No internet after fresh install (modem, R7800)

Installing and Using OpenWrt
1

Friends,

I have a fresh install of OpenWrt 24.10.0 (r28427-6df0e3d02a) on a Netgear R7800. Previously I had an older version on the same device but it mysteriously stopped working. One thing led to another and I decided to start over with the latest and greatest.

Now I do not have internet access. In fact, my Netgear cannot seem to communicate with my Motorola MB7420 at all. Whether from Luci or ssh, ping 8.8.8.8 or 192.168.100.1 (my cable modem) returns "Network unreachable."

There is an ethernet cable from the Netgear "Internet" port to the only ethernet port on the cable modem. (This is way I've always had it.) The status lights look good. I've tried 2 known-good cables.

I enabled wireless on my router after installation. Both Wifi and ethernet connections to the router work fine.

The only manual change I made after installation was to set the gateway and DNS addresses on the Netgear to 192.168.100.1, which is my Motorola modem. It did not help.

Here is my network config.

root@OpenWrt:~# cat /etc/config/network

config interface 'loopback'
option device 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'

config globals 'globals'
option ula_prefix 'fdd6:34d2:1f3f::/48'
option packet_steering '1'

config device
option name 'br-lan'
option type 'bridge'
list ports 'lan1'
list ports 'lan2'
list ports 'lan3'
list ports 'lan4'

config interface 'lan'
option device 'br-lan'
option proto 'static'
option ipaddr '192.168.1.1'
option netmask '255.255.255.0'
option ip6assign '60'
option gateway '192.168.100.1'
option dns '192.168.100.1'

config interface 'wan'
option device 'wan'
option proto 'dhcp'

config interface 'wan6'
option device 'wan'
option proto 'dhcpv6'

What should I try next?

thanks

2

That sounds wrong.
Typically the docsis modems have that address just for modem admin interface, not meant to be configured as router's upstream.

It might just be that your modem locks into the router's MAC. You might need to disconnect power from modem for an hour to get it to forget the old router's MAC and to start working with the new router.

1 Like
3

Thanks! I removed the dns and gateway entries, restarted the network service, and turned the modem off for about 90 minutes. Now it works.

4

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