Can't get internet connection

Installing and Using OpenWrt
#1

I installed openwrt (snapshot) on my TP-link MR6400 (4G LTE) V5 router a couple of days ago, before installing openwrt the router was working fine, but now I don't have internet access. I tried a suggested solution I found by changing the LAN IP address to a different range, it didn't work either. My networking background is not very strong, could anyone here help me find the problem?
This is a screenshot of the /etc/config/network file:

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I tried Ethernet&WIFI connection both of them did't have internet connection, I can ping other hosts in my network.

#2

Instead of screen shots, please post your results in pre-formatted text using the icon highlighted in red...

OpenWRT Posting Icons

Additionally, run cat /etc/config/dhcp and post.

#3

What is upstream of your openwrt router (i.e. what is between it and the internet)?

#4 
config dnsmasq
        option domainneeded '1'
        option boguspriv '1'
        option filterwin2k '0'
        option localise_queries '1'
        option rebind_protection '1'
        option rebind_localhost '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option nonegcache '0'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
        option nonwildcard '1'
        option localservice '1'
        option ednspacket_max '1232'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv4 'server'
        option dhcpv6 'server'
        option ra 'server'
        option ra_slaac '1'
        list ra_flags 'managed-config'
        list ra_flags 'other-config'

config dhcp 'wan'
        option interface 'wan'
        option ignore '1'

config odhcpd 'odhcpd'
        option maindhcp '0'
        option leasefile '/tmp/hosts/odhcpd'
        option leasetrigger '/usr/sbin/odhcpd-update'
        option loglevel '4'
#5

That does not appear to be the complete file. Maybe try again.

#6

fixed it, thanks

#7

i'm not sure if i understood you correctly but i'm using a 4G LTE router (SIM inserted in router) and my computer is connected to the router using Ethernet cable.

#8

Did you configure the LTE modem?

Currently it looks like the device is expecting the WAN on the ethernet ports.

#9

No i didn't. Mine is version 5 https://openwrt.org/toh/tp-link/tl-mr6400_v5

#10

I don't personally know how to get your LTE modem up and running (I haven't use that device), but I think fundamentally the system isn't firing that up -- it doesn't know it is available as a WAN connection.

#11

You might take a look at the User Guide...

#12

This might be useful: