no-hilink).
Usb modem is not listed in admin panel as official supported but works fine (LTE speed according my carrier subscription).

But.
From time to time clients cannot open any webpage anymore ("resolving host..." and following "connection error"). Ping, traceroute etc... nothing works. Router must be restarted.


I tried to check the state via SSH but could not find anything suspicious.

#route -n... default gateway set to 10.64.64.64 ppp0
#top... OK
#free -tm.. OK

but #ping / #traceroute doesn't work (no connection).


Is there any advanced possibility to check what is wrong? Any logs?

Thanks.

 

[thelonelycoder]

The Syslog shows no entries? USB errors or timeouts with your ISP?

 

[ruig]

Many thanks! A lot of stuff in /tmp/* directory.

In my case I found this syslog entry:
Dec 12 00:22:01 dnsmasq[224]: Maximum number of concurrent DNS queries reached (max: 150)

I will try solution described here:
http://www.snbforums.com/threads/ac66u-on-45-maximum-number-of-dns-queries-reached-150.19304/